diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index d3b1112f4..cf27a179f 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 1.24.9-wip
+
 ## 1.24.8
 
 * Remove spurious deprecation during autocomplete for `setUp` and `tearDown`.
diff --git a/pkgs/test/lib/src/runner/browser/dom.dart b/pkgs/test/lib/src/runner/browser/dom.dart
index 37f061282..21b41feae 100644
--- a/pkgs/test/lib/src/runner/browser/dom.dart
+++ b/pkgs/test/lib/src/runner/browser/dom.dart
@@ -161,6 +161,21 @@ extension MessageEventExtension on MessageEvent {
 @staticInterop
 class MessageEventSource {}
 
+extension MessageEventSourceExtension on MessageEventSource {
+  @pragma('dart2js:as:trust')
+  MessageEventSourceLocation? get location =>
+      js_util.getProperty<dynamic>(this, 'location')
+          as MessageEventSourceLocation;
+}
+
+@JS()
+@staticInterop
+class MessageEventSourceLocation {}
+
+extension MessageEventSourceLocationExtension on MessageEventSourceLocation {
+  external String? get href;
+}
+
 @JS()
 @staticInterop
 class Location {}
diff --git a/pkgs/test/lib/src/runner/browser/static/host.dart.js b/pkgs/test/lib/src/runner/browser/static/host.dart.js
index 3cf97e5de..fd3ef3835 100644
--- a/pkgs/test/lib/src/runner/browser/static/host.dart.js
+++ b/pkgs/test/lib/src/runner/browser/static/host.dart.js
@@ -1,4 +1,4 @@
-// Generated by dart2js (NullSafetyMode.sound, csp, intern-composite-values), the Dart to JavaScript compiler version: 3.2.0-134.0.dev.
+// Generated by dart2js (NullSafetyMode.sound, csp, intern-composite-values), the Dart to JavaScript compiler version: 3.2.0-228.0.dev.
 // The code supports the following hooks:
 // dartPrint(message):
 //    if this function is defined it is called instead of the Dart [print]
@@ -236,85 +236,463 @@
     typesOffset = init.types.length;
     hunk(hunkHelpers, init, holders, $);
   }
-  var A = {JS_CONST: function JS_CONST() {
+  var J = {
+    makeDispatchRecord(interceptor, proto, extension, indexability) {
+      return {i: interceptor, p: proto, e: extension, x: indexability};
     },
-    CastIterable_CastIterable(source, $S, $T) {
-      if ($S._eval$1("EfficientLengthIterable<0>")._is(source))
-        return new A._EfficientLengthCastIterable(source, $S._eval$1("@<0>")._bind$1($T)._eval$1("_EfficientLengthCastIterable<1,2>"));
-      return new A.CastIterable(source, $S._eval$1("@<0>")._bind$1($T)._eval$1("CastIterable<1,2>"));
+    getNativeInterceptor(object) {
+      var proto, objectProto, $constructor, interceptor, t1,
+        record = object[init.dispatchPropertyName];
+      if (record == null)
+        if ($.initNativeDispatchFlag == null) {
+          A.initNativeDispatch();
+          record = object[init.dispatchPropertyName];
+        }
+      if (record != null) {
+        proto = record.p;
+        if (false === proto)
+          return record.i;
+        if (true === proto)
+          return object;
+        objectProto = Object.getPrototypeOf(object);
+        if (proto === objectProto)
+          return record.i;
+        if (record.e === objectProto)
+          throw A.wrapException(A.UnimplementedError$("Return interceptor for " + A.S(proto(object, record))));
+      }
+      $constructor = object.constructor;
+      if ($constructor == null)
+        interceptor = null;
+      else {
+        t1 = $._JS_INTEROP_INTERCEPTOR_TAG;
+        if (t1 == null)
+          t1 = $._JS_INTEROP_INTERCEPTOR_TAG = init.getIsolateTag("_$dart_js");
+        interceptor = $constructor[t1];
+      }
+      if (interceptor != null)
+        return interceptor;
+      interceptor = A.lookupAndCacheInterceptor(object);
+      if (interceptor != null)
+        return interceptor;
+      if (typeof object == "function")
+        return B.JavaScriptFunction_methods;
+      proto = Object.getPrototypeOf(object);
+      if (proto == null)
+        return B.PlainJavaScriptObject_methods;
+      if (proto === Object.prototype)
+        return B.PlainJavaScriptObject_methods;
+      if (typeof $constructor == "function") {
+        t1 = $._JS_INTEROP_INTERCEPTOR_TAG;
+        if (t1 == null)
+          t1 = $._JS_INTEROP_INTERCEPTOR_TAG = init.getIsolateTag("_$dart_js");
+        Object.defineProperty($constructor, t1, {value: B.UnknownJavaScriptObject_methods, enumerable: false, writable: true, configurable: true});
+        return B.UnknownJavaScriptObject_methods;
+      }
+      return B.UnknownJavaScriptObject_methods;
     },
-    hexDigitValue(char) {
-      var letter,
-        digit = char ^ 48;
-      if (digit <= 9)
-        return digit;
-      letter = char | 32;
-      if (97 <= letter && letter <= 102)
-        return letter - 87;
-      return -1;
+    JSArray_JSArray$fixed($length, $E) {
+      if ($length < 0 || $length > 4294967295)
+        throw A.wrapException(A.RangeError$range($length, 0, 4294967295, "length", null));
+      return J.JSArray_JSArray$markFixed(new Array($length), $E);
     },
-    SystemHash_combine(hash, value) {
-      hash = hash + value & 536870911;
-      hash = hash + ((hash & 524287) << 10) & 536870911;
-      return hash ^ hash >>> 6;
+    JSArray_JSArray$growable($length, $E) {
+      if ($length < 0)
+        throw A.wrapException(A.ArgumentError$("Length must be a non-negative integer: " + $length, null));
+      return A._setArrayType(new Array($length), $E._eval$1("JSArray<0>"));
     },
-    SystemHash_finish(hash) {
-      hash = hash + ((hash & 67108863) << 3) & 536870911;
-      hash ^= hash >>> 11;
-      return hash + ((hash & 16383) << 15) & 536870911;
+    JSArray_JSArray$markFixed(allocation, $E) {
+      return J.JSArray_markFixedList(A._setArrayType(allocation, $E._eval$1("JSArray<0>")), $E);
     },
-    checkNotNullable(value, $name, $T) {
-      return value;
+    JSArray_markFixedList(list, $T) {
+      list.fixed$length = Array;
+      return list;
     },
-    isToStringVisiting(object) {
-      var t1, i;
-      for (t1 = $.toStringVisiting.length, i = 0; i < t1; ++i)
-        if (object === $.toStringVisiting[i])
+    JSArray_markUnmodifiableList(list) {
+      list.fixed$length = Array;
+      list.immutable$list = Array;
+      return list;
+    },
+    JSString__isWhitespace(codeUnit) {
+      if (codeUnit < 256)
+        switch (codeUnit) {
+          case 9:
+          case 10:
+          case 11:
+          case 12:
+          case 13:
+          case 32:
+          case 133:
+          case 160:
+            return true;
+          default:
+            return false;
+        }
+      switch (codeUnit) {
+        case 5760:
+        case 8192:
+        case 8193:
+        case 8194:
+        case 8195:
+        case 8196:
+        case 8197:
+        case 8198:
+        case 8199:
+        case 8200:
+        case 8201:
+        case 8202:
+        case 8232:
+        case 8233:
+        case 8239:
+        case 8287:
+        case 12288:
+        case 65279:
           return true;
-      return false;
+        default:
+          return false;
+      }
     },
-    SubListIterable$(_iterable, _start, _endOrLength, $E) {
-      A.RangeError_checkNotNegative(_start, "start");
-      if (_endOrLength != null) {
-        A.RangeError_checkNotNegative(_endOrLength, "end");
-        if (_start > _endOrLength)
-          A.throwExpression(A.RangeError$range(_start, 0, _endOrLength, "start", null));
+    JSString__skipLeadingWhitespace(string, index) {
+      var t1, codeUnit;
+      for (t1 = string.length; index < t1;) {
+        codeUnit = string.charCodeAt(index);
+        if (codeUnit !== 32 && codeUnit !== 13 && !J.JSString__isWhitespace(codeUnit))
+          break;
+        ++index;
       }
-      return new A.SubListIterable(_iterable, _start, _endOrLength, $E._eval$1("SubListIterable<0>"));
+      return index;
     },
-    MappedIterable_MappedIterable(iterable, $function, $S, $T) {
-      if (type$.EfficientLengthIterable_dynamic._is(iterable))
-        return new A.EfficientLengthMappedIterable(iterable, $function, $S._eval$1("@<0>")._bind$1($T)._eval$1("EfficientLengthMappedIterable<1,2>"));
-      return new A.MappedIterable(iterable, $function, $S._eval$1("@<0>")._bind$1($T)._eval$1("MappedIterable<1,2>"));
+    JSString__skipTrailingWhitespace(string, index) {
+      var t1, index0, codeUnit;
+      for (t1 = string.length; index > 0; index = index0) {
+        index0 = index - 1;
+        if (!(index0 < t1))
+          return A.ioore(string, index0);
+        codeUnit = string.charCodeAt(index0);
+        if (codeUnit !== 32 && codeUnit !== 13 && !J.JSString__isWhitespace(codeUnit))
+          break;
+      }
+      return index;
     },
-    TakeIterable_TakeIterable(iterable, takeCount, $E) {
-      var _s9_ = "takeCount";
-      A.ArgumentError_checkNotNull(takeCount, _s9_, type$.int);
-      A.RangeError_checkNotNegative(takeCount, _s9_);
-      if (type$.EfficientLengthIterable_dynamic._is(iterable))
-        return new A.EfficientLengthTakeIterable(iterable, takeCount, $E._eval$1("EfficientLengthTakeIterable<0>"));
-      return new A.TakeIterable(iterable, takeCount, $E._eval$1("TakeIterable<0>"));
+    getInterceptor$(receiver) {
+      if (typeof receiver == "number") {
+        if (Math.floor(receiver) == receiver)
+          return J.JSInt.prototype;
+        return J.JSNumNotInt.prototype;
+      }
+      if (typeof receiver == "string")
+        return J.JSString.prototype;
+      if (receiver == null)
+        return J.JSNull.prototype;
+      if (typeof receiver == "boolean")
+        return J.JSBool.prototype;
+      if (Array.isArray(receiver))
+        return J.JSArray.prototype;
+      if (typeof receiver != "object") {
+        if (typeof receiver == "function")
+          return J.JavaScriptFunction.prototype;
+        if (typeof receiver == "symbol")
+          return J.JavaScriptSymbol.prototype;
+        if (typeof receiver == "bigint")
+          return J.JavaScriptBigInt.prototype;
+        return receiver;
+      }
+      if (receiver instanceof A.Object)
+        return receiver;
+      return J.getNativeInterceptor(receiver);
     },
-    SkipIterable_SkipIterable(iterable, count, $E) {
-      var _s5_ = "count";
-      if (type$.EfficientLengthIterable_dynamic._is(iterable)) {
-        A.ArgumentError_checkNotNull(count, _s5_, type$.int);
-        A.RangeError_checkNotNegative(count, _s5_);
-        return new A.EfficientLengthSkipIterable(iterable, count, $E._eval$1("EfficientLengthSkipIterable<0>"));
+    getInterceptor$asx(receiver) {
+      if (typeof receiver == "string")
+        return J.JSString.prototype;
+      if (receiver == null)
+        return receiver;
+      if (Array.isArray(receiver))
+        return J.JSArray.prototype;
+      if (typeof receiver != "object") {
+        if (typeof receiver == "function")
+          return J.JavaScriptFunction.prototype;
+        if (typeof receiver == "symbol")
+          return J.JavaScriptSymbol.prototype;
+        if (typeof receiver == "bigint")
+          return J.JavaScriptBigInt.prototype;
+        return receiver;
       }
-      A.ArgumentError_checkNotNull(count, _s5_, type$.int);
-      A.RangeError_checkNotNegative(count, _s5_);
-      return new A.SkipIterable(iterable, count, $E._eval$1("SkipIterable<0>"));
+      if (receiver instanceof A.Object)
+        return receiver;
+      return J.getNativeInterceptor(receiver);
     },
-    IterableElementError_noElement() {
-      return new A.StateError("No element");
+    getInterceptor$ax(receiver) {
+      if (receiver == null)
+        return receiver;
+      if (Array.isArray(receiver))
+        return J.JSArray.prototype;
+      if (typeof receiver != "object") {
+        if (typeof receiver == "function")
+          return J.JavaScriptFunction.prototype;
+        if (typeof receiver == "symbol")
+          return J.JavaScriptSymbol.prototype;
+        if (typeof receiver == "bigint")
+          return J.JavaScriptBigInt.prototype;
+        return receiver;
+      }
+      if (receiver instanceof A.Object)
+        return receiver;
+      return J.getNativeInterceptor(receiver);
     },
-    IterableElementError_tooFew() {
-      return new A.StateError("Too few elements");
+    getInterceptor$n(receiver) {
+      if (typeof receiver == "number")
+        return J.JSNumber.prototype;
+      if (receiver == null)
+        return receiver;
+      if (!(receiver instanceof A.Object))
+        return J.UnknownJavaScriptObject.prototype;
+      return receiver;
     },
-    CastStream: function CastStream(t0, t1) {
-      this._source = t0;
-      this.$ti = t1;
+    getInterceptor$s(receiver) {
+      if (typeof receiver == "string")
+        return J.JSString.prototype;
+      if (receiver == null)
+        return receiver;
+      if (!(receiver instanceof A.Object))
+        return J.UnknownJavaScriptObject.prototype;
+      return receiver;
+    },
+    getInterceptor$x(receiver) {
+      if (receiver == null)
+        return receiver;
+      if (typeof receiver != "object") {
+        if (typeof receiver == "function")
+          return J.JavaScriptFunction.prototype;
+        if (typeof receiver == "symbol")
+          return J.JavaScriptSymbol.prototype;
+        if (typeof receiver == "bigint")
+          return J.JavaScriptBigInt.prototype;
+        return receiver;
+      }
+      if (receiver instanceof A.Object)
+        return receiver;
+      return J.getNativeInterceptor(receiver);
+    },
+    getInterceptor$z(receiver) {
+      if (receiver == null)
+        return receiver;
+      if (!(receiver instanceof A.Object))
+        return J.UnknownJavaScriptObject.prototype;
+      return receiver;
+    },
+    get$hashCode$(receiver) {
+      return J.getInterceptor$(receiver).get$hashCode(receiver);
+    },
+    get$isEmpty$asx(receiver) {
+      return J.getInterceptor$asx(receiver).get$isEmpty(receiver);
+    },
+    get$isNotEmpty$asx(receiver) {
+      return J.getInterceptor$asx(receiver).get$isNotEmpty(receiver);
+    },
+    get$iterator$ax(receiver) {
+      return J.getInterceptor$ax(receiver).get$iterator(receiver);
+    },
+    get$keys$x(receiver) {
+      return J.getInterceptor$x(receiver).get$keys(receiver);
+    },
+    get$length$asx(receiver) {
+      return J.getInterceptor$asx(receiver).get$length(receiver);
+    },
+    get$parent$z(receiver) {
+      return J.getInterceptor$z(receiver).get$parent(receiver);
+    },
+    get$runtimeType$(receiver) {
+      return J.getInterceptor$(receiver).get$runtimeType(receiver);
+    },
+    $eq$(receiver, a0) {
+      if (receiver == null)
+        return a0 == null;
+      if (typeof receiver != "object")
+        return a0 != null && receiver === a0;
+      return J.getInterceptor$(receiver).$eq(receiver, a0);
+    },
+    $index$asx(receiver, a0) {
+      if (typeof a0 === "number")
+        if (Array.isArray(receiver) || typeof receiver == "string" || A.isJsIndexable(receiver, receiver[init.dispatchPropertyName]))
+          if (a0 >>> 0 === a0 && a0 < receiver.length)
+            return receiver[a0];
+      return J.getInterceptor$asx(receiver).$index(receiver, a0);
+    },
+    $indexSet$ax(receiver, a0, a1) {
+      return J.getInterceptor$ax(receiver).$indexSet(receiver, a0, a1);
+    },
+    allMatches$1$s(receiver, a0) {
+      return J.getInterceptor$s(receiver).allMatches$1(receiver, a0);
+    },
+    allMatches$2$s(receiver, a0, a1) {
+      return J.getInterceptor$s(receiver).allMatches$2(receiver, a0, a1);
+    },
+    cancel$0$z(receiver) {
+      return J.getInterceptor$z(receiver).cancel$0(receiver);
+    },
+    cast$1$0$ax(receiver, $T1) {
+      return J.getInterceptor$ax(receiver).cast$1$0(receiver, $T1);
+    },
+    codeUnitAt$1$s(receiver, a0) {
+      return J.getInterceptor$s(receiver).codeUnitAt$1(receiver, a0);
+    },
+    contains$1$asx(receiver, a0) {
+      return J.getInterceptor$asx(receiver).contains$1(receiver, a0);
+    },
+    containsKey$1$x(receiver, a0) {
+      return J.getInterceptor$x(receiver).containsKey$1(receiver, a0);
+    },
+    elementAt$1$ax(receiver, a0) {
+      return J.getInterceptor$ax(receiver).elementAt$1(receiver, a0);
+    },
+    endsWith$1$s(receiver, a0) {
+      return J.getInterceptor$s(receiver).endsWith$1(receiver, a0);
+    },
+    forEach$1$x(receiver, a0) {
+      return J.getInterceptor$x(receiver).forEach$1(receiver, a0);
+    },
+    map$1$1$ax(receiver, a0, $T1) {
+      return J.getInterceptor$ax(receiver).map$1$1(receiver, a0, $T1);
+    },
+    matchAsPrefix$2$s(receiver, a0, a1) {
+      return J.getInterceptor$s(receiver).matchAsPrefix$2(receiver, a0, a1);
+    },
+    noSuchMethod$1$(receiver, a0) {
+      return J.getInterceptor$(receiver).noSuchMethod$1(receiver, a0);
+    },
+    skip$1$ax(receiver, a0) {
+      return J.getInterceptor$ax(receiver).skip$1(receiver, a0);
+    },
+    toInt$0$n(receiver) {
+      return J.getInterceptor$n(receiver).toInt$0(receiver);
+    },
+    toList$0$ax(receiver) {
+      return J.getInterceptor$ax(receiver).toList$0(receiver);
+    },
+    toString$0$(receiver) {
+      return J.getInterceptor$(receiver).toString$0(receiver);
+    },
+    Interceptor: function Interceptor() {
+    },
+    JSBool: function JSBool() {
+    },
+    JSNull: function JSNull() {
+    },
+    JavaScriptObject: function JavaScriptObject() {
+    },
+    LegacyJavaScriptObject: function LegacyJavaScriptObject() {
+    },
+    PlainJavaScriptObject: function PlainJavaScriptObject() {
+    },
+    UnknownJavaScriptObject: function UnknownJavaScriptObject() {
+    },
+    JavaScriptFunction: function JavaScriptFunction() {
+    },
+    JavaScriptBigInt: function JavaScriptBigInt() {
+    },
+    JavaScriptSymbol: function JavaScriptSymbol() {
+    },
+    JSArray: function JSArray(t0) {
+      this.$ti = t0;
+    },
+    JSUnmodifiableArray: function JSUnmodifiableArray(t0) {
+      this.$ti = t0;
+    },
+    ArrayIterator: function ArrayIterator(t0, t1, t2) {
+      var _ = this;
+      _._iterable = t0;
+      _.__interceptors$_length = t1;
+      _._index = 0;
+      _._current = null;
+      _.$ti = t2;
+    },
+    JSNumber: function JSNumber() {
+    },
+    JSInt: function JSInt() {
+    },
+    JSNumNotInt: function JSNumNotInt() {
+    },
+    JSString: function JSString() {
+    }
+  },
+  A = {JS_CONST: function JS_CONST() {
+    },
+    CastIterable_CastIterable(source, $S, $T) {
+      if ($S._eval$1("EfficientLengthIterable<0>")._is(source))
+        return new A._EfficientLengthCastIterable(source, $S._eval$1("@<0>")._bind$1($T)._eval$1("_EfficientLengthCastIterable<1,2>"));
+      return new A.CastIterable(source, $S._eval$1("@<0>")._bind$1($T)._eval$1("CastIterable<1,2>"));
+    },
+    hexDigitValue(char) {
+      var letter,
+        digit = char ^ 48;
+      if (digit <= 9)
+        return digit;
+      letter = char | 32;
+      if (97 <= letter && letter <= 102)
+        return letter - 87;
+      return -1;
+    },
+    SystemHash_combine(hash, value) {
+      hash = hash + value & 536870911;
+      hash = hash + ((hash & 524287) << 10) & 536870911;
+      return hash ^ hash >>> 6;
+    },
+    SystemHash_finish(hash) {
+      hash = hash + ((hash & 67108863) << 3) & 536870911;
+      hash ^= hash >>> 11;
+      return hash + ((hash & 16383) << 15) & 536870911;
+    },
+    checkNotNullable(value, $name, $T) {
+      return value;
+    },
+    isToStringVisiting(object) {
+      var t1, i;
+      for (t1 = $.toStringVisiting.length, i = 0; i < t1; ++i)
+        if (object === $.toStringVisiting[i])
+          return true;
+      return false;
+    },
+    SubListIterable$(_iterable, _start, _endOrLength, $E) {
+      A.RangeError_checkNotNegative(_start, "start");
+      if (_endOrLength != null) {
+        A.RangeError_checkNotNegative(_endOrLength, "end");
+        if (_start > _endOrLength)
+          A.throwExpression(A.RangeError$range(_start, 0, _endOrLength, "start", null));
+      }
+      return new A.SubListIterable(_iterable, _start, _endOrLength, $E._eval$1("SubListIterable<0>"));
+    },
+    MappedIterable_MappedIterable(iterable, $function, $S, $T) {
+      if (type$.EfficientLengthIterable_dynamic._is(iterable))
+        return new A.EfficientLengthMappedIterable(iterable, $function, $S._eval$1("@<0>")._bind$1($T)._eval$1("EfficientLengthMappedIterable<1,2>"));
+      return new A.MappedIterable(iterable, $function, $S._eval$1("@<0>")._bind$1($T)._eval$1("MappedIterable<1,2>"));
+    },
+    TakeIterable_TakeIterable(iterable, takeCount, $E) {
+      var _s9_ = "takeCount";
+      A.ArgumentError_checkNotNull(takeCount, _s9_, type$.int);
+      A.RangeError_checkNotNegative(takeCount, _s9_);
+      if (type$.EfficientLengthIterable_dynamic._is(iterable))
+        return new A.EfficientLengthTakeIterable(iterable, takeCount, $E._eval$1("EfficientLengthTakeIterable<0>"));
+      return new A.TakeIterable(iterable, takeCount, $E._eval$1("TakeIterable<0>"));
+    },
+    SkipIterable_SkipIterable(iterable, count, $E) {
+      var _s5_ = "count";
+      if (type$.EfficientLengthIterable_dynamic._is(iterable)) {
+        A.ArgumentError_checkNotNull(count, _s5_, type$.int);
+        A.RangeError_checkNotNegative(count, _s5_);
+        return new A.EfficientLengthSkipIterable(iterable, count, $E._eval$1("EfficientLengthSkipIterable<0>"));
+      }
+      A.ArgumentError_checkNotNull(count, _s5_, type$.int);
+      A.RangeError_checkNotNegative(count, _s5_);
+      return new A.SkipIterable(iterable, count, $E._eval$1("SkipIterable<0>"));
+    },
+    IterableElementError_noElement() {
+      return new A.StateError("No element");
+    },
+    IterableElementError_tooFew() {
+      return new A.StateError("Too few elements");
+    },
+    CastStream: function CastStream(t0, t1) {
+      this._source = t0;
+      this.$ti = t1;
     },
     CastStreamSubscription: function CastStreamSubscription(t0, t1, t2) {
       var _ = this;
@@ -1796,6 +2174,12 @@
       var future = rti._precomputed1;
       return future == null ? rti._precomputed1 = A._Universe__lookupInterfaceRti(universe, "Future", [rti._primary]) : future;
     },
+    Rti__getIsSubtypeCache(rti) {
+      var probe = rti._isSubtypeCache;
+      if (probe != null)
+        return probe;
+      return rti._isSubtypeCache = new Map();
+    },
     Rti__isUnionOfFunctionType(rti) {
       var kind = rti._kind;
       if (kind === 6 || kind === 7 || kind === 8)
@@ -2139,7 +2523,7 @@
       var testRti = this;
       if (object == null)
         return A._nullIs(testRti);
-      return A._isSubtype(init.typeUniverse, A.instanceOrFunctionType(object, testRti), null, testRti, null);
+      return A.isSubtype(init.typeUniverse, A.instanceOrFunctionType(object, testRti), testRti);
     },
     _generalNullableIsTestImplementation(object) {
       if (object == null)
@@ -2190,10 +2574,9 @@
       throw A.wrapException(A._TypeError$fromMessage(A._Error_compose(object, A._rtiToString(testRti, null))));
     },
     checkTypeBound(type, bound, variable, methodName) {
-      var _null = null;
-      if (A._isSubtype(init.typeUniverse, type, _null, bound, _null))
+      if (A.isSubtype(init.typeUniverse, type, bound))
         return type;
-      throw A.wrapException(A._TypeError$fromMessage("The type argument '" + A._rtiToString(type, _null) + "' is not a subtype of the type variable bound '" + A._rtiToString(bound, _null) + "' of type variable '" + variable + "' in '" + methodName + "'."));
+      throw A.wrapException(A._TypeError$fromMessage("The type argument '" + A._rtiToString(type, null) + "' is not a subtype of the type variable bound '" + A._rtiToString(bound, null) + "' of type variable '" + variable + "' in '" + methodName + "'."));
     },
     _Error_compose(object, checkedTypeDescription) {
       return A.Error_safeToString(object) + ": type '" + A._rtiToString(A._structuralTypeOf(object), null) + "' is not a subtype of type '" + checkedTypeDescription + "'";
@@ -3104,6 +3487,16 @@
         return typeArguments[index - 1];
       throw A.wrapException(A.AssertionError$("Bad index " + index + " for " + environment.toString$0(0)));
     },
+    isSubtype(universe, s, t) {
+      var result,
+        sCache = A.Rti__getIsSubtypeCache(s),
+        probe = sCache.get(t);
+      if (probe != null)
+        return probe;
+      result = A._isSubtype(universe, s, null, t, null);
+      sCache.set(t, result);
+      return result;
+    },
     _isSubtype(universe, s, sEnv, t, tEnv) {
       var t1, sKind, leftTypeVariable, tKind, t2, sBounds, tBounds, sLength, i, sBound, tBound;
       if (s === t)
@@ -3382,7 +3775,7 @@
       var _ = this;
       _._as = t0;
       _._is = t1;
-      _._cachedRuntimeType = _._specializedTestResource = _._precomputed1 = null;
+      _._cachedRuntimeType = _._specializedTestResource = _._unsoundIsSubtypeCache = _._isSubtypeCache = _._precomputed1 = null;
       _._kind = 0;
       _._canonicalRecipe = _._bindCache = _._evalCache = _._rest = _._primary = null;
     },
@@ -6087,7 +6480,7 @@
         }
     },
     _createTables() {
-      var _i, t1, t2, t3, t4, t5,
+      var _i, t1, t2, t3, b,
         _s77_ = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-._~!$&'()*+,;=",
         _s1_ = ".", _s1_0 = ":", _s1_1 = "/", _s1_2 = "\\", _s1_3 = "?", _s1_4 = "#", _s2_ = "/\\",
         tables = A._setArrayType(new Array(22), type$.JSArray_Uint8List);
@@ -6096,139 +6489,138 @@
       t1 = new A._createTables_build(tables);
       t2 = new A._createTables_setChars();
       t3 = new A._createTables_setRange();
-      t4 = type$.Uint8List;
-      t5 = t4._as(t1.call$2(0, 225));
-      t2.call$3(t5, _s77_, 1);
-      t2.call$3(t5, _s1_, 14);
-      t2.call$3(t5, _s1_0, 34);
-      t2.call$3(t5, _s1_1, 3);
-      t2.call$3(t5, _s1_2, 227);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(14, 225));
-      t2.call$3(t5, _s77_, 1);
-      t2.call$3(t5, _s1_, 15);
-      t2.call$3(t5, _s1_0, 34);
-      t2.call$3(t5, _s2_, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(15, 225));
-      t2.call$3(t5, _s77_, 1);
-      t2.call$3(t5, "%", 225);
-      t2.call$3(t5, _s1_0, 34);
-      t2.call$3(t5, _s1_1, 9);
-      t2.call$3(t5, _s1_2, 233);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(1, 225));
-      t2.call$3(t5, _s77_, 1);
-      t2.call$3(t5, _s1_0, 34);
-      t2.call$3(t5, _s1_1, 10);
-      t2.call$3(t5, _s1_2, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(2, 235));
-      t2.call$3(t5, _s77_, 139);
-      t2.call$3(t5, _s1_1, 131);
-      t2.call$3(t5, _s1_2, 131);
-      t2.call$3(t5, _s1_, 146);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(3, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_1, 68);
-      t2.call$3(t5, _s1_2, 68);
-      t2.call$3(t5, _s1_, 18);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(4, 229));
-      t2.call$3(t5, _s77_, 5);
-      t3.call$3(t5, "AZ", 229);
-      t2.call$3(t5, _s1_0, 102);
-      t2.call$3(t5, "@", 68);
-      t2.call$3(t5, "[", 232);
-      t2.call$3(t5, _s1_1, 138);
-      t2.call$3(t5, _s1_2, 138);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(5, 229));
-      t2.call$3(t5, _s77_, 5);
-      t3.call$3(t5, "AZ", 229);
-      t2.call$3(t5, _s1_0, 102);
-      t2.call$3(t5, "@", 68);
-      t2.call$3(t5, _s1_1, 138);
-      t2.call$3(t5, _s1_2, 138);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(6, 231));
-      t3.call$3(t5, "19", 7);
-      t2.call$3(t5, "@", 68);
-      t2.call$3(t5, _s1_1, 138);
-      t2.call$3(t5, _s1_2, 138);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(7, 231));
-      t3.call$3(t5, "09", 7);
-      t2.call$3(t5, "@", 68);
-      t2.call$3(t5, _s1_1, 138);
-      t2.call$3(t5, _s1_2, 138);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t2.call$3(t4._as(t1.call$2(8, 8)), "]", 5);
-      t5 = t4._as(t1.call$2(9, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_, 16);
-      t2.call$3(t5, _s2_, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(16, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_, 17);
-      t2.call$3(t5, _s2_, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(17, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_1, 9);
-      t2.call$3(t5, _s1_2, 233);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(10, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_, 18);
-      t2.call$3(t5, _s1_1, 10);
-      t2.call$3(t5, _s1_2, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(18, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_, 19);
-      t2.call$3(t5, _s2_, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(19, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s2_, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(11, 235));
-      t2.call$3(t5, _s77_, 11);
-      t2.call$3(t5, _s1_1, 10);
-      t2.call$3(t5, _s1_2, 234);
-      t2.call$3(t5, _s1_3, 172);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(12, 236));
-      t2.call$3(t5, _s77_, 12);
-      t2.call$3(t5, _s1_3, 12);
-      t2.call$3(t5, _s1_4, 205);
-      t5 = t4._as(t1.call$2(13, 237));
-      t2.call$3(t5, _s77_, 13);
-      t2.call$3(t5, _s1_3, 13);
-      t3.call$3(t4._as(t1.call$2(20, 245)), "az", 21);
-      t1 = t4._as(t1.call$2(21, 245));
-      t3.call$3(t1, "az", 21);
-      t3.call$3(t1, "09", 21);
-      t2.call$3(t1, "+-.", 21);
+      b = t1.call$2(0, 225);
+      t2.call$3(b, _s77_, 1);
+      t2.call$3(b, _s1_, 14);
+      t2.call$3(b, _s1_0, 34);
+      t2.call$3(b, _s1_1, 3);
+      t2.call$3(b, _s1_2, 227);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(14, 225);
+      t2.call$3(b, _s77_, 1);
+      t2.call$3(b, _s1_, 15);
+      t2.call$3(b, _s1_0, 34);
+      t2.call$3(b, _s2_, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(15, 225);
+      t2.call$3(b, _s77_, 1);
+      t2.call$3(b, "%", 225);
+      t2.call$3(b, _s1_0, 34);
+      t2.call$3(b, _s1_1, 9);
+      t2.call$3(b, _s1_2, 233);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(1, 225);
+      t2.call$3(b, _s77_, 1);
+      t2.call$3(b, _s1_0, 34);
+      t2.call$3(b, _s1_1, 10);
+      t2.call$3(b, _s1_2, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(2, 235);
+      t2.call$3(b, _s77_, 139);
+      t2.call$3(b, _s1_1, 131);
+      t2.call$3(b, _s1_2, 131);
+      t2.call$3(b, _s1_, 146);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(3, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_1, 68);
+      t2.call$3(b, _s1_2, 68);
+      t2.call$3(b, _s1_, 18);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(4, 229);
+      t2.call$3(b, _s77_, 5);
+      t3.call$3(b, "AZ", 229);
+      t2.call$3(b, _s1_0, 102);
+      t2.call$3(b, "@", 68);
+      t2.call$3(b, "[", 232);
+      t2.call$3(b, _s1_1, 138);
+      t2.call$3(b, _s1_2, 138);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(5, 229);
+      t2.call$3(b, _s77_, 5);
+      t3.call$3(b, "AZ", 229);
+      t2.call$3(b, _s1_0, 102);
+      t2.call$3(b, "@", 68);
+      t2.call$3(b, _s1_1, 138);
+      t2.call$3(b, _s1_2, 138);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(6, 231);
+      t3.call$3(b, "19", 7);
+      t2.call$3(b, "@", 68);
+      t2.call$3(b, _s1_1, 138);
+      t2.call$3(b, _s1_2, 138);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(7, 231);
+      t3.call$3(b, "09", 7);
+      t2.call$3(b, "@", 68);
+      t2.call$3(b, _s1_1, 138);
+      t2.call$3(b, _s1_2, 138);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      t2.call$3(t1.call$2(8, 8), "]", 5);
+      b = t1.call$2(9, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_, 16);
+      t2.call$3(b, _s2_, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(16, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_, 17);
+      t2.call$3(b, _s2_, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(17, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_1, 9);
+      t2.call$3(b, _s1_2, 233);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(10, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_, 18);
+      t2.call$3(b, _s1_1, 10);
+      t2.call$3(b, _s1_2, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(18, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_, 19);
+      t2.call$3(b, _s2_, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(19, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s2_, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(11, 235);
+      t2.call$3(b, _s77_, 11);
+      t2.call$3(b, _s1_1, 10);
+      t2.call$3(b, _s1_2, 234);
+      t2.call$3(b, _s1_3, 172);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(12, 236);
+      t2.call$3(b, _s77_, 12);
+      t2.call$3(b, _s1_3, 12);
+      t2.call$3(b, _s1_4, 205);
+      b = t1.call$2(13, 237);
+      t2.call$3(b, _s77_, 13);
+      t2.call$3(b, _s1_3, 13);
+      t3.call$3(t1.call$2(20, 245), "az", 21);
+      b = t1.call$2(21, 245);
+      t3.call$3(b, "az", 21);
+      t3.call$3(b, "09", 21);
+      t2.call$3(b, "+-.", 21);
       return tables;
     },
     _scan(uri, start, end, state, indices) {
@@ -7170,749 +7562,371 @@
     Trace_toString_closure0: function Trace_toString_closure0() {
     },
     Trace_toString_closure: function Trace_toString_closure(t0) {
-      this.longest = t0;
-    },
-    UnparsedFrame: function UnparsedFrame(t0, t1) {
-      this.uri = t0;
-      this.member = t1;
-    },
-    GuaranteeChannel$(innerStream, innerSink, allowSinkErrors, $T) {
-      var t2, t1 = {};
-      t1.innerStream = innerStream;
-      t2 = new A.GuaranteeChannel($T._eval$1("GuaranteeChannel<0>"));
-      t2.GuaranteeChannel$3$allowSinkErrors(innerSink, true, t1, $T);
-      return t2;
-    },
-    GuaranteeChannel: function GuaranteeChannel(t0) {
-      var _ = this;
-      _.__GuaranteeChannel__streamController_F = _.__GuaranteeChannel__sink_F = $;
-      _._subscription = null;
-      _._disconnected = false;
-      _.$ti = t0;
-    },
-    GuaranteeChannel_closure: function GuaranteeChannel_closure(t0, t1, t2) {
-      this._box_0 = t0;
-      this.$this = t1;
-      this.T = t2;
-    },
-    GuaranteeChannel__closure: function GuaranteeChannel__closure(t0) {
-      this.$this = t0;
-    },
-    _GuaranteeSink: function _GuaranteeSink(t0, t1, t2, t3, t4) {
-      var _ = this;
-      _._inner = t0;
-      _._channel = t1;
-      _._doneCompleter = t2;
-      _._closed = _._disconnected = false;
-      _._addStreamCompleter = _._addStreamSubscription = null;
-      _._allowErrors = t3;
-      _.$ti = t4;
-    },
-    _GuaranteeSink_addStream_closure: function _GuaranteeSink_addStream_closure(t0) {
-      this.$this = t0;
-    },
-    _MultiChannel$(inner, $T) {
-      var t1 = type$.int;
-      t1 = new A._MultiChannel(inner, A.StreamChannelController$(true, $T), A.LinkedHashMap_LinkedHashMap$_empty(t1, $T._eval$1("StreamChannelController<0>")), A.LinkedHashSet_LinkedHashSet$_empty(t1), A.LinkedHashSet_LinkedHashSet$_empty(t1), $T._eval$1("_MultiChannel<0>"));
-      t1._MultiChannel$1(inner, $T);
-      return t1;
-    },
-    _MultiChannel: function _MultiChannel(t0, t1, t2, t3, t4, t5) {
-      var _ = this;
-      _._multi_channel$_inner = t0;
-      _._innerStreamSubscription = null;
-      _._mainController = t1;
-      _._controllers = t2;
-      _._pendingIds = t3;
-      _._closedIds = t4;
-      _._nextId = 1;
-      _.$ti = t5;
-    },
-    _MultiChannel_closure: function _MultiChannel_closure(t0, t1) {
-      this.$this = t0;
-      this.T = t1;
-    },
-    _MultiChannel_closure0: function _MultiChannel_closure0(t0) {
-      this.$this = t0;
-    },
-    _MultiChannel_closure1: function _MultiChannel_closure1(t0, t1) {
-      this.$this = t0;
-      this.T = t1;
-    },
-    _MultiChannel__closure: function _MultiChannel__closure(t0, t1, t2) {
-      this.$this = t0;
-      this.id = t1;
-      this.T = t2;
-    },
-    _MultiChannel_virtualChannel_closure: function _MultiChannel_virtualChannel_closure(t0, t1) {
-      this._box_0 = t0;
-      this.$this = t1;
-    },
-    _MultiChannel_virtualChannel_closure0: function _MultiChannel_virtualChannel_closure0(t0, t1) {
-      this._box_0 = t0;
-      this.$this = t1;
-    },
-    VirtualChannel: function VirtualChannel(t0, t1, t2, t3) {
-      var _ = this;
-      _._parent = t0;
-      _.stream = t1;
-      _.sink = t2;
-      _.$ti = t3;
-    },
-    StreamChannelController$(sync, $T) {
-      var _null = null,
-        t1 = new A.StreamChannelController($T._eval$1("StreamChannelController<0>")),
-        localToForeignController = A.StreamController_StreamController(_null, _null, true, $T),
-        foreignToLocalController = A.StreamController_StreamController(_null, _null, true, $T),
-        t2 = A._instanceType(foreignToLocalController),
-        t3 = A._instanceType(localToForeignController),
-        t4 = $T._eval$1("StreamChannel<0>");
-      t1.set$__StreamChannelController__local_F(t4._as(A.GuaranteeChannel$(new A._ControllerStream(foreignToLocalController, t2._eval$1("_ControllerStream<1>")), new A._StreamSinkWrapper(localToForeignController, t3._eval$1("_StreamSinkWrapper<1>")), true, $T)));
-      t2 = t4._as(A.GuaranteeChannel$(new A._ControllerStream(localToForeignController, t3._eval$1("_ControllerStream<1>")), new A._StreamSinkWrapper(foreignToLocalController, t2._eval$1("_StreamSinkWrapper<1>")), true, $T));
-      t1.__StreamChannelController__foreign_F !== $ && A.throwLateFieldAI("_foreign");
-      t1.set$__StreamChannelController__foreign_F(t2);
-      return t1;
-    },
-    StreamChannelController: function StreamChannelController(t0) {
-      this.__StreamChannelController__foreign_F = this.__StreamChannelController__local_F = $;
-      this.$ti = t0;
-    },
-    StreamChannelMixin: function StreamChannelMixin() {
-    },
-    EventTargetExtension_addEventListener(_this, type, listener) {
-      var t1 = A._setArrayType([type, listener], type$.JSArray_Object);
-      A.callMethod(_this, "addEventListener", t1, type$.dynamic);
-    },
-    EventTargetExtension_removeEventListener(_this, type, listener) {
-      var t1 = A._setArrayType([type, listener], type$.JSArray_Object);
-      A.callMethod(_this, "removeEventListener", t1, type$.dynamic);
-    },
-    MessagePortExtension_get_postMessage(_this) {
-      return new A.MessagePortExtension_get_postMessage_closure(_this);
-    },
-    _callConstructor(constructorName, args) {
-      var $constructor = self.window[constructorName];
-      if ($constructor == null)
-        return null;
-      return A.callConstructor($constructor, args, type$.nullable_Object);
-    },
-    Subscription$(target, type, listener) {
-      A.EventTargetExtension_addEventListener(target, type, listener);
-      return new A.Subscription(type, target, listener);
-    },
-    MessagePortExtension_get_postMessage_closure: function MessagePortExtension_get_postMessage_closure(t0) {
-      this._this = t0;
-    },
-    Subscription: function Subscription(t0, t1, t2) {
-      this.type = t0;
-      this.target = t1;
-      this.listener = t2;
-    },
-    main() {
-      var t1 = type$.JavaScriptObject;
-      t1._as(self.window.console).log("Dart test runner browser host running");
-      if (J.$eq$($.$get$_currentUrl().get$queryParameters().$index(0, "debug"), "true"))
-        t1._as(type$.nullable_JavaScriptObject._as(self.document.body).classList).add("debug");
-      A.runZonedGuarded(new A.main_closure(), new A.main_closure0(), type$.Null);
-    },
-    _connectToServer() {
-      var t2, controller, t3,
-        t1 = $.$get$_currentUrl().get$queryParameters().$index(0, "managerUrl");
-      t1.toString;
-      t1 = A._callConstructor("WebSocket", A._setArrayType([t1], type$.JSArray_Object));
-      t1.toString;
-      type$.JavaScriptObject._as(t1);
-      t2 = type$.dynamic;
-      controller = A.StreamChannelController$(true, t2);
-      A.EventTargetExtension_addEventListener(t1, "message", A.allowInterop(new A._connectToServer_closure(controller), type$.void_Function_JavaScriptObject));
-      t3 = controller.__StreamChannelController__local_F;
-      t3 === $ && A.throwLateFieldNI("_local");
-      t3 = t3.__GuaranteeChannel__streamController_F;
-      t3 === $ && A.throwLateFieldNI("_streamController");
-      new A._ControllerStream(t3, A._instanceType(t3)._eval$1("_ControllerStream<1>")).listen$1(new A._connectToServer_closure0(t1));
-      t1 = controller.__StreamChannelController__foreign_F;
-      t1 === $ && A.throwLateFieldNI("_foreign");
-      return A._MultiChannel$(t1, t2);
-    },
-    _connectToIframe(url, id) {
-      var t2, t3, t4, iframe, controller, windowSubscription,
-        suiteUrl = A.Uri_parse(url).removeFragment$0(),
-        t1 = type$.JavaScriptObject;
-      t1._as(self.window.console).log("Starting suite " + suiteUrl.toString$0(0));
-      t2 = self.document;
-      t3 = A._setArrayType(["iframe"], type$.JSArray_Object);
-      t4 = type$.dynamic;
-      iframe = t1._as(A.callMethod(t2, "createElement", t3, t4));
-      $._iframes.$indexSet(0, id, iframe);
-      controller = A.StreamChannelController$(true, t4);
-      windowSubscription = A._Cell$named("windowSubscription");
-      windowSubscription._value = A.Subscription$(self.window, "message", A.allowInterop(new A._connectToIframe_closure(iframe, windowSubscription, suiteUrl, id, controller), type$.void_Function_JavaScriptObject));
-      iframe.src = url;
-      t1._as(type$.nullable_JavaScriptObject._as(self.document.body).appendChild(iframe));
-      t1 = controller.__StreamChannelController__foreign_F;
-      t1 === $ && A.throwLateFieldNI("_foreign");
-      return t1;
-    },
-    main_closure: function main_closure() {
-    },
-    main__closure: function main__closure(t0) {
-      this.serverChannel = t0;
-    },
-    main___closure: function main___closure(t0) {
-      this._0_0 = t0;
-    },
-    main___closure0: function main___closure0(t0) {
-      this._0_0 = t0;
-    },
-    main___closure1: function main___closure1(t0) {
-      this._0_0 = t0;
-    },
-    main___closure2: function main___closure2(t0) {
-      this._0_0 = t0;
-    },
-    main___closure3: function main___closure3(t0) {
-      this._0_0 = t0;
-    },
-    main___closure4: function main___closure4(t0) {
-      this._0_0 = t0;
-    },
-    main__closure0: function main__closure0(t0) {
-      this.serverChannel = t0;
-    },
-    main__closure1: function main__closure1(t0) {
-      this.serverChannel = t0;
-    },
-    main__closure2: function main__closure2(t0) {
-      this.serverChannel = t0;
-    },
-    main__closure3: function main__closure3(t0) {
-      this.serverChannel = t0;
-    },
-    main_closure0: function main_closure0() {
-    },
-    _connectToServer_closure: function _connectToServer_closure(t0) {
-      this.controller = t0;
-    },
-    _connectToServer_closure0: function _connectToServer_closure0(t0) {
-      this.webSocket = t0;
-    },
-    _connectToIframe_closure: function _connectToIframe_closure(t0, t1, t2, t3, t4) {
-      var _ = this;
-      _.iframe = t0;
-      _.windowSubscription = t1;
-      _.suiteUrl = t2;
-      _.id = t3;
-      _.controller = t4;
-    },
-    _connectToIframe__closure1: function _connectToIframe__closure1(t0) {
-      this.controller = t0;
-    },
-    _connectToIframe__closure: function _connectToIframe__closure(t0) {
-      this._0_0 = t0;
-    },
-    _connectToIframe__closure0: function _connectToIframe__closure0(t0) {
-      this._0_0 = t0;
-    },
-    max(a, b, $T) {
-      A.checkTypeBound($T, type$.num, "T", "max");
-      return Math.max($T._as(a), $T._as(b));
-    },
-    printString(string) {
-      if (typeof dartPrint == "function") {
-        dartPrint(string);
-        return;
-      }
-      if (typeof console == "object" && typeof console.log != "undefined") {
-        console.log(string);
-        return;
-      }
-      if (typeof print == "function") {
-        print(string);
-        return;
-      }
-      throw "Unable to print message: " + String(string);
-    },
-    _convertNativeToDart_Value(value) {
-      var proto, t1, values, i;
-      if (value == null)
-        return value;
-      if (typeof value == "string" || typeof value == "number" || A._isBool(value))
-        return value;
-      proto = Object.getPrototypeOf(value);
-      t1 = proto === Object.prototype;
-      t1.toString;
-      if (!t1) {
-        t1 = proto === null;
-        t1.toString;
-      } else
-        t1 = true;
-      if (t1)
-        return A.convertNativeToDart_Dictionary(value);
-      t1 = Array.isArray(value);
-      t1.toString;
-      if (t1) {
-        values = [];
-        i = 0;
-        while (true) {
-          t1 = value.length;
-          t1.toString;
-          if (!(i < t1))
-            break;
-          values.push(A._convertNativeToDart_Value(value[i]));
-          ++i;
-        }
-        return values;
-      }
-      return value;
-    },
-    convertNativeToDart_Dictionary(object) {
-      var dict, keys, t1, _i, key, t2;
-      if (object == null)
-        return null;
-      dict = A.LinkedHashMap_LinkedHashMap$_empty(type$.String, type$.dynamic);
-      keys = Object.getOwnPropertyNames(object);
-      for (t1 = keys.length, _i = 0; _i < keys.length; keys.length === t1 || (0, A.throwConcurrentModificationError)(keys), ++_i) {
-        key = keys[_i];
-        t2 = key;
-        t2.toString;
-        dict.$indexSet(0, t2, A._convertNativeToDart_Value(object[key]));
-      }
-      return dict;
-    },
-    current() {
-      var exception, t1, path, lastIndex, uri = null;
-      try {
-        uri = A.Uri_base();
-      } catch (exception) {
-        if (type$.Exception._is(A.unwrapException(exception))) {
-          t1 = $._current;
-          if (t1 != null)
-            return t1;
-          throw exception;
-        } else
-          throw exception;
-      }
-      if (J.$eq$(uri, $._currentUriBase)) {
-        t1 = $._current;
-        t1.toString;
-        return t1;
-      }
-      $._currentUriBase = uri;
-      if ($.$get$Style_platform() === $.$get$Style_url())
-        t1 = $._current = uri.resolve$1(".").toString$0(0);
-      else {
-        path = uri.toFilePath$0();
-        lastIndex = path.length - 1;
-        t1 = $._current = lastIndex === 0 ? path : B.JSString_methods.substring$2(path, 0, lastIndex);
-      }
-      return t1;
-    },
-    isAlphabetic(char) {
-      var t1;
-      if (!(char >= 65 && char <= 90))
-        t1 = char >= 97 && char <= 122;
-      else
-        t1 = true;
-      return t1;
-    },
-    isDriveLetter(path, index) {
-      var t3,
-        t1 = path.length,
-        t2 = index + 2;
-      if (t1 < t2)
-        return false;
-      if (!(index >= 0 && index < t1))
-        return A.ioore(path, index);
-      if (!A.isAlphabetic(path.charCodeAt(index)))
-        return false;
-      t3 = index + 1;
-      if (!(t3 < t1))
-        return A.ioore(path, t3);
-      if (path.charCodeAt(t3) !== 58)
-        return false;
-      if (t1 === t2)
-        return true;
-      if (!(t2 >= 0 && t2 < t1))
-        return A.ioore(path, t2);
-      return path.charCodeAt(t2) === 47;
-    }
-  },
-  J = {
-    makeDispatchRecord(interceptor, proto, extension, indexability) {
-      return {i: interceptor, p: proto, e: extension, x: indexability};
-    },
-    getNativeInterceptor(object) {
-      var proto, objectProto, $constructor, interceptor, t1,
-        record = object[init.dispatchPropertyName];
-      if (record == null)
-        if ($.initNativeDispatchFlag == null) {
-          A.initNativeDispatch();
-          record = object[init.dispatchPropertyName];
-        }
-      if (record != null) {
-        proto = record.p;
-        if (false === proto)
-          return record.i;
-        if (true === proto)
-          return object;
-        objectProto = Object.getPrototypeOf(object);
-        if (proto === objectProto)
-          return record.i;
-        if (record.e === objectProto)
-          throw A.wrapException(A.UnimplementedError$("Return interceptor for " + A.S(proto(object, record))));
-      }
-      $constructor = object.constructor;
-      if ($constructor == null)
-        interceptor = null;
-      else {
-        t1 = $._JS_INTEROP_INTERCEPTOR_TAG;
-        if (t1 == null)
-          t1 = $._JS_INTEROP_INTERCEPTOR_TAG = init.getIsolateTag("_$dart_js");
-        interceptor = $constructor[t1];
-      }
-      if (interceptor != null)
-        return interceptor;
-      interceptor = A.lookupAndCacheInterceptor(object);
-      if (interceptor != null)
-        return interceptor;
-      if (typeof object == "function")
-        return B.JavaScriptFunction_methods;
-      proto = Object.getPrototypeOf(object);
-      if (proto == null)
-        return B.PlainJavaScriptObject_methods;
-      if (proto === Object.prototype)
-        return B.PlainJavaScriptObject_methods;
-      if (typeof $constructor == "function") {
-        t1 = $._JS_INTEROP_INTERCEPTOR_TAG;
-        if (t1 == null)
-          t1 = $._JS_INTEROP_INTERCEPTOR_TAG = init.getIsolateTag("_$dart_js");
-        Object.defineProperty($constructor, t1, {value: B.UnknownJavaScriptObject_methods, enumerable: false, writable: true, configurable: true});
-        return B.UnknownJavaScriptObject_methods;
-      }
-      return B.UnknownJavaScriptObject_methods;
-    },
-    JSArray_JSArray$fixed($length, $E) {
-      if ($length < 0 || $length > 4294967295)
-        throw A.wrapException(A.RangeError$range($length, 0, 4294967295, "length", null));
-      return J.JSArray_JSArray$markFixed(new Array($length), $E);
-    },
-    JSArray_JSArray$growable($length, $E) {
-      if ($length < 0)
-        throw A.wrapException(A.ArgumentError$("Length must be a non-negative integer: " + $length, null));
-      return A._setArrayType(new Array($length), $E._eval$1("JSArray<0>"));
-    },
-    JSArray_JSArray$markFixed(allocation, $E) {
-      return J.JSArray_markFixedList(A._setArrayType(allocation, $E._eval$1("JSArray<0>")), $E);
-    },
-    JSArray_markFixedList(list, $T) {
-      list.fixed$length = Array;
-      return list;
-    },
-    JSArray_markUnmodifiableList(list) {
-      list.fixed$length = Array;
-      list.immutable$list = Array;
-      return list;
-    },
-    JSString__isWhitespace(codeUnit) {
-      if (codeUnit < 256)
-        switch (codeUnit) {
-          case 9:
-          case 10:
-          case 11:
-          case 12:
-          case 13:
-          case 32:
-          case 133:
-          case 160:
-            return true;
-          default:
-            return false;
-        }
-      switch (codeUnit) {
-        case 5760:
-        case 8192:
-        case 8193:
-        case 8194:
-        case 8195:
-        case 8196:
-        case 8197:
-        case 8198:
-        case 8199:
-        case 8200:
-        case 8201:
-        case 8202:
-        case 8232:
-        case 8233:
-        case 8239:
-        case 8287:
-        case 12288:
-        case 65279:
-          return true;
-        default:
-          return false;
-      }
-    },
-    JSString__skipLeadingWhitespace(string, index) {
-      var t1, codeUnit;
-      for (t1 = string.length; index < t1;) {
-        codeUnit = string.charCodeAt(index);
-        if (codeUnit !== 32 && codeUnit !== 13 && !J.JSString__isWhitespace(codeUnit))
-          break;
-        ++index;
-      }
-      return index;
+      this.longest = t0;
     },
-    JSString__skipTrailingWhitespace(string, index) {
-      var t1, index0, codeUnit;
-      for (t1 = string.length; index > 0; index = index0) {
-        index0 = index - 1;
-        if (!(index0 < t1))
-          return A.ioore(string, index0);
-        codeUnit = string.charCodeAt(index0);
-        if (codeUnit !== 32 && codeUnit !== 13 && !J.JSString__isWhitespace(codeUnit))
-          break;
-      }
-      return index;
+    UnparsedFrame: function UnparsedFrame(t0, t1) {
+      this.uri = t0;
+      this.member = t1;
     },
-    getInterceptor$(receiver) {
-      if (typeof receiver == "number") {
-        if (Math.floor(receiver) == receiver)
-          return J.JSInt.prototype;
-        return J.JSNumNotInt.prototype;
-      }
-      if (typeof receiver == "string")
-        return J.JSString.prototype;
-      if (receiver == null)
-        return J.JSNull.prototype;
-      if (typeof receiver == "boolean")
-        return J.JSBool.prototype;
-      if (Array.isArray(receiver))
-        return J.JSArray.prototype;
-      if (typeof receiver != "object") {
-        if (typeof receiver == "function")
-          return J.JavaScriptFunction.prototype;
-        if (typeof receiver == "symbol")
-          return J.JavaScriptSymbol.prototype;
-        if (typeof receiver == "bigint")
-          return J.JavaScriptBigInt.prototype;
-        return receiver;
-      }
-      if (receiver instanceof A.Object)
-        return receiver;
-      return J.getNativeInterceptor(receiver);
+    GuaranteeChannel$(innerStream, innerSink, allowSinkErrors, $T) {
+      var t2, t1 = {};
+      t1.innerStream = innerStream;
+      t2 = new A.GuaranteeChannel($T._eval$1("GuaranteeChannel<0>"));
+      t2.GuaranteeChannel$3$allowSinkErrors(innerSink, true, t1, $T);
+      return t2;
     },
-    getInterceptor$asx(receiver) {
-      if (typeof receiver == "string")
-        return J.JSString.prototype;
-      if (receiver == null)
-        return receiver;
-      if (Array.isArray(receiver))
-        return J.JSArray.prototype;
-      if (typeof receiver != "object") {
-        if (typeof receiver == "function")
-          return J.JavaScriptFunction.prototype;
-        if (typeof receiver == "symbol")
-          return J.JavaScriptSymbol.prototype;
-        if (typeof receiver == "bigint")
-          return J.JavaScriptBigInt.prototype;
-        return receiver;
-      }
-      if (receiver instanceof A.Object)
-        return receiver;
-      return J.getNativeInterceptor(receiver);
+    GuaranteeChannel: function GuaranteeChannel(t0) {
+      var _ = this;
+      _.__GuaranteeChannel__streamController_F = _.__GuaranteeChannel__sink_F = $;
+      _._subscription = null;
+      _._disconnected = false;
+      _.$ti = t0;
     },
-    getInterceptor$ax(receiver) {
-      if (receiver == null)
-        return receiver;
-      if (Array.isArray(receiver))
-        return J.JSArray.prototype;
-      if (typeof receiver != "object") {
-        if (typeof receiver == "function")
-          return J.JavaScriptFunction.prototype;
-        if (typeof receiver == "symbol")
-          return J.JavaScriptSymbol.prototype;
-        if (typeof receiver == "bigint")
-          return J.JavaScriptBigInt.prototype;
-        return receiver;
-      }
-      if (receiver instanceof A.Object)
-        return receiver;
-      return J.getNativeInterceptor(receiver);
+    GuaranteeChannel_closure: function GuaranteeChannel_closure(t0, t1, t2) {
+      this._box_0 = t0;
+      this.$this = t1;
+      this.T = t2;
     },
-    getInterceptor$n(receiver) {
-      if (typeof receiver == "number")
-        return J.JSNumber.prototype;
-      if (receiver == null)
-        return receiver;
-      if (!(receiver instanceof A.Object))
-        return J.UnknownJavaScriptObject.prototype;
-      return receiver;
+    GuaranteeChannel__closure: function GuaranteeChannel__closure(t0) {
+      this.$this = t0;
     },
-    getInterceptor$s(receiver) {
-      if (typeof receiver == "string")
-        return J.JSString.prototype;
-      if (receiver == null)
-        return receiver;
-      if (!(receiver instanceof A.Object))
-        return J.UnknownJavaScriptObject.prototype;
-      return receiver;
+    _GuaranteeSink: function _GuaranteeSink(t0, t1, t2, t3, t4) {
+      var _ = this;
+      _._inner = t0;
+      _._channel = t1;
+      _._doneCompleter = t2;
+      _._closed = _._disconnected = false;
+      _._addStreamCompleter = _._addStreamSubscription = null;
+      _._allowErrors = t3;
+      _.$ti = t4;
     },
-    getInterceptor$x(receiver) {
-      if (receiver == null)
-        return receiver;
-      if (typeof receiver != "object") {
-        if (typeof receiver == "function")
-          return J.JavaScriptFunction.prototype;
-        if (typeof receiver == "symbol")
-          return J.JavaScriptSymbol.prototype;
-        if (typeof receiver == "bigint")
-          return J.JavaScriptBigInt.prototype;
-        return receiver;
-      }
-      if (receiver instanceof A.Object)
-        return receiver;
-      return J.getNativeInterceptor(receiver);
+    _GuaranteeSink_addStream_closure: function _GuaranteeSink_addStream_closure(t0) {
+      this.$this = t0;
     },
-    getInterceptor$z(receiver) {
-      if (receiver == null)
-        return receiver;
-      if (!(receiver instanceof A.Object))
-        return J.UnknownJavaScriptObject.prototype;
-      return receiver;
+    _MultiChannel$(inner, $T) {
+      var t1 = type$.int;
+      t1 = new A._MultiChannel(inner, A.StreamChannelController$(true, $T), A.LinkedHashMap_LinkedHashMap$_empty(t1, $T._eval$1("StreamChannelController<0>")), A.LinkedHashSet_LinkedHashSet$_empty(t1), A.LinkedHashSet_LinkedHashSet$_empty(t1), $T._eval$1("_MultiChannel<0>"));
+      t1._MultiChannel$1(inner, $T);
+      return t1;
     },
-    get$hashCode$(receiver) {
-      return J.getInterceptor$(receiver).get$hashCode(receiver);
+    _MultiChannel: function _MultiChannel(t0, t1, t2, t3, t4, t5) {
+      var _ = this;
+      _._multi_channel$_inner = t0;
+      _._innerStreamSubscription = null;
+      _._mainController = t1;
+      _._controllers = t2;
+      _._pendingIds = t3;
+      _._closedIds = t4;
+      _._nextId = 1;
+      _.$ti = t5;
     },
-    get$isEmpty$asx(receiver) {
-      return J.getInterceptor$asx(receiver).get$isEmpty(receiver);
+    _MultiChannel_closure: function _MultiChannel_closure(t0, t1) {
+      this.$this = t0;
+      this.T = t1;
     },
-    get$isNotEmpty$asx(receiver) {
-      return J.getInterceptor$asx(receiver).get$isNotEmpty(receiver);
+    _MultiChannel_closure0: function _MultiChannel_closure0(t0) {
+      this.$this = t0;
     },
-    get$iterator$ax(receiver) {
-      return J.getInterceptor$ax(receiver).get$iterator(receiver);
+    _MultiChannel_closure1: function _MultiChannel_closure1(t0, t1) {
+      this.$this = t0;
+      this.T = t1;
     },
-    get$keys$x(receiver) {
-      return J.getInterceptor$x(receiver).get$keys(receiver);
+    _MultiChannel__closure: function _MultiChannel__closure(t0, t1, t2) {
+      this.$this = t0;
+      this.id = t1;
+      this.T = t2;
     },
-    get$length$asx(receiver) {
-      return J.getInterceptor$asx(receiver).get$length(receiver);
+    _MultiChannel_virtualChannel_closure: function _MultiChannel_virtualChannel_closure(t0, t1) {
+      this._box_0 = t0;
+      this.$this = t1;
     },
-    get$parent$z(receiver) {
-      return J.getInterceptor$z(receiver).get$parent(receiver);
+    _MultiChannel_virtualChannel_closure0: function _MultiChannel_virtualChannel_closure0(t0, t1) {
+      this._box_0 = t0;
+      this.$this = t1;
     },
-    get$runtimeType$(receiver) {
-      return J.getInterceptor$(receiver).get$runtimeType(receiver);
+    VirtualChannel: function VirtualChannel(t0, t1, t2, t3) {
+      var _ = this;
+      _._parent = t0;
+      _.stream = t1;
+      _.sink = t2;
+      _.$ti = t3;
     },
-    $eq$(receiver, a0) {
-      if (receiver == null)
-        return a0 == null;
-      if (typeof receiver != "object")
-        return a0 != null && receiver === a0;
-      return J.getInterceptor$(receiver).$eq(receiver, a0);
+    StreamChannelController$(sync, $T) {
+      var _null = null,
+        t1 = new A.StreamChannelController($T._eval$1("StreamChannelController<0>")),
+        localToForeignController = A.StreamController_StreamController(_null, _null, true, $T),
+        foreignToLocalController = A.StreamController_StreamController(_null, _null, true, $T),
+        t2 = A._instanceType(foreignToLocalController),
+        t3 = A._instanceType(localToForeignController),
+        t4 = $T._eval$1("StreamChannel<0>");
+      t1.set$__StreamChannelController__local_F(t4._as(A.GuaranteeChannel$(new A._ControllerStream(foreignToLocalController, t2._eval$1("_ControllerStream<1>")), new A._StreamSinkWrapper(localToForeignController, t3._eval$1("_StreamSinkWrapper<1>")), true, $T)));
+      t2 = t4._as(A.GuaranteeChannel$(new A._ControllerStream(localToForeignController, t3._eval$1("_ControllerStream<1>")), new A._StreamSinkWrapper(foreignToLocalController, t2._eval$1("_StreamSinkWrapper<1>")), true, $T));
+      t1.__StreamChannelController__foreign_F !== $ && A.throwLateFieldAI("_foreign");
+      t1.set$__StreamChannelController__foreign_F(t2);
+      return t1;
     },
-    $index$asx(receiver, a0) {
-      if (typeof a0 === "number")
-        if (Array.isArray(receiver) || typeof receiver == "string" || A.isJsIndexable(receiver, receiver[init.dispatchPropertyName]))
-          if (a0 >>> 0 === a0 && a0 < receiver.length)
-            return receiver[a0];
-      return J.getInterceptor$asx(receiver).$index(receiver, a0);
+    StreamChannelController: function StreamChannelController(t0) {
+      this.__StreamChannelController__foreign_F = this.__StreamChannelController__local_F = $;
+      this.$ti = t0;
     },
-    $indexSet$ax(receiver, a0, a1) {
-      return J.getInterceptor$ax(receiver).$indexSet(receiver, a0, a1);
+    StreamChannelMixin: function StreamChannelMixin() {
     },
-    allMatches$1$s(receiver, a0) {
-      return J.getInterceptor$s(receiver).allMatches$1(receiver, a0);
+    EventTargetExtension_addEventListener(_this, type, listener) {
+      var t1 = A._setArrayType([type, listener], type$.JSArray_Object);
+      A.callMethod(_this, "addEventListener", t1, type$.dynamic);
     },
-    allMatches$2$s(receiver, a0, a1) {
-      return J.getInterceptor$s(receiver).allMatches$2(receiver, a0, a1);
+    EventTargetExtension_removeEventListener(_this, type, listener) {
+      var t1 = A._setArrayType([type, listener], type$.JSArray_Object);
+      A.callMethod(_this, "removeEventListener", t1, type$.dynamic);
     },
-    cancel$0$z(receiver) {
-      return J.getInterceptor$z(receiver).cancel$0(receiver);
+    MessagePortExtension_get_postMessage(_this) {
+      return new A.MessagePortExtension_get_postMessage_closure(_this);
     },
-    cast$1$0$ax(receiver, $T1) {
-      return J.getInterceptor$ax(receiver).cast$1$0(receiver, $T1);
+    _callConstructor(constructorName, args) {
+      var $constructor = self.window[constructorName];
+      if ($constructor == null)
+        return null;
+      return A.callConstructor($constructor, args, type$.nullable_Object);
+    },
+    Subscription$(target, type, listener) {
+      A.EventTargetExtension_addEventListener(target, type, listener);
+      return new A.Subscription(type, target, listener);
+    },
+    MessagePortExtension_get_postMessage_closure: function MessagePortExtension_get_postMessage_closure(t0) {
+      this._this = t0;
     },
-    codeUnitAt$1$s(receiver, a0) {
-      return J.getInterceptor$s(receiver).codeUnitAt$1(receiver, a0);
+    Subscription: function Subscription(t0, t1, t2) {
+      this.type = t0;
+      this.target = t1;
+      this.listener = t2;
     },
-    contains$1$asx(receiver, a0) {
-      return J.getInterceptor$asx(receiver).contains$1(receiver, a0);
+    main() {
+      var t1 = type$.JavaScriptObject;
+      t1._as(self.window.console).log("Dart test runner browser host running");
+      if (J.$eq$($.$get$_currentUrl().get$queryParameters().$index(0, "debug"), "true"))
+        t1._as(type$.nullable_JavaScriptObject._as(self.document.body).classList).add("debug");
+      A.runZonedGuarded(new A.main_closure(), new A.main_closure0(), type$.Null);
     },
-    containsKey$1$x(receiver, a0) {
-      return J.getInterceptor$x(receiver).containsKey$1(receiver, a0);
+    _connectToServer() {
+      var t2, controller, t3,
+        t1 = $.$get$_currentUrl().get$queryParameters().$index(0, "managerUrl");
+      t1.toString;
+      t1 = A._callConstructor("WebSocket", A._setArrayType([t1], type$.JSArray_Object));
+      t1.toString;
+      type$.JavaScriptObject._as(t1);
+      t2 = type$.dynamic;
+      controller = A.StreamChannelController$(true, t2);
+      A.EventTargetExtension_addEventListener(t1, "message", A.allowInterop(new A._connectToServer_closure(controller), type$.void_Function_JavaScriptObject));
+      t3 = controller.__StreamChannelController__local_F;
+      t3 === $ && A.throwLateFieldNI("_local");
+      t3 = t3.__GuaranteeChannel__streamController_F;
+      t3 === $ && A.throwLateFieldNI("_streamController");
+      new A._ControllerStream(t3, A._instanceType(t3)._eval$1("_ControllerStream<1>")).listen$1(new A._connectToServer_closure0(t1));
+      t1 = controller.__StreamChannelController__foreign_F;
+      t1 === $ && A.throwLateFieldNI("_foreign");
+      return A._MultiChannel$(t1, t2);
     },
-    elementAt$1$ax(receiver, a0) {
-      return J.getInterceptor$ax(receiver).elementAt$1(receiver, a0);
+    _connectToIframe(url, id) {
+      var t2, t3, t4, iframe, controller, windowSubscription,
+        suiteUrl = A.Uri_parse(url).removeFragment$0(),
+        t1 = type$.JavaScriptObject;
+      t1._as(self.window.console).log("Starting suite " + suiteUrl.toString$0(0));
+      t2 = self.document;
+      t3 = A._setArrayType(["iframe"], type$.JSArray_Object);
+      t4 = type$.dynamic;
+      iframe = t1._as(A.callMethod(t2, "createElement", t3, t4));
+      $._iframes.$indexSet(0, id, iframe);
+      controller = A.StreamChannelController$(true, t4);
+      windowSubscription = A._Cell$named("windowSubscription");
+      windowSubscription._value = A.Subscription$(self.window, "message", A.allowInterop(new A._connectToIframe_closure(iframe, windowSubscription, suiteUrl, id, controller), type$.void_Function_JavaScriptObject));
+      iframe.src = url;
+      t1._as(type$.nullable_JavaScriptObject._as(self.document.body).appendChild(iframe));
+      t1 = controller.__StreamChannelController__foreign_F;
+      t1 === $ && A.throwLateFieldNI("_foreign");
+      return t1;
     },
-    endsWith$1$s(receiver, a0) {
-      return J.getInterceptor$s(receiver).endsWith$1(receiver, a0);
+    main_closure: function main_closure() {
     },
-    forEach$1$x(receiver, a0) {
-      return J.getInterceptor$x(receiver).forEach$1(receiver, a0);
+    main__closure: function main__closure(t0) {
+      this.serverChannel = t0;
     },
-    map$1$1$ax(receiver, a0, $T1) {
-      return J.getInterceptor$ax(receiver).map$1$1(receiver, a0, $T1);
+    main___closure: function main___closure(t0) {
+      this._0_0 = t0;
     },
-    matchAsPrefix$2$s(receiver, a0, a1) {
-      return J.getInterceptor$s(receiver).matchAsPrefix$2(receiver, a0, a1);
+    main___closure0: function main___closure0(t0) {
+      this._0_0 = t0;
     },
-    noSuchMethod$1$(receiver, a0) {
-      return J.getInterceptor$(receiver).noSuchMethod$1(receiver, a0);
+    main___closure1: function main___closure1(t0) {
+      this._0_0 = t0;
     },
-    skip$1$ax(receiver, a0) {
-      return J.getInterceptor$ax(receiver).skip$1(receiver, a0);
+    main___closure2: function main___closure2(t0) {
+      this._0_0 = t0;
     },
-    toInt$0$n(receiver) {
-      return J.getInterceptor$n(receiver).toInt$0(receiver);
+    main___closure3: function main___closure3(t0) {
+      this._0_0 = t0;
     },
-    toList$0$ax(receiver) {
-      return J.getInterceptor$ax(receiver).toList$0(receiver);
+    main___closure4: function main___closure4(t0) {
+      this._0_0 = t0;
     },
-    toString$0$(receiver) {
-      return J.getInterceptor$(receiver).toString$0(receiver);
+    main__closure0: function main__closure0(t0) {
+      this.serverChannel = t0;
     },
-    Interceptor: function Interceptor() {
+    main__closure1: function main__closure1(t0) {
+      this.serverChannel = t0;
     },
-    JSBool: function JSBool() {
+    main__closure2: function main__closure2(t0) {
+      this.serverChannel = t0;
     },
-    JSNull: function JSNull() {
+    main__closure3: function main__closure3(t0) {
+      this.serverChannel = t0;
     },
-    JavaScriptObject: function JavaScriptObject() {
+    main_closure0: function main_closure0() {
     },
-    LegacyJavaScriptObject: function LegacyJavaScriptObject() {
+    _connectToServer_closure: function _connectToServer_closure(t0) {
+      this.controller = t0;
     },
-    PlainJavaScriptObject: function PlainJavaScriptObject() {
+    _connectToServer_closure0: function _connectToServer_closure0(t0) {
+      this.webSocket = t0;
     },
-    UnknownJavaScriptObject: function UnknownJavaScriptObject() {
+    _connectToIframe_closure: function _connectToIframe_closure(t0, t1, t2, t3, t4) {
+      var _ = this;
+      _.iframe = t0;
+      _.windowSubscription = t1;
+      _.suiteUrl = t2;
+      _.id = t3;
+      _.controller = t4;
     },
-    JavaScriptFunction: function JavaScriptFunction() {
+    _connectToIframe__closure1: function _connectToIframe__closure1(t0) {
+      this.controller = t0;
     },
-    JavaScriptBigInt: function JavaScriptBigInt() {
+    _connectToIframe__closure: function _connectToIframe__closure(t0) {
+      this._0_0 = t0;
     },
-    JavaScriptSymbol: function JavaScriptSymbol() {
+    _connectToIframe__closure0: function _connectToIframe__closure0(t0) {
+      this._0_0 = t0;
     },
-    JSArray: function JSArray(t0) {
-      this.$ti = t0;
+    max(a, b, $T) {
+      A.checkTypeBound($T, type$.num, "T", "max");
+      return Math.max($T._as(a), $T._as(b));
     },
-    JSUnmodifiableArray: function JSUnmodifiableArray(t0) {
-      this.$ti = t0;
+    printString(string) {
+      if (typeof dartPrint == "function") {
+        dartPrint(string);
+        return;
+      }
+      if (typeof console == "object" && typeof console.log != "undefined") {
+        console.log(string);
+        return;
+      }
+      if (typeof print == "function") {
+        print(string);
+        return;
+      }
+      throw "Unable to print message: " + String(string);
     },
-    ArrayIterator: function ArrayIterator(t0, t1, t2) {
-      var _ = this;
-      _._iterable = t0;
-      _.__interceptors$_length = t1;
-      _._index = 0;
-      _._current = null;
-      _.$ti = t2;
+    _convertNativeToDart_Value(value) {
+      var proto, t1, values, i;
+      if (value == null)
+        return value;
+      if (typeof value == "string" || typeof value == "number" || A._isBool(value))
+        return value;
+      proto = Object.getPrototypeOf(value);
+      t1 = proto === Object.prototype;
+      t1.toString;
+      if (!t1) {
+        t1 = proto === null;
+        t1.toString;
+      } else
+        t1 = true;
+      if (t1)
+        return A.convertNativeToDart_Dictionary(value);
+      t1 = Array.isArray(value);
+      t1.toString;
+      if (t1) {
+        values = [];
+        i = 0;
+        while (true) {
+          t1 = value.length;
+          t1.toString;
+          if (!(i < t1))
+            break;
+          values.push(A._convertNativeToDart_Value(value[i]));
+          ++i;
+        }
+        return values;
+      }
+      return value;
     },
-    JSNumber: function JSNumber() {
+    convertNativeToDart_Dictionary(object) {
+      var dict, keys, t1, _i, key, t2;
+      if (object == null)
+        return null;
+      dict = A.LinkedHashMap_LinkedHashMap$_empty(type$.String, type$.dynamic);
+      keys = Object.getOwnPropertyNames(object);
+      for (t1 = keys.length, _i = 0; _i < keys.length; keys.length === t1 || (0, A.throwConcurrentModificationError)(keys), ++_i) {
+        key = keys[_i];
+        t2 = key;
+        t2.toString;
+        dict.$indexSet(0, t2, A._convertNativeToDart_Value(object[key]));
+      }
+      return dict;
     },
-    JSInt: function JSInt() {
+    current() {
+      var exception, t1, path, lastIndex, uri = null;
+      try {
+        uri = A.Uri_base();
+      } catch (exception) {
+        if (type$.Exception._is(A.unwrapException(exception))) {
+          t1 = $._current;
+          if (t1 != null)
+            return t1;
+          throw exception;
+        } else
+          throw exception;
+      }
+      if (J.$eq$(uri, $._currentUriBase)) {
+        t1 = $._current;
+        t1.toString;
+        return t1;
+      }
+      $._currentUriBase = uri;
+      if ($.$get$Style_platform() === $.$get$Style_url())
+        t1 = $._current = uri.resolve$1(".").toString$0(0);
+      else {
+        path = uri.toFilePath$0();
+        lastIndex = path.length - 1;
+        t1 = $._current = lastIndex === 0 ? path : B.JSString_methods.substring$2(path, 0, lastIndex);
+      }
+      return t1;
     },
-    JSNumNotInt: function JSNumNotInt() {
+    isAlphabetic(char) {
+      var t1;
+      if (!(char >= 65 && char <= 90))
+        t1 = char >= 97 && char <= 122;
+      else
+        t1 = true;
+      return t1;
     },
-    JSString: function JSString() {
+    isDriveLetter(path, index) {
+      var t3,
+        t1 = path.length,
+        t2 = index + 2;
+      if (t1 < t2)
+        return false;
+      if (!(index >= 0 && index < t1))
+        return A.ioore(path, index);
+      if (!A.isAlphabetic(path.charCodeAt(index)))
+        return false;
+      t3 = index + 1;
+      if (!(t3 < t1))
+        return A.ioore(path, t3);
+      if (path.charCodeAt(t3) !== 58)
+        return false;
+      if (t1 === t2)
+        return true;
+      if (!(t2 >= 0 && t2 < t1))
+        return A.ioore(path, t2);
+      return path.charCodeAt(t2) === 47;
     }
   },
   B = {};
@@ -17377,15 +17391,14 @@
   };
   A._connectToIframe_closure.prototype = {
     call$1($event) {
-      var $location, t2, _0_0, _0_6, _0_11, port, data, _this = this, _null = null,
+      var t2, _0_0, _0_6, _0_11, port, data, _this = this, _null = null,
         t1 = type$.JavaScriptObject;
       t1._as($event);
       if (A._asString($event.origin) !== A._asString(t1._as(self.window.location).origin))
         return;
-      $location = $event.source.location;
-      if ($location == null)
-        return;
-      if (!J.$eq$($location.href, A._asStringQ(_this.iframe.src)))
+      t2 = $event.source.location;
+      t2 = t2 == null ? _null : A._asStringQ(t2.href);
+      if (t2 != A._asStringQ(_this.iframe.src))
         return;
       $event.stopPropagation();
       t2 = _this.windowSubscription._readLocal$0();
@@ -17744,7 +17757,7 @@
     leafTags: null,
     arrayRti: Symbol("$ti")
   };
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diff --git a/pkgs/test/pubspec.yaml b/pkgs/test/pubspec.yaml
index 7fd0525f2..3f89e739d 100644
--- a/pkgs/test/pubspec.yaml
+++ b/pkgs/test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 1.24.8
+version: 1.24.9-wip
 description: >-
   A full featured library for writing and running Dart tests across platforms.
 repository: https://github.com/dart-lang/test/tree/master/pkgs/test
diff --git a/pkgs/test/tool/host.dart b/pkgs/test/tool/host.dart
index 6b347f47f..b9b803bcb 100644
--- a/pkgs/test/tool/host.dart
+++ b/pkgs/test/tool/host.dart
@@ -9,7 +9,6 @@ import 'dart:async';
 import 'dart:convert';
 
 import 'package:js/js.dart';
-import 'package:js/js_util.dart' as js_util;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:stream_channel/stream_channel.dart';
 import 'package:test/src/runner/browser/dom.dart' as dom;
@@ -219,9 +218,7 @@ StreamChannel<dynamic> _connectToIframe(String url, int id) {
     if (message.origin != dom.window.location.origin) return;
     // Disambiguate between frames for different test suites.
     // Depending on the source type, the `location.href` may be missing.
-    var location = js_util.getProperty(message.source, 'location') as Object?;
-    if (location == null) return;
-    if (js_util.getProperty(location, 'href') != iframe.src) return;
+    if (message.source.location?.href != iframe.src) return;
 
     message.stopPropagation();
     windowSubscription.cancel();