assert: fix deepEqual regression

Change of Object.keys in ES6 breaks assert.deepEqual about primitive
values.

V8: https://code.google.com/p/v8/issues/detail?id=3443

Previously deepEqual depends on Object.key that throws an error for
a primitive value, but now Object.key does not throw.

PR-URL: #193
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

lib/assert.js

@@ -201,8 +201,9 @@ function objEquiv(a, b) {
     return false;
   // an identical 'prototype' property.
   if (a.prototype !== b.prototype) return false;
-  //~~~I've managed to break Object.keys through screwy arguments passing.
-  //   Converting to array solves the problem.
+  // if one is a primitive, the other must be same
+  if (util.isPrimitive(a) || util.isPrimitive(b))
+    return a === b;
   var aIsArgs = isArguments(a),
       bIsArgs = isArguments(b);
   if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
@@ -212,13 +213,9 @@ function objEquiv(a, b) {
     b = pSlice.call(b);
     return _deepEqual(a, b);
   }
-  try {
-    var ka = Object.keys(a),
-        kb = Object.keys(b),
-        key, i;
-  } catch (e) {//happens when one is a string literal and the other isn't
-    return false;
-  }
+  var ka = Object.keys(a),
+      kb = Object.keys(b),
+      key, i;
   // having the same number of owned properties (keys incorporates
   // hasOwnProperty)
   if (ka.length != kb.length)

test/parallel/test-assert.js

@@ -153,8 +153,22 @@ nameBuilder2.prototype = Object;
 nb2 = new nameBuilder2('Ryan', 'Dahl');
 assert.throws(makeBlock(a.deepEqual, nb1, nb2), a.AssertionError);
 
-// String literal + object blew up my implementation...
-assert.throws(makeBlock(a.deepEqual, 'a', {}), a.AssertionError);
+// primitives and object
+assert.throws(makeBlock(a.deepEqual, null, {}), a.AssertionError);
+assert.throws(makeBlock(a.deepEqual, undefined, {}), a.AssertionError);
+assert.throws(makeBlock(a.deepEqual, 'a', ['a']), a.AssertionError);
+assert.throws(makeBlock(a.deepEqual, 'a', {0: 'a'}), a.AssertionError);
+assert.throws(makeBlock(a.deepEqual, 1, {}), a.AssertionError);
+assert.throws(makeBlock(a.deepEqual, true, {}), a.AssertionError);
+if (typeof Symbol === 'symbol') {
+  assert.throws(makeBlock(assert.deepEqual, Symbol(), {}), a.AssertionError);
+}
+
+// primitive wrappers and object
+assert.doesNotThrow(makeBlock(a.deepEqual, new String('a'), ['a']), a.AssertionError);
+assert.doesNotThrow(makeBlock(a.deepEqual, new String('a'), {0: 'a'}), a.AssertionError);
+assert.doesNotThrow(makeBlock(a.deepEqual, new Number(1), {}), a.AssertionError);
+assert.doesNotThrow(makeBlock(a.deepEqual, new Boolean(true), {}), a.AssertionError);
 
 // Testing the throwing
 function thrower(errorConstructor) {