[VarDumper] Add named arguments coverage of VarDumper's function

Tests/Dumper/functions/dd_with_named_args.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Test dd() with named args show label
+--FILE--
+<?php
+putenv('NO_COLOR=1');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+dd(label2: "dd() with label");
+
+--EXPECT--
+label2 "dd() with label"

Tests/Dumper/functions/dump_with_named_args.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Test dd() with named args show label
+--FILE--
+<?php
+putenv('NO_COLOR=1');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+dump("first dump", label1: "dump() with label");
+
+--EXPECT--
+1 "first dump"
+label1 "dump() with label"

Tests/Dumper/functions/dump_without_args.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Test dd() without args displays debug hint
+--FILE--
+<?php
+putenv('NO_COLOR=1');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+dump();
+
+--EXPECT--
+🐛