a === b -> identical(a, b)

tests/compiler/dart2js/type_equals_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/util/util.dart";
 import "compiler_helper.dart";
 import "parser_helper.dart";
 import "dart:uri";
 
 bool test(compiler, String name1, String name2, {bool expect}) {
   Expect.isTrue(?expect, 'required parameter "expect" not given');
   var clazz = findElement(compiler, "Class");
   clazz.ensureResolved(compiler);
   var element1 = clazz.buildScope().lookup(buildSourceString(name1));
   var element2 = clazz.buildScope().lookup(buildSourceString(name2));
   Expect.isNotNull(element1);
   Expect.isNotNull(element2);
-  Expect.isTrue(element1.kind === ElementKind.FUNCTION);
-  Expect.isTrue(element2.kind === ElementKind.FUNCTION);
+  Expect.equals(element1.kind, ElementKind.FUNCTION);
+  Expect.equals(element2.kind, ElementKind.FUNCTION);
   FunctionSignature signature1 = element1.computeSignature(compiler);
   FunctionSignature signature2 = element2.computeSignature(compiler);
 
   // Function signatures are used to be to provide void types (only occuring as
   // as return types) and (inlined) function types (only occuring as method
   // parameter types).
   //
   // Only a single type is used from each signature. That is, it is not the
   // intention to check the whole signatures against eachother.
   DartType type1;
@@ skipping 76 matching lines @@
   test(compiler, "String1", "ListInt1", expect: false);
   test(compiler, "ListInt1", "ListString1", expect: false);
   test(compiler, "ListString1", "MapIntString1", expect: false);
   test(compiler, "MapIntString1", "TypeVar1", expect: false);
   test(compiler, "TypeVar1", "Function1a", expect: false);
   test(compiler, "Function1a", "Function1b", expect: false);
   test(compiler, "Function1b", "Typedef1a", expect: false);
   test(compiler, "Typedef1a", "Typedef1b", expect: false);
   test(compiler, "Typedef1b", "Typedef1c", expect: false);
 }