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

tests/language/bool_test.dart

 // Copyright (c) 2011, 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.
 
 // Dart test program for testing basic boolean properties.
 // @static-clean
 
 class BoolTest {
   static void testEquality() {
     Expect.equals(true, true);
     Expect.equals(false, false);
-    Expect.equals(true, true === true);
-    Expect.equals(false, true === false);
-    Expect.equals(true, false === false);
-    Expect.equals(false, false === true);
-    Expect.equals(false, true !== true);
-    Expect.equals(true, true !== false);
-    Expect.equals(false, false !== false);
-    Expect.equals(true, false !== true);
+    Expect.equals(true, identical(true, true));

[Lasse Reichstein Nielsen, 2012/11/12 13:10:41]

 Expect.identical(true, true) 
and
 Expect.isFalse(identical(true, false))
Consider adding Expect.notIdentical

[floitsch, 2012/11/12 22:18:43]

Changed to .isTrue / .isFalse.
Kept the identicals. We don't want to go through the Expect to do the identical
check. (This is one of the most basic tests).

+    Expect.equals(false, identical(true, false));
+    Expect.equals(true, identical(false, false));
+    Expect.equals(false, identical(false, true));
+    Expect.equals(false, !identical(true, true));
+    Expect.equals(true, !identical(true, false));
+    Expect.equals(false, !identical(false, false));
+    Expect.equals(true, !identical(false, true));
     Expect.equals(true, true == true);
     Expect.equals(false, true == false);
     Expect.equals(true, false == false);
     Expect.equals(false, false == true);
     Expect.equals(false, true != true);
     Expect.equals(true, true != false);
     Expect.equals(false, false != false);
     Expect.equals(true, false != true);
-    Expect.equals(true, true === (true == true));
-    Expect.equals(true, false === (true == false));
-    Expect.equals(true, true === (false == false));
-    Expect.equals(true, false === (false == true));
-    Expect.equals(false, true !== (true == true));
-    Expect.equals(false, false !== (true == false));
-    Expect.equals(false, true !== (false == false));
-    Expect.equals(false, false !== (false == true));
-    Expect.equals(false, false === (true == true));
-    Expect.equals(false, true === (true == false));
-    Expect.equals(false, false === (false == false));
-    Expect.equals(false, true === (false == true));
-    Expect.equals(true, false !== (true == true));
-    Expect.equals(true, true !== (true == false));
-    Expect.equals(true, false !== (false == false));
-    Expect.equals(true, true !== (false == true));
+    Expect.equals(true, identical(true, (true == true)));
+    Expect.equals(true, identical(false, (true == false)));
+    Expect.equals(true, identical(true, (false == false)));
+    Expect.equals(true, identical(false, (false == true)));
+    Expect.equals(false, !identical(true, (true == true)));
+    Expect.equals(false, !identical(false, (true == false)));
+    Expect.equals(false, !identical(true, (false == false)));
+    Expect.equals(false, !identical(false, (false == true)));
+    Expect.equals(false, identical(false, (true == true)));
+    Expect.equals(false, identical(true, (true == false)));
+    Expect.equals(false, identical(false, (false == false)));
+    Expect.equals(false, identical(true, (false == true)));
+    Expect.equals(true, !identical(false, (true == true)));
+    Expect.equals(true, !identical(true, (true == false)));
+    Expect.equals(true, !identical(false, (false == false)));
+    Expect.equals(true, !identical(true, (false == true)));
     // Expect.equals could rely on a broken boolean equality.
     if (true == false) {
       throw "Expect.equals broken";
     }
     if (false == true) {
       throw "Expect.equals broken";
     }
-    if (true === false) {
+    if (identical(true, false)) {
       throw "Expect.equals broken";
     }
-    if (false === true) {
+    if (identical(false, true)) {
       throw "Expect.equals broken";
     }
     if (true == true) {
     } else {
       throw "Expect.equals broken";
     }
     if (false == false) {
     } else {
       throw "Expect.equals broken";
     }
-    if (true === true) {
+    if (identical(true, true)) {
     } else {
       throw "Expect.equals broken";
     }
-    if (false === false) {
+    if (identical(false, false)) {
     } else {
       throw "Expect.equals broken";
     }
     if (true != false) {
     } else {
       throw "Expect.equals broken";
     }
     if (false != true) {
     } else {
       throw "Expect.equals broken";
     }
-    if (true !== false) {
+    if (!identical(true, false)) {
     } else {
       throw "Expect.equals broken";
     }
-    if (false !== true) {
+    if (!identical(false, true)) {
     } else {
       throw "Expect.equals broken";
     }
     if (true != true) {
       throw "Expect.equals broken";
     }
     if (false != false) {
       throw "Expect.equals broken";
     }
-    if (true !== true) {
+    if (!identical(true, true)) {
       throw "Expect.equals broken";
     }
-    if (false !== false) {
+    if (!identical(false, false)) {
       throw "Expect.equals broken";
     }
   }
 
   static void testToString() {
     Expect.equals("true", true.toString());
     Expect.equals("false", false.toString());
   }
 
   static void testNegate(isTrue, isFalse) {
@@ skipping 101 matching lines @@
     testEquality();
     testNegate(true, false);
     testToString();
     testLogicalOp();
   }
 }
 
 main() {
   BoolTest.testMain();
 }