Reapply "Avoid "=== true" inside code by calling a function that does this for us."

tests/language/src/Operator5Test.dart

Index: tests/language/src/Operator5Test.dart
diff --git a/tests/language/src/Operator5Test.dart b/tests/language/src/Operator5Test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..87c86fbb8c04163e1256ed1fc1fa47e8f467950c
--- /dev/null
+++ b/tests/language/src/Operator5Test.dart
@@ -0,0 +1,61 @@
+// 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.
+
+class A {
+  operator ==(other) => 1;
+  operator <(other) => null;
+  operator <=(other) => 499;
+  operator >(other) => "foo";
+  operator >=(other) => 42;
+}
+
+// This triggered a bug in Dart2Js: equality operator was always boolified.
+equals(a) {
+  try {
+    Expect.equals(1, a == a);
+  } catch(TypeError e) {
+    // In checked mode the test doesn't do anything.
+  }
+}
+
+equalsNull(a) {
+  try {
+    Expect.equals(1, a == null);
+  } catch(TypeError e) {
+    // In checked mode the test doesn't do anything.
+  }
+}
+
+less(a) {
+  try {
+    Expect.equals(null, a < a);
+  } catch(TypeError e) {}
+}
+
+lessEqual(a) {
+  try {
+    Expect.equals(499, a <= a);
+  } catch(TypeError e) {}
+}
+
+greater(a) {
+  try {
+    Expect.equals("foo", a > a);
+  } catch(TypeError e) {}
+}
+
+greaterEqual(a) {
+  try {
+    Expect.equals(42, a >= a);
+  } catch(TypeError e) {}
+}
+
+main() {
+  var a = new A();
+  equals(a);
+  less(a);
+  lessEqual(a);
+  greater(a);
+  greaterEqual(a);
+}