Add optional message to assert in Dart2js - continued

tests/compiler/dart2js_extra/assert_with_message_test.dart

+// Copyright (c) 2015, 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 "package:expect/expect.dart";
+
+@AssumeDynamic() @NoInline()
+confuse(x) => x;
+
+
+testFalse(name, fault) {
+  try {
+    fault();
+  } catch (e) {
+    Expect.isTrue(e is AssertionError, '$name: is AssertionError');
+    Expect.isTrue('$e'.contains('Mumble'), '$name: <<$e>> contains "Mumble"');
+    return;
+  }
+  Expect.fail('Expected assert to throw');
+}
+
+test1() {
+  testFalse('constant false', () { assert(false, 'Mumble'); });
+}
+
+test2() {
+  testFalse('constant function', () { assert(() => false, 'Mumble'); });
+}
+
+test3() {
+  testFalse('variable false', () { assert(confuse(false), 'Mumble'); });
+}
+
+test4() {
+  testFalse('variable function',
+      () { assert(confuse(() => false), 'Mumble'); });
+}
+
+testTypeErrors() {
+  check(name, fault) {
+    try {
+      fault();
+    } catch (e) {
+      Expect.isTrue(e is TypeError,
+          'name: <<$e>> (${e.runtimeType}) is TypeError');
+      return;
+    }
+    Expect.fail('Expected assert to throw');
+  }
+
+  check('constant type error', () { assert(null, 'Mumble'); });
+  check('variable type error', () { assert(confuse(null), 'Mumble'); });
+  check('function type error', () { assert(confuse(() => null), 'Mumble'); });
+}
+
+testMessageEffect1() {
+  var v = 1;
+  // Message is not evaluated on succeeding assert.
+  assert(confuse(true), '${v = 123}');
+  Expect.equals(1, v);
+}
+
+testMessageEffect2() {
+  var v = 1;
+  try {
+    // Message is evaluated to produce AssertionError argument on failing
+    // assert.
+    assert(confuse(false), '${v = 123}');
+  } catch (e) {
+    Expect.equals(123, v);
+    Expect.isTrue('$e'.contains('123'), '<<$e>> contains "123"');
+    return;
+  }
+  Expect.fail('Expected assert to throw');
+}
+
+testMessageEffect3() {
+  var v = 1;
+  try {
+    // Message is evaluated to produce AssertionError argument on failing
+    // assert.
+    assert(confuse(() => ++v > 100), '${++v}');
+  } catch (e) {
+    Expect.equals(3, v);
+    Expect.isTrue('$e'.contains('3'), '<<$e>> contains "3"');
+    return;
+  }
+  Expect.fail('Expected assert to throw');
+}
+
+bool get checkedMode {
+  bool b = false;
+  assert((b = true));
+  return b;
+}
+
+main() {
+  if (!checkedMode) return;
+
+  test1();
+  test2();
+  test3();
+  test4();
+  testTypeErrors();
+  testMessageEffect1();
+  testMessageEffect2();
+  testMessageEffect3();
+}