Reapply "Port regexp tests from V8 to Dart."

tests/corelib/regexp/v8_regexp_utils.dart

+// Copyright (c) 2014, 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.
+
+// Utility functions to easy porting of V8 tests.

[Lasse Reichstein Nielsen, 2014/10/29 11:25:31]

to->for
(or, avoiding passive tense, "to easily port v8 tests.").

[zerny-google, 2014/10/30 11:31:28]

Done.

+
+import "package:expect/expect.dart";
+
+void assertEquals(actual, expected, [String message = null]) {
+  Expect.equals(actual, expected, message);
+}
+void assertTrue(actual, [String message = null]) { Expect.isTrue(actual, message); }
+void assertFalse(actual, [String message = null]) { Expect.isFalse(actual, message); }
+void assertThrows(fn, [num testid = null]) {
+  Expect.throws(fn, null, "Test $testid failed");

[Lasse Reichstein Nielsen, 2014/10/29 11:25:31]

Don't need to say "failed" here, this message is only written if the expectation
fails, so the failure type will be part of the full message.

[zerny-google, 2014/10/30 11:31:28]

Done.

+}
+void assertNull(actual, [num testid = null]) {
+  Expect.isNull(actual, "Test $testid failed");
+}
+
+void assertToStringEquals(str, match, num testid) {
+  var actual = [];
+  for (int i = 0; i <= match.groupCount; i++) {
+    actual.add(match.group(i));

[Lasse Reichstein Nielsen, 2014/10/29 11:25:31]

You can convert null to "" here, and avoid the "map" below.
It's also OK as is.

[zerny-google, 2014/10/30 11:31:28]

Done.

+  }
+
+  Expect.equals(str,
+                actual.map((s) => (s == null) ? "" : s).join(","),
+                "Test $testid failed");
+}
+
+void shouldBeTrue(actual) { Expect.isTrue(actual); }
+void shouldBeFalse(actual) { Expect.isFalse(actual); }
+void shouldBeNull(actual) { Expect.isNull(actual); }
+
+void shouldBe(actual, expected, [String message = null]) {
+  if (expected == null) {
+    Expect.isNull(actual, message);
+  } else {
+    Expect.equals(expected.length, actual.groupCount + 1);
+    for (int i = 0; i <= actual.groupCount; i++) {
+      Expect.equals(expected[i], actual.group(i), message);
+    }
+  }
+}
+
+Match firstMatch(String str, RegExp pattern) => pattern.firstMatch(str);
+List<String> allStringMatches(String str, RegExp pattern) =>
+    pattern.allMatches(str).map((Match m) => m.group(0)).toList();
+
+void description(str) { }