Replace the existing unittest APIs with the new runner infrastructure.

test/prints_matcher_test.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.
-
-library unittest.prints_matchers_test;
-
-import 'dart:async';
-
-import 'package:metatest/metatest.dart';
-import 'package:unittest/unittest.dart';
-
-/// The VM and dart2js have different toStrings for closures.
-final closureToString = (() {}).toString();
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  expectTestResults('synchronous', () {
-    test("passes with an expected print", () {
-      expect(() => print("Hello, world!"), prints("Hello, world!\n"));
-    });
-
-    test("combines multiple prints", () {
-      expect(() {
-        print("Hello");
-        print("World!");
-      }, prints("Hello\nWorld!\n"));
-    });
-
-    test("works with a Matcher", () {
-      expect(() => print("Hello, world!"), prints(contains("Hello")));
-    });
-
-    test("describes a failure nicely", () {
-      expect(() => print("Hello, world!"), prints("Goodbye, world!\n"));
-    });
-
-    test("describes a failure with a non-descriptive Matcher nicely", () {
-      expect(() => print("Hello, world!"), prints(contains("Goodbye")));
-    });
-
-    test("describes a failure with no text nicely", () {
-      expect(() {}, prints(contains("Goodbye")));
-    });
-  }, [
-    {'result': 'pass'},
-    {'result': 'pass'},
-    {'result': 'pass'},
-    {
-      'result': 'fail',
-      'message': r'''Expected: prints 'Goodbye, world!\n'
-  ''
-  Actual: <Closure: () => dynamic>
-   Which: printed 'Hello, world!\n'
-  ''
-   Which: is different.
-Expected: Goodbye, w ...
-  Actual: Hello, wor ...
-          ^
- Differ at offset 0
-'''
-    },
-    {
-      'result': 'fail',
-      'message': r'''Expected: prints contains 'Goodbye'
-  Actual: <Closure: () => dynamic>
-   Which: printed 'Hello, world!\n'
-  ''
-'''
-    },
-    {
-      'result': 'fail',
-      'message': r'''Expected: prints contains 'Goodbye'
-  Actual: <Closure: () => dynamic>
-   Which: printed nothing.
-'''
-    }
-  ]);
-
-  expectTestResults('asynchronous', () {
-    test("passes with an expected print", () {
-      expect(() => new Future(() => print("Hello, world!")),
-          prints("Hello, world!\n"));
-    });
-
-    test("combines multiple prints", () {
-      expect(() => new Future(() {
-        print("Hello");
-        print("World!");
-      }), prints("Hello\nWorld!\n"));
-    });
-
-    test("works with a Matcher", () {
-      expect(() => new Future(() => print("Hello, world!")),
-          prints(contains("Hello")));
-    });
-
-    test("describes a failure nicely", () {
-      expect(() => new Future(() => print("Hello, world!")),
-          prints("Goodbye, world!\n"));
-    });
-
-    test("describes a failure with a non-descriptive Matcher nicely", () {
-      expect(() => new Future(() => print("Hello, world!")),
-          prints(contains("Goodbye")));
-    });
-
-    test("describes a failure with no text nicely", () {
-      expect(() => new Future.value(), prints(contains("Goodbye")));
-    });
-  }, [
-    {'result': 'pass'},
-    {'result': 'pass'},
-    {'result': 'pass'},
-    {
-      'result': 'fail',
-      'message': startsWith(r'''Expected future to complete successfully, but it failed with Expected: 'Goodbye, world!\n'
-  ''
-  Actual: 'Hello, world!\n'
-  ''
-   Which: is different.
-Expected: Goodbye, w ...
-  Actual: Hello, wor ...
-          ^
- Differ at offset 0
-''')
-    },
-    {
-      'result': 'fail',
-      'message': startsWith(r'''Expected future to complete successfully, but it failed with Expected: contains 'Goodbye'
-  Actual: 'Hello, world!\n'
-  ''
-''')
-    },
-    {
-      'result': 'fail',
-      'message': startsWith(r'''Expected future to complete successfully, but it failed with Expected: contains 'Goodbye'
-  Actual: ''
-''')
-    }
-  ]);
-}