Replace the existing unittest APIs with the new runner infrastructure.

test/matcher/prints_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.
+
+import 'dart:async';
+
+import 'package:unittest/unittest.dart';
+
+import '../utils.dart';
+
+void main() {
+  group("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", () {
+      return runTest(() {
+        expect(() => print("Hello, world!"), prints("Goodbye, world!\n"));
+      }).then((liveTest) {
+        expectTestFailed(liveTest,
+            "Expected: prints 'Goodbye, world!\\n'\n"
+            "  ''\n"
+            "  Actual: <Closure: () => dynamic>\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''\n"
+            "   Which: is different.\n"
+            "Expected: Goodbye, w ...\n"
+            "  Actual: Hello, wor ...\n"
+            "          ^\n"
+            " Differ at offset 0\n");
+      });
+    });
+
+    test("describes a failure with a non-descriptive Matcher nicely", () {
+      return runTest(() {
+        expect(() => print("Hello, world!"), prints(contains("Goodbye")));
+      }).then((liveTest) {
+        expectTestFailed(liveTest,
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <Closure: () => dynamic>\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''\n");
+      });
+    });
+
+    test("describes a failure with no text nicely", () {
+      return runTest(() {
+        expect(() {}, prints(contains("Goodbye")));
+      }).then((liveTest) {
+        expectTestFailed(liveTest,
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <Closure: () => dynamic>\n"
+            "   Which: printed nothing.\n");
+      });
+    });
+
+    test("with a non-function", () {
+      return runTest(() {
+        expect(10, prints(contains("Goodbye")));
+      }).then((liveTest) {
+        expectTestFailed(liveTest,
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <10>\n");
+      });
+    });
+  });
+
+  group('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", () {
+      return runTest(() {
+        expect(() => new Future(() => print("Hello, world!")),
+            prints("Goodbye, world!\n"));
+      }).then((liveTest) {
+        expectTestFailed(liveTest, startsWith(
+            "Expected: prints 'Goodbye, world!\\n'\n"
+            "  ''\n"
+            "  Actual: <Closure: () => dynamic>\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''\n"
+            "   Which: is different.\n"
+            "Expected: Goodbye, w ...\n"
+            "  Actual: Hello, wor ...\n"
+            "          ^\n"
+            " Differ at offset 0"));
+      });
+    });
+
+    test("describes a failure with a non-descriptive Matcher nicely", () {
+      return runTest(() {
+        expect(() => new Future(() => print("Hello, world!")),
+            prints(contains("Goodbye")));
+      }).then((liveTest) {
+        expectTestFailed(liveTest, startsWith(
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <Closure: () => dynamic>\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''"));
+      });
+    });
+
+    test("describes a failure with no text nicely", () {
+      return runTest(() {
+        expect(() => new Future.value(), prints(contains("Goodbye")));
+      }).then((liveTest) {
+        expectTestFailed(liveTest, startsWith(
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <Closure: () => dynamic>\n"
+            "   Which: printed nothing."));
+      });
+    });
+
+    test("won't let the test end until the Future completes", () {
+      return expectTestBlocks(() {
+        var completer = new Completer();
+        expect(() => completer.future, prints(isEmpty));
+        return completer;
+      }, (completer) => completer.complete());
+    });
+  });
+}