Use the new test runner.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org/1121233007
diff --git a/pubspec.yaml b/pubspec.yaml
index 749bc44..bfb104c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -8,6 +8,6 @@
 dependencies:
   collection: ">=0.9.0 <2.0.0"
 dev_dependencies:
-  unittest: ">=0.9.0 <0.12.0"
+  test: ">=0.12.0 <0.13.0"
 environment:
   sdk: ">=1.0.0 <2.0.0"
diff --git a/test/test_all.dart b/test/test_all.dart
deleted file mode 100644
index 533dde8..0000000
--- a/test/test_all.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// 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 pub_semver.test.test_all;
-
-import 'package:unittest/unittest.dart';
-
-import 'version_constraint_test.dart' as version_constraint_test;
-import 'version_range_test.dart' as version_range_test;
-import 'version_test.dart' as version_test;
-
-main() {
-  group('Version', version_test.main);
-  group('VersionConstraint', version_constraint_test.main);
-  group('VersionRange', version_range_test.main);
-}
diff --git a/test/utils.dart b/test/utils.dart
index d918422..6fefdae 100644
--- a/test/utils.dart
+++ b/test/utils.dart
@@ -4,7 +4,7 @@
 
 library pub_semver.test.utils;
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'package:pub_semver/pub_semver.dart';
 
diff --git a/test/version_constraint_test.dart b/test/version_constraint_test.dart
index ee10a89..b383054 100644
--- a/test/version_constraint_test.dart
+++ b/test/version_constraint_test.dart
@@ -4,7 +4,7 @@
 
 library pub_semver.test.version_constraint_test;
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'package:pub_semver/pub_semver.dart';
 
diff --git a/test/version_range_test.dart b/test/version_range_test.dart
index 388917f..e15539b 100644
--- a/test/version_range_test.dart
+++ b/test/version_range_test.dart
@@ -4,7 +4,7 @@
 
 library pub_semver.test.version_range_test;
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'package:pub_semver/pub_semver.dart';
 
diff --git a/test/version_test.dart b/test/version_test.dart
index 3c652ac..8745006 100644
--- a/test/version_test.dart
+++ b/test/version_test.dart
@@ -4,7 +4,7 @@
 
 library pub_semver.test.version_test;
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'package:pub_semver/pub_semver.dart';