Upgrade to the most recent test package. (#11526)

Also, add tests to verify that our coverage is actually being tested!

dev/automated_tests/flutter_test/README.md

 The files in this directory are used as part of tests in the
-`flutter_tools` package. They are here because here these tests need a
+`flutter_tools` package. Some are here because here these tests need a
 `pubspec.yaml` that references the flutter framework (which is
-intentionally not true of the `flutter_tools` package).
+intentionally not true of the `flutter_tools` package). Others are
+here mostly out of peer pressure.

dev/automated_tests/flutter_test/trivial_test.dart

+// Copyright 2017 The Chromium Authors. 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:test/test.dart';
+
+void main() {
+  test('trivial', () { });
+}

dev/bots/test.dart

@@ -145,9 +145,23 @@ Future<Null> _runCoverage() async {
     return;
   }
 
+  final File coverageFile = new File(path.join(flutterRoot, 'packages', 'flutter', 'coverage', 'lcov.info'));
+  if (!coverageFile.existsSync()) {
+    print('${red}Coverage file not found.$reset');
+    print('Expected to find: ${coverageFile.absolute}');
+    print('This file is normally obtained by running `flutter update-packages`.');
+    exit(1);
+  }
+  coverageFile.deleteSync();
   await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter'),
     options: const <String>['--coverage'],
   );
+  if (!coverageFile.existsSync()) {
+    print('${red}Coverage file not found.$reset');
+    print('Expected to find: ${coverageFile.absolute}');
+    print('This file should have been generated by the `flutter test --coverage` script, but was not.');
+    exit(1);
+  }
 
   print('${bold}DONE: Coverage collection successful.$reset');
 }

dev/devicelab/pubspec.yaml

@@ -20,4 +20,4 @@ dependencies:
 
 dev_dependencies:
   # See packages/flutter_test/pubspec.yaml for why we're pinning this version.
-  test: 0.12.21
+  test: 0.12.24+2

packages/flutter_driver/pubspec.yaml

@@ -21,6 +21,6 @@ dependencies:
     sdk: flutter
 
 dev_dependencies:
-  test: 0.12.21
+  test: any # pinned by flutter_test
   mockito: ^2.0.2
   quiver: ^0.24.0

packages/flutter_test/pubspec.yaml

@@ -3,8 +3,11 @@ version: 0.0.11-dev
 dependencies:
   # The flutter tools depend on very specific internal implementation
   # details of the 'test' package, which change between versions, so
-  # here we pin it precisely to avoid version skew across our packages.
-  test: 0.12.21
+  # here we pin it precisely to avoid version skew across our
+  # packages. When changing this, also update the pubspec.yaml files
+  # for the flutter_tools and devicelab packages. All other packages
+  # should depend on this one to transitively get the pinned version.
+  test: 0.12.24+2
 
   # We use FakeAsync and other testing utilities.
   quiver: ^0.24.0

packages/flutter_tools/pubspec.yaml

@@ -35,8 +35,11 @@ dependencies:
 
   # We depend on very specific internal implementation details of the
   # 'test' package, which change between versions, so here we pin it
-  # precisely.
-  test: 0.12.21
+  # precisely. When changing this, also update the pubspec.yaml files
+  # for the flutter_test and devicelab packages. All other packages
+  # should depend on flutter_test to transitively get the pinned
+  # version.
+  test: 0.12.24+2
 
   # Version from the vended Dart SDK as defined in `dependency_overrides`.
   analyzer: any

packages/flutter_tools/test/commands/test_test.dart

@@ -47,18 +47,33 @@ void main() {
     testUsingContext('run a test when its name matches a regexp', () async {
       Cache.flutterRoot = '../..';
       final ProcessResult result = await _runFlutterTest('filtering', automatedTestsDirectory, flutterTestDirectory,
-        extraArgs: const <String>["--name", "inc.*de"]);
-      if (!result.stdout.contains("+1: All tests passed"))
-        fail("unexpected output from test:\n\n${result.stdout}\n-- end stdout --\n\n");        
+        extraArgs: const <String>['--name', 'inc.*de']);
+      if (!result.stdout.contains('+1: All tests passed'))
+        fail('unexpected output from test:\n\n${result.stdout}\n-- end stdout --\n\n');
       expect(result.exitCode, 0);
     });
 
     testUsingContext('run a test when its name contains a string', () async {
       Cache.flutterRoot = '../..';
       final ProcessResult result = await _runFlutterTest('filtering', automatedTestsDirectory, flutterTestDirectory,
-        extraArgs: const <String>["--plain-name", "include"]);
-      if (!result.stdout.contains("+1: All tests passed"))
-        fail("unexpected output from test:\n\n${result.stdout}\n-- end stdout --\n\n");        
+        extraArgs: const <String>['--plain-name', 'include']);
+      if (!result.stdout.contains('+1: All tests passed'))
+        fail('unexpected output from test:\n\n${result.stdout}\n-- end stdout --\n\n');
+      expect(result.exitCode, 0);
+    });
+
+    testUsingContext('test runs to completion', () async {
+      Cache.flutterRoot = '../..';
+      final ProcessResult result = await _runFlutterTest('trivial', automatedTestsDirectory, flutterTestDirectory,
+        extraArgs: const <String>['--verbose']);
+      if ((!result.stdout.contains('+1: All tests passed')) ||
+          (!result.stdout.contains('test 0: starting shell process')) ||
+          (!result.stdout.contains('test 0: deleting temporary directory')) ||
+          (!result.stdout.contains('test 0: finished')) ||
+          (!result.stdout.contains('test package returned with exit code 0')))
+        fail('unexpected output from test:\n\n${result.stdout}\n-- end stdout --\n\n');
+      if (result.stderr.isNotEmpty)
+        fail('unexpected error output from test:\n\n${result.stderr}\n-- end stderr --\n\n');
       expect(result.exitCode, 0);
     });
 
@@ -69,7 +84,7 @@ Future<Null> _testFile(String testName, String workingDirectory, String testDire
   final String fullTestExpectation = fs.path.join(testDirectory, '${testName}_expectation.txt');
   final File expectationFile = fs.file(fullTestExpectation);
   if (!expectationFile.existsSync())
-    fail("missing expectation file: $expectationFile");
+    fail('missing expectation file: $expectationFile');
 
   while (_testExclusionLock != null)
     await _testExclusionLock;
@@ -116,13 +131,17 @@ Future<Null> _testFile(String testName, String workingDirectory, String testDire
     expect(exec.stderr, '');
 }
 
-Future<ProcessResult> _runFlutterTest(String testName, String workingDirectory, String testDirectory,
-  {List<String> extraArgs = const <String>[]}) async {
-    
+Future<ProcessResult> _runFlutterTest(
+  String testName,
+  String workingDirectory,
+  String testDirectory, {
+  List<String> extraArgs: const <String>[],
+}) async {
+
   final String testFilePath = fs.path.join(testDirectory, '${testName}_test.dart');
   final File testFile = fs.file(testFilePath);
   if (!testFile.existsSync())
-    fail("missing test file: $testFile");
+    fail('missing test file: $testFile');
 
   final List<String> args = <String>[
     fs.path.absolute(fs.path.join('bin', 'flutter_tools.dart')),