Add PluginWatcher to watch for new plugins that need to be run

pkg/analysis_server/test/src/plugin/plugin_watcher_test.dart

Index: pkg/analysis_server/test/src/plugin/plugin_watcher_test.dart
diff --git a/pkg/analysis_server/test/src/plugin/plugin_watcher_test.dart b/pkg/analysis_server/test/src/plugin/plugin_watcher_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..27f76c26cb4bdc7211dee8a650ea3b6258aaa04a
--- /dev/null
+++ b/pkg/analysis_server/test/src/plugin/plugin_watcher_test.dart
@@ -0,0 +1,150 @@
+// Copyright (c) 2017, 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 'dart:typed_data';
+
+import 'package:analysis_server/src/plugin/plugin_manager.dart';
+import 'package:analysis_server/src/plugin/plugin_watcher.dart';
+import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/dart/analysis/byte_store.dart';
+import 'package:analyzer/src/dart/analysis/driver.dart';
+import 'package:analyzer/src/dart/analysis/file_state.dart';
+import 'package:analyzer/src/generated/engine.dart' show AnalysisOptionsImpl;
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer_plugin/protocol/protocol_generated.dart';
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../../mock_sdk.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(PluginWatcherTest);
+  });
+}
+
+@reflectiveTest
+class PluginWatcherTest {
+  MemoryResourceProvider resourceProvider;
+  TestPluginManager manager;
+  PluginWatcher watcher;
+
+  void setUp() {
+    resourceProvider = new MemoryResourceProvider();
+    manager = new TestPluginManager();
+    watcher = new PluginWatcher(resourceProvider, manager);
+  }
+
+  test_addedDriver() async {
+    String pkg1Path = resourceProvider.convertPath('/pkg1');
+    ContextRoot contextRoot = new ContextRoot(pkg1Path, []);
+    TestDriver driver = new TestDriver(resourceProvider, contextRoot);
+    watcher.addedDriver(driver, contextRoot);
+    expect(manager.addedContextRoots, isEmpty);
+    //
+    // Test to see whether the listener was configured correctly.
+    //
+    // Use a file in the package being analyzed.
+    //
+    resourceProvider.newFile(
+        resourceProvider.convertPath('/pkg1/lib/test1.dart'), '');
+    await driver.computeResult('package:pkg1/test1.dart');
+    expect(manager.addedContextRoots, isEmpty);
+    //
+    // Use a file that imports a package with a plugin.
+    //
+    resourceProvider.newFile(
+        resourceProvider.convertPath('/pkg2/lib/pkg2.dart'), '');
+    resourceProvider.newFile(
+        resourceProvider.convertPath('/pkg2/pubspec.yaml'), 'name: pkg2');
+    resourceProvider.newFile(
+        resourceProvider
+            .convertPath('/pkg2/tools/analysis_plugin/bin/plugin.dart'),
+        '');
+    await driver.computeResult('package:pkg2/pk2.dart');
+    expect(manager.addedContextRoots, hasLength(1));
+  }
+
+  void test_creation() {
+    expect(watcher.resourceProvider, resourceProvider);
+    expect(watcher.manager, manager);
+  }
+
+  test_removedDriver() {
+    String pkg1Path = resourceProvider.convertPath('/pkg1');
+    ContextRoot contextRoot = new ContextRoot(pkg1Path, []);
+    TestDriver driver = new TestDriver(resourceProvider, contextRoot);
+    watcher.addedDriver(driver, contextRoot);
+    watcher.removedDriver(driver);
+    expect(manager.removedContextRoots, equals([contextRoot]));
+  }
+}
+
+class TestDriver implements AnalysisDriver {
+  final MemoryResourceProvider resourceProvider;
+
+  SourceFactory sourceFactory;
+  FileSystemState fsState;
+
+  final _resultController = new StreamController<AnalysisResult>();
+
+  TestDriver(this.resourceProvider, ContextRoot contextRoot) {
+    path.Context pathContext = resourceProvider.pathContext;
+    MockSdk sdk = new MockSdk(resourceProvider: resourceProvider);
+    String packageName = pathContext.basename(contextRoot.root);
+    String libPath = pathContext.join(contextRoot.root, 'lib');
+    sourceFactory = new SourceFactory([
+      new DartUriResolver(sdk),
+      new PackageMapUriResolver(resourceProvider, {
+        packageName: [resourceProvider.getFolder(libPath)],
+        'pkg2': [
+          resourceProvider.getFolder(resourceProvider.convertPath('/pkg2/lib'))
+        ]
+      })
+    ]);
+    fsState = new FileSystemState(
+        new PerformanceLog(null),
+        new MemoryByteStore(),
+        null,
+        resourceProvider,
+        sourceFactory,
+        new AnalysisOptionsImpl(),
+        new Uint32List(0));
+  }
+
+  Stream<AnalysisResult> get results => _resultController.stream;
+
+  Future<Null> computeResult(String uri) {
+    FileState file = fsState.getFileForUri(Uri.parse(uri));
+    AnalysisResult result = new AnalysisResult(this, null, file.path, null,
+        true, null, null, null, null, null, null, null);
+    _resultController.add(result);
+    return new Future.delayed(new Duration(milliseconds: 1));
+  }
+
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+class TestPluginManager implements PluginManager {
+  List<ContextRoot> addedContextRoots = <ContextRoot>[];
+
+  List<ContextRoot> removedContextRoots = <ContextRoot>[];
+
+  @override
+  Future<Null> addPluginToContextRoot(
+      ContextRoot contextRoot, String path) async {
+    addedContextRoots.add(contextRoot);
+    return null;
+  }
+
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+
+  @override
+  void removedContextRoot(ContextRoot contextRoot) {
+    removedContextRoots.add(contextRoot);
+  }
+}