Add support for adding/removing pubspec.yaml files.

pkg/analysis_server/test/context_directory_manager_test.dart

Index: pkg/analysis_server/test/context_directory_manager_test.dart
diff --git a/pkg/analysis_server/test/context_directory_manager_test.dart b/pkg/analysis_server/test/context_directory_manager_test.dart
index a1cb1cdfb3c21cff9a951a2b79a91ca064c6e112..3e11bc391dbdd7791390091958fbac413531bfe3 100644
--- a/pkg/analysis_server/test/context_directory_manager_test.dart
+++ b/pkg/analysis_server/test/context_directory_manager_test.dart
@@ -189,6 +189,16 @@ main() {
         });
       });
 
+      test('Add pubspec file', () {
+        manager.setRoots(<String>[projPath], <String>[]);
+        String pubspecPath = posix.join(projPath, 'pubspec.yaml');
+        expect(manager.currentContextPubspecPaths[projPath], isNull);
+        provider.newFile(pubspecPath, 'pubspec');
+        return pumpEventQueue().then((_) {
+          expect(manager.currentContextPubspecPaths[projPath], equals(pubspecPath));
+        });
+      });
+
       test('Delete file', () {
         String filePath = posix.join(projPath, 'foo.dart');
         provider.newFile(filePath, 'contents');
@@ -200,6 +210,17 @@ main() {
         return pumpEventQueue().then((_) => expect(filePaths, hasLength(0)));
       });
 
+      test('Delete pubspec file', () {
+        String pubspecPath = posix.join(projPath, 'pubspec.yaml');
+        provider.newFile(pubspecPath, 'pubspec');
+        manager.setRoots(<String>[projPath], <String>[]);
+        expect(manager.currentContextPubspecPaths[projPath], equals(pubspecPath));
+        provider.deleteFile(pubspecPath);
+        return pumpEventQueue().then((_) {
+          expect(manager.currentContextPubspecPaths[projPath], isNull);
+        });
+      });
+
       test('Modify file', () {
         String filePath = posix.join(projPath, 'foo.dart');
         provider.newFile(filePath, 'contents');