Fix for 'implemented' notification after an incremental change.

pkg/analysis_server/test/analysis/notification_implemented_test.dart

Index: pkg/analysis_server/test/analysis/notification_implemented_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_implemented_test.dart b/pkg/analysis_server/test/analysis/notification_implemented_test.dart
index a26ff5603471288482c86983da1776e425b4796a..6465c3d89a62de7b4b87076a92ffb596e9e73dce 100644
--- a/pkg/analysis_server/test/analysis/notification_implemented_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_implemented_test.dart
@@ -90,16 +90,12 @@ class AnalysisNotificationImplementedTest extends AbstractAnalysisTest {
     return createLocalMemoryIndex();
   }
 
+  /**
+   * Subscribe for `IMPLEMENTED` and wait to the notification.
+   */
   Future prepareImplementedElements() {
-    addAnalysisSubscription(AnalysisService.IMPLEMENTED, testFile);
-    Future waitForNotification(int times) {
-      if (times == 0 || implementedClasses != null) {
-        return new Future.value();
-      }
-      return new Future.delayed(
-          Duration.ZERO, () => waitForNotification(times - 1));
-    }
-    return waitForNotification(100);
+    subscribeForImplemented();
+    return waitForImplementedElements();
   }
 
   void processNotification(Notification notification) {
@@ -117,6 +113,10 @@ class AnalysisNotificationImplementedTest extends AbstractAnalysisTest {
     createProject();
   }
 
+  void subscribeForImplemented() {
+    addAnalysisSubscription(AnalysisService.IMPLEMENTED, testFile);
+  }
+
   test_afterAnalysis() async {
     addTestFile('''
 class A {}
@@ -127,6 +127,26 @@ class B extends A {}
     assertHasImplementedClass('A {');
   }
 
+  test_afterIncrementalResolution() async {
+    subscribeForImplemented();
+    addTestFile('''
+class A {}
+class B extends A {}
+''');
+    await prepareImplementedElements();
+    assertHasImplementedClass('A {');
+    // add a space
+    implementedClasses = null;
+    server.updateContent('1', {
+      testFile: new AddContentOverlay('''
+class A  {}
+class B extends A {}
+''')
+    });
+    await waitForImplementedElements();
+    assertHasImplementedClass('A {');
+  }
+
   test_class_extended() async {
     addTestFile('''
 class A {}
@@ -286,4 +306,15 @@ class B extends A {
     await prepareImplementedElements();
     assertHasImplementedMember('f(_) {} // A');
   }
+
+  Future waitForImplementedElements() {
+    Future waitForNotification(int times) {
+      if (times == 0 || implementedClasses != null) {
+        return new Future.value();
+      }
+      return new Future.delayed(
+          Duration.ZERO, () => waitForNotification(times - 1));
+    }
+    return waitForNotification(100);
+  }
 }