Add a test that server does not send errors when errors have been disabled

pkg/analysis_server/test/integration/analysis/error_test.dart

Index: pkg/analysis_server/test/integration/analysis/error_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/error_test.dart b/pkg/analysis_server/test/integration/analysis/error_test.dart
index 5c4bea4be28d41d396134fcfc0e02cadec086c1a..3d11f4e571e8a549082a8f7795b4e6538d64c871 100644
--- a/pkg/analysis_server/test/integration/analysis/error_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/error_test.dart
@@ -2,6 +2,8 @@
 // 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 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ -11,6 +13,8 @@ import '../integration_tests.dart';
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AnalysisErrorIntegrationTest);
+    defineReflectiveTests(NoAnalysisErrorsIntegrationTest);
+    defineReflectiveTests(NoAnalysisErrorsIntegrationTest_Driver);
   });
 }
 
@@ -97,3 +101,44 @@ abstract class C extends B {
 @reflectiveTest
 class AnalysisErrorIntegrationTest
     extends AbstractAnalysisErrorIntegrationTest {}
+
+@reflectiveTest
+class NoAnalysisErrorsIntegrationTest
+    extends AbstractAnalysisServerIntegrationTest {
+  @override
+  Future startServer(
+          {bool checked: true, int diagnosticPort, int servicesPort}) =>
+      server.start(
+          checked: checked,
+          diagnosticPort: diagnosticPort,
+          enableNewAnalysisDriver: enableNewAnalysisDriver,
+          noErrorNotification: true,
+          servicesPort: servicesPort);
+
+  test_detect_simple_error() {
+    String pathname = sourcePath('test.dart');
+    writeFile(
+        pathname,
+        '''
+main() {
+  print(null) // parse error: missing ';'
+}''');
+    standardAnalysisSetup();
+    return analysisFinished.then((_) {
+      expect(currentAnalysisErrors[pathname], isNull);
+    });
+  }
+}
+
+@reflectiveTest
+class NoAnalysisErrorsIntegrationTest_Driver
+    extends NoAnalysisErrorsIntegrationTest {
+  @override
+  bool get enableNewAnalysisDriver => true;
+
+  @failingTest
+  @override
+  test_detect_simple_error() {
+    return super.test_detect_simple_error();
+  }
+}