Add integration tests for the execution domain.

pkg/analysis_server/test/integration/execution/map_uri_test.dart

 // 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 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../integration_tests.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(MapUriTest);
     defineReflectiveTests(MapUriTest_Driver);
   });
 }
 
-class AbstractMapUriTest extends AbstractAnalysisServerIntegrationTest {
+abstract class AbstractMapUriTest extends AbstractAnalysisServerIntegrationTest {
   test_mapUri() async {
     String pathname = sourcePath('lib/main.dart');
     writeFile(pathname, '// dummy');
     writeFile(sourcePath('.packages'), 'foo:lib/');
     standardAnalysisSetup();
 
     String contextId =
         (await sendExecutionCreateContext(sourceDirectory.path))?.id;
 
     {
@@ skipping 11 matching lines @@
 }
 
 @reflectiveTest
 class MapUriTest extends AbstractMapUriTest {}
 
 @reflectiveTest
 class MapUriTest_Driver extends AbstractMapUriTest {
   @override
   bool get enableNewAnalysisDriver => true;
 }