Fix and re-enable analysis server tests that were commented out.

pkg/analysis_server/test/domain_server_test.dart

Index: pkg/analysis_server/test/domain_server_test.dart
diff --git a/pkg/analysis_server/test/domain_server_test.dart b/pkg/analysis_server/test/domain_server_test.dart
index 84e290c4784aff99dc625dc3e4ca3cf43a8ced8b..388960618645f93dcc52ad37bb0a10e8e311401f 100644
--- a/pkg/analysis_server/test/domain_server_test.dart
+++ b/pkg/analysis_server/test/domain_server_test.dart
@@ -13,10 +13,10 @@ import 'mocks.dart';
 
 main() {
   group('ServerDomainHandler', () {
-//    test('createContext', ServerDomainHandlerTest.createContext);
-//    test('deleteContext_alreadyDeleted', ServerDomainHandlerTest.deleteContext_alreadyDeleted);
+    test('createContext', ServerDomainHandlerTest.createContext);
+    test('deleteContext_alreadyDeleted', ServerDomainHandlerTest.deleteContext_alreadyDeleted);
     test('deleteContext_doesNotExist', ServerDomainHandlerTest.deleteContext_doesNotExist);
-//    test('deleteContext_existing', ServerDomainHandlerTest.deleteContext_existing);
+    test('deleteContext_existing', ServerDomainHandlerTest.deleteContext_existing);
     test('shutdown', ServerDomainHandlerTest.shutdown);
     test('version', ServerDomainHandlerTest.version);
   });
@@ -39,7 +39,7 @@ class ServerDomainHandlerTest {
     ServerDomainHandler handler = new ServerDomainHandler(server);
 
     Request createRequest = new Request('0', ServerDomainHandler.CREATE_CONTEXT_METHOD);
-    createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, '');
+    createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, sdkPath);
     Response response = handler.handleRequest(createRequest);
     String contextId = response.getResult(ServerDomainHandler.CONTEXT_ID_RESULT);
 
@@ -47,10 +47,8 @@ class ServerDomainHandlerTest {
     deleteRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, contextId);
     response = handler.handleRequest(deleteRequest);
     response = handler.handleRequest(deleteRequest);
-    expect(response.toJson(), equals({
-      Response.ID: '0',
-      Response.ERROR: 'Context does not exist'
-    }));
+    expect(response.id, equals('0'));
+    expect(response.error, isNotNull);
   }
 
   static void deleteContext_doesNotExist() {
@@ -69,7 +67,7 @@ class ServerDomainHandlerTest {
     ServerDomainHandler handler = new ServerDomainHandler(server);
 
     Request createRequest = new Request('0', ServerDomainHandler.CREATE_CONTEXT_METHOD);
-    createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, '');
+    createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, sdkPath);
     Response response = handler.createContext(createRequest);
     String contextId = response.getResult(ServerDomainHandler.CONTEXT_ID_RESULT);