Analysis server context ID is now specified by the client.

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 388960618645f93dcc52ad37bb0a10e8e311401f..cb63f617b0ac3f7d2e2962771ee595ffcbc197e8 100644
--- a/pkg/analysis_server/test/domain_server_test.dart
+++ b/pkg/analysis_server/test/domain_server_test.dart
@@ -29,24 +29,40 @@ class ServerDomainHandlerTest {
 
     Request createRequest = new Request('0', ServerDomainHandler.CREATE_CONTEXT_METHOD);
     createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, sdkPath);
+    createRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, 'ctx');
     Response response = handler.handleRequest(createRequest);
-    String contextId = response.getResult(ServerDomainHandler.CONTEXT_ID_RESULT);
-    expect(contextId, isNotNull);
+    expect(response.id, equals('0'));
+    expect(response.error, isNull);
+    expect(response.result, isEmpty);
+  }
+  
+  static void createContext_alreadyExists() {
+    AnalysisServer server = new AnalysisServer(new MockServerChannel());
+    ServerDomainHandler handler = new ServerDomainHandler(server);
+
+    Request createRequest = new Request('0', ServerDomainHandler.CREATE_CONTEXT_METHOD);
+    createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, sdkPath);
+    createRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, 'ctx');
+    Response response = handler.handleRequest(createRequest);
+    expect(response.error, isNull);
+    response = handler.handleRequest(createRequest);
+    expect(response.error, isNotNull);
   }
 
   static void deleteContext_alreadyDeleted() {
     AnalysisServer server = new AnalysisServer(new MockServerChannel());
     ServerDomainHandler handler = new ServerDomainHandler(server);
 
+    String contextId = 'ctx';
     Request createRequest = new Request('0', ServerDomainHandler.CREATE_CONTEXT_METHOD);
     createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, sdkPath);
-    Response response = handler.handleRequest(createRequest);
-    String contextId = response.getResult(ServerDomainHandler.CONTEXT_ID_RESULT);
+    createRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, contextId);
+    handler.handleRequest(createRequest);
 
     Request deleteRequest = new Request('0', ServerDomainHandler.DELETE_CONTEXT_METHOD);
     deleteRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, contextId);
-    response = handler.handleRequest(deleteRequest);
-    response = handler.handleRequest(deleteRequest);
+    handler.handleRequest(deleteRequest);
+    Response response = handler.handleRequest(deleteRequest);
     expect(response.id, equals('0'));
     expect(response.error, isNotNull);
   }
@@ -66,14 +82,15 @@ class ServerDomainHandlerTest {
     AnalysisServer server = new AnalysisServer(new MockServerChannel());
     ServerDomainHandler handler = new ServerDomainHandler(server);
 
+    String contextId = 'ctx';
     Request createRequest = new Request('0', ServerDomainHandler.CREATE_CONTEXT_METHOD);
     createRequest.setParameter(ServerDomainHandler.SDK_DIRECTORY_PARAM, sdkPath);
-    Response response = handler.createContext(createRequest);
-    String contextId = response.getResult(ServerDomainHandler.CONTEXT_ID_RESULT);
+    createRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, contextId);
+    handler.createContext(createRequest);
 
     Request deleteRequest = new Request('0', ServerDomainHandler.DELETE_CONTEXT_METHOD);
     deleteRequest.setParameter(ServerDomainHandler.CONTEXT_ID_PARAM, contextId);
-    response = handler.handleRequest(deleteRequest);
+    Response response = handler.handleRequest(deleteRequest);
     expect(response.toJson(), equals({
       Response.ID: '0',
       Response.ERROR: null