Create summary files in MockSdk classes

pkg/analysis_server/test/domain_diagnostic_test.dart

Index: pkg/analysis_server/test/domain_diagnostic_test.dart
diff --git a/pkg/analysis_server/test/domain_diagnostic_test.dart b/pkg/analysis_server/test/domain_diagnostic_test.dart
index 78080e86369c7b77641d3a077ab8d0e99880e9c8..d24dea7ce8998366eed333d4e0fa704425fe801d 100644
--- a/pkg/analysis_server/test/domain_diagnostic_test.dart
+++ b/pkg/analysis_server/test/domain_diagnostic_test.dart
@@ -24,21 +24,20 @@ main() {
   DiagnosticDomainHandler handler;
   MemoryResourceProvider resourceProvider;
 
-  setUp(() {
-    //
-    // Collect plugins
-    //
-    ServerPlugin serverPlugin = new ServerPlugin();
+  void processRequiredPlugins(ServerPlugin serverPlugin) {
     List<Plugin> plugins = <Plugin>[];
     plugins.addAll(AnalysisEngine.instance.requiredPlugins);
     plugins.add(AnalysisEngine.instance.commandLinePlugin);
     plugins.add(AnalysisEngine.instance.optionsPlugin);
     plugins.add(serverPlugin);
-    //
-    // Process plugins
-    //
+
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins(plugins);
+  }
+
+  setUp(() {
+    ServerPlugin serverPlugin = new ServerPlugin();
+    processRequiredPlugins(serverPlugin);
     //
     // Create the server
     //