Test framework now allows custom light project setup

platform/testFramework/src/com/intellij/testFramework/LightPlatformTestCase.java

@@ -94,7 +94,8 @@ import com.intellij.psi.impl.source.tree.injected.InjectedLanguageManagerImpl;
 import com.intellij.psi.templateLanguages.TemplateDataLanguageMappings;
 import com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl;
 import com.intellij.util.Consumer;
-import com.intellij.util.GCUtil;import com.intellij.util.IncorrectOperationException;
+import com.intellij.util.GCUtil;
+import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.LocalTimeCounter;
 import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.indexing.FileBasedIndex;
@@ -261,6 +262,12 @@ public abstract class LightPlatformTestCase extends UsefulTestCase implements Da
         ourPsiManager = null;
         ourModule = createMainModule(descriptor.getModuleType());
 
+        if (descriptor instanceof LightProjectDescriptorEx) {
+          ((LightProjectDescriptorEx)descriptor).setupModule(ourModule);
+          
+          if(!((LightProjectDescriptorEx)descriptor).shouldConfigureModule()) return;
+        }
+        
         VirtualFile dummyRoot = VirtualFileManager.getInstance().findFileByUrl("temp:///");
         assert dummyRoot != null;
         dummyRoot.refresh(false, false);

platform/testFramework/src/com/intellij/testFramework/LightProjectDescriptorEx.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2000-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.testFramework;
+
+import com.intellij.openapi.module.Module;
+
+public interface LightProjectDescriptorEx extends LightProjectDescriptor {
+  boolean shouldConfigureModule(); 
+  
+  void setupModule(Module module); 
+}