diff --git a/java/compiler/impl/testSrc/com/intellij/compiler/BaseCompilerTestCase.java b/java/compiler/impl/testSrc/com/intellij/compiler/BaseCompilerTestCase.java
index 0609009dbf81..4305c37547e5 100644
--- a/java/compiler/impl/testSrc/com/intellij/compiler/BaseCompilerTestCase.java
+++ b/java/compiler/impl/testSrc/com/intellij/compiler/BaseCompilerTestCase.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2016 JetBrains s.r.o.
+ * Copyright 2000-2017 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.
@@ -335,6 +335,7 @@ public abstract class BaseCompilerTestCase extends ModuleTestCase {
     return iprFile;
   }
 
+  @NotNull
   @Override
   protected Module doCreateRealModule(String moduleName) {
     //todo[nik] reuse code from PlatformTestCase
diff --git a/java/java-tests/testSrc/com/intellij/refactoring/IntroduceFieldWitSetUpInitializationTest.java b/java/java-tests/testSrc/com/intellij/refactoring/IntroduceFieldWitSetUpInitializationTest.java
index f2b71328a349..f35843479b31 100644
--- a/java/java-tests/testSrc/com/intellij/refactoring/IntroduceFieldWitSetUpInitializationTest.java
+++ b/java/java-tests/testSrc/com/intellij/refactoring/IntroduceFieldWitSetUpInitializationTest.java
@@ -1,5 +1,17 @@
 /*
- * Copyright (c) 2000-2007 JetBrains s.r.o. All Rights Reserved.
+ * Copyright 2000-2017 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.
  */
 
 /*
@@ -21,6 +33,7 @@ import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.refactoring.introduceField.BaseExpressionToFieldHandler;
 import com.intellij.refactoring.introduceField.LocalToFieldHandler;
 import com.intellij.util.PathUtil;
+import org.jetbrains.annotations.NotNull;
 import org.junit.Before;
 
 import java.io.File;
@@ -31,6 +44,7 @@ public class IntroduceFieldWitSetUpInitializationTest extends CodeInsightTestCas
     return JavaTestUtil.getJavaTestDataPath();
   }
 
+  @NotNull
   @Override
   protected Module createModule(final String name) {
     final Module module = super.createModule(name);
diff --git a/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java b/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java
index 057fa9cbc951..756a9593decd 100644
--- a/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java
+++ b/platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2016 JetBrains s.r.o.
+ * Copyright 2000-2017 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.
@@ -325,25 +325,29 @@ public abstract class PlatformTestCase extends UsefulTestCase implements DataPro
     }.execute().throwException();
   }
 
+  @NotNull
   protected Module createMainModule() throws IOException {
     return createModule(myProject.getName());
   }
 
+  @NotNull
   protected Module createModule(@NonNls final String moduleName) {
     return doCreateRealModule(moduleName);
   }
 
+  @NotNull
   protected Module doCreateRealModule(final String moduleName) {
     return doCreateRealModuleIn(moduleName, myProject, getModuleType());
   }
 
+  @NotNull
   protected static Module doCreateRealModuleIn(String moduleName, final Project project, final ModuleType moduleType) {
     final VirtualFile baseDir = project.getBaseDir();
     assertNotNull(baseDir);
-    String path = baseDir.getPath();
-    return createModuleAt(moduleName, project, moduleType, path);
+    return createModuleAt(moduleName, project, moduleType, baseDir.getPath());
   }
 
+  @NotNull
   protected static Module createModuleAt(String moduleName, Project project, ModuleType moduleType, String path) {
     File moduleFile = new File(FileUtil.toSystemDependentName(path), moduleName + ModuleFileType.DOT_DEFAULT_EXTENSION);
     FileUtil.createIfDoesntExist(moduleFile);
diff --git a/plugins/eclipse/testSources/org/jetbrains/idea/eclipse/Eclipse2ModulesTest.java b/plugins/eclipse/testSources/org/jetbrains/idea/eclipse/Eclipse2ModulesTest.java
index f2b6ca4904d9..bd6dce66a6ca 100644
--- a/plugins/eclipse/testSources/org/jetbrains/idea/eclipse/Eclipse2ModulesTest.java
+++ b/plugins/eclipse/testSources/org/jetbrains/idea/eclipse/Eclipse2ModulesTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2017 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.
@@ -55,6 +55,7 @@ public abstract class Eclipse2ModulesTest extends IdeaTestCase {
     copyDirContentsTo(vTestRoot, getProject().getBaseDir());
   }
 
+  @NotNull
   @Override
   protected Module createMainModule() {
     return createModule(DEPEND_MODULE_NAME);