diff --git a/platform/testFramework/src/com/intellij/testFramework/fixtures/TempDirTestFixture.java b/platform/testFramework/src/com/intellij/testFramework/fixtures/TempDirTestFixture.java
index dd2ffcc03a7a..faa86b4415ee 100644
--- a/platform/testFramework/src/com/intellij/testFramework/fixtures/TempDirTestFixture.java
+++ b/platform/testFramework/src/com/intellij/testFramework/fixtures/TempDirTestFixture.java
@@ -28,7 +28,7 @@ import java.io.IOException;
  */
 public interface TempDirTestFixture extends IdeaTestFixture {
 
-  VirtualFile copyFile(VirtualFile file, String targetPath);
+  VirtualFile copyFile(@NotNull VirtualFile file, String targetPath);
 
   VirtualFile copyAll(String dataDir, String targetDir);
 
diff --git a/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/LightTempDirTestFixtureImpl.java b/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/LightTempDirTestFixtureImpl.java
index ad0934eb4242..9a9aefddc574 100644
--- a/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/LightTempDirTestFixtureImpl.java
+++ b/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/LightTempDirTestFixtureImpl.java
@@ -54,7 +54,7 @@ public class LightTempDirTestFixtureImpl extends BaseFixture implements TempDirT
   }
 
   @Override
-  public VirtualFile copyFile(final VirtualFile file, final String targetPath) {
+  public VirtualFile copyFile(@NotNull final VirtualFile file, final String targetPath) {
     final String path = PathUtil.getParentPath(targetPath);
     return ApplicationManager.getApplication().runWriteAction(new Computable<VirtualFile>() {
       @Override
diff --git a/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/TempDirTestFixtureImpl.java b/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/TempDirTestFixtureImpl.java
index 0ed70e8aca83..c0d4a4176917 100644
--- a/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/TempDirTestFixtureImpl.java
+++ b/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/TempDirTestFixtureImpl.java
@@ -40,7 +40,7 @@ public class TempDirTestFixtureImpl extends BaseFixture implements TempDirTestFi
   private File myTempDir;
 
   @Override
-  public VirtualFile copyFile(VirtualFile file, String targetPath) {
+  public VirtualFile copyFile(@NotNull VirtualFile file, String targetPath) {
     try {
       createTempDirectory();
       VirtualFile tempDir =