diff --git a/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/CodeInsightTestFixtureImpl.java b/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/CodeInsightTestFixtureImpl.java
index 768df215da7f..545bbf52ab6d 100644
--- a/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/CodeInsightTestFixtureImpl.java
+++ b/platform/testFramework/src/com/intellij/testFramework/fixtures/impl/CodeInsightTestFixtureImpl.java
@@ -166,6 +166,7 @@ public class CodeInsightTestFixtureImpl extends BaseFixture implements CodeInsig
     File fromFile = new File(getTestDataPath() + "/" + sourceFilePath);
     if (!fromFile.exists()) {
       fromFile = new File(sourceFilePath);
+      assert fromFile.exists(): "cannot find " + getTestDataPath() + "/" + sourceFilePath;
     }
 
     if (myTempDirFixture instanceof LightTempDirTestFixtureImpl) {