1 files changed, 16 insertions, 0 deletions
diff --git a/java/java-tests/testSrc/com/intellij/psi/MiscPsiTest.java b/java/java-tests/testSrc/com/intellij/psi/MiscPsiTest.java
index 096547c4f4db..61414ab0b416 100644
--- a/java/java-tests/testSrc/com/intellij/psi/MiscPsiTest.java
+++ b/java/java-tests/testSrc/com/intellij/psi/MiscPsiTest.java
@@ -260,4 +260,20 @@ public class MiscPsiTest extends LightCodeInsightFixtureTestCase {
     assertEquals("some.unknown.Foo<? extends String>", type.getCanonicalText());
   }
 
+  public void testNoPsiModificationsInUncommittedDocument() {
+    final PsiJavaFile file = (PsiJavaFile)myFixture.addFileToProject("a.java", "class A{}");
+    Document document = file.getViewProvider().getDocument();
+    document.insertString(0, " ");
+
+    PsiClass psiClass = file.getClasses()[0];
+    try {
+      psiClass.addBefore(PsiParserFacade.SERVICE.getInstance(getProject()).createWhiteSpaceFromText(" "), psiClass.getLBrace());
+      fail();
+    }
+    catch (IllegalStateException e) {
+      assertEquals("Attempt to modify PSI for non-committed Document!", e.getMessage());
+    }
+    assertEquals("class A{}", psiClass.getText());
+    assertEquals(" class A{}", document.getText());
+  }
 }