diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 40f0953..2a3d66d 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -2544,6 +2544,9 @@
                "  class X x;\n"
                "else\n"
                "  f();\n");
+
+  // This is simply incomplete. Formatting is not important, but must not crash.
+  verifyFormat("class A:"); 
 }
 
 TEST_F(FormatTest, DoNotInterfereWithErrorAndWarning) {