diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 5b5f483..09fbce8 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -2374,6 +2374,7 @@
                "               const aaaaaaaaaaaaaaaaaaaaa &right) {\n"
                "  return left.group < right.group;\n"
                "}");
+  verifyFormat("SomeType &operator=(const SomeType &S);");
 
   verifyGoogleFormat("operator void*();");
   verifyGoogleFormat("operator SomeType<SomeType<int>>();");