Add a test of illegal continuation frames
diff --git a/test/core/bad_client/tests/headers.c b/test/core/bad_client/tests/headers.c
index 1095eca..1d18a82 100644
--- a/test/core/bad_client/tests/headers.c
+++ b/test/core/bad_client/tests/headers.c
@@ -189,6 +189,11 @@
                            "\x00\x00\x00\x01\x00\x00\x00\x00\x01"
                            "\x00\x00\x00\x00\x04\x00\x00\x00\x01",
                            0);
+  /* opening with a continuation frame */
+  GRPC_RUN_BAD_CLIENT_TEST(verifier,
+                           PFX_STR 
+                           "\x00\x00\x00\x09\x04\x00\x00\x00\x01",
+                           0);
 
   return 0;
 }