diff --git a/test/data/auth/invalid-command-client.auth-script b/test/data/auth/invalid-command-client.auth-script
new file mode 100644
index 00000000..ac17e7be
--- /dev/null
+++ b/test/data/auth/invalid-command-client.auth-script
@@ -0,0 +1,8 @@
+## this tests that receiving a nonexistent command is handled properly
+## by a client
+
+CLIENT
+EXPECT_COMMAND AUTH
+SEND 'NONEXISTENT_COMMAND foo bar baz blah blah'
+EXPECT_COMMAND ERROR
+EXPECT_STATE WAITING_FOR_INPUT