[lldb][NFC] Add test for invalid gui command

llvm-svn: 370647

lldb/packages/Python/lldbsuite/test/commands/gui/invalid-args/TestInvalidArgsGui.py

@@ -0,0 +1,15 @@
+import lldb
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+
+class GuiTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    def setUp(self):
+        TestBase.setUp(self)
+
+    @no_debug_info_test
+    def test_reproducer_generate_invalid_invocation(self):
+        self.expect("gui blub", error=True,
+                    substrs=["the gui command takes no arguments."])