new_contents: import lldb
  from lldbsuite.test.lldbtest import *
  from lldbsuite.test.decorators import *
  
  class InvalidArgsExpressionTestCase(TestBase):
  
      mydir = TestBase.compute_mydir(__file__)
  
      def setUp(self):
          TestBase.setUp(self)
  
      @no_debug_info_test
      def test_invalid_lang(self):
          self.expect("expression -l foo --", error=True,
                      substrs=["error: unknown language type: 'foo' for expression"])
  
      @no_debug_info_test
      def test_invalid_all_thread(self):
          self.expect("expression -a foo --", error=True,
                      substrs=['error: invalid all-threads value setting: "foo"'])
  
      @no_debug_info_test
      def test_invalid_ignore_br(self):
          self.expect("expression -i foo --", error=True,
                      substrs=['error: could not convert "foo" to a boolean value.'])
  
      @no_debug_info_test
      def test_invalid_allow_jit(self):
          self.expect("expression -j foo --", error=True,
                      substrs=['error: could not convert "foo" to a boolean value.'])
  
      @no_debug_info_test
      def test_invalid_timeout(self):
          self.expect("expression -t foo --", error=True,
                      substrs=['error: invalid timeout setting "foo"'])
  
          self.expect("expression -t \"\" --", error=True,
                      substrs=['error: invalid timeout setting ""'])
  
      @no_debug_info_test
      def test_invalid_unwind(self):
          self.expect("expression -u foo --", error=True,
                      substrs=['error: could not convert "foo" to a boolean value.'])
  
      @no_debug_info_test
      def test_invalid_fixits(self):
          self.expect("expression -X foo --", error=True,
                      substrs=['error: could not convert "foo" to a boolean value.'])
  
subject: Add test for invalid expression command args