Tests on Windows falsely positive reporting passed due to SIGINT handling

[huweiATgithub]

Bug report

Required Info:

• Operating System: Windows
• Installation type: Binary through Robostack/ms-iot
• Version or commit hash: humble
• DDS implementation: the default bundled one
• Client library (if applicable): rclcpp

Steps to reproduce issue

1. Write a launch file in Python to launch one or more nodes.
2. Write a gtest executable (for communication) that exit with code 1.
3. build and test with rostest and launch_testing.asserts.assertExitCodes:

    @pytest.mark.rostest
    def generate_test_description():
        return (
            LaunchDescription(
                [...]
            ),
            {...: ...},
        )
    
    @launch_testing.post_shutdown_test()
    class TestOutcome(unittest.TestCase):
        def test_exit_codes(self, proc_info):
            launch_testing.asserts.assertExitCodes(proc_info)
   

Expected behavior

Failures are reported through assertExitCodes with a non-zero exit code.

Actual behavior

The test passes.

Additional information

This is related to #94 which sends SIGTERM (it is stated that SIGINT is not supported in Windows).
Besides, exit_code=1 is allowed in

launch/launch_testing/launch_testing/asserts/assert_exit_codes.py

Lines 34 to 39 in d9ffd80

	# TODO(hidmic): Drop when SIGINT is fixed on Windows
	EXIT_FORCED = 1
	def assertExitCodes(proc_info,
	allowable_exit_codes=[EXIT_OK] if os.name != 'nt' else [EXIT_OK, EXIT_FORCED],

Ask for help

• Are there any available workarounds for writing tests on Windows?
• Which component fails to handle SIGINT on Windows: the launch service or ROS2 executors?

@hidmic Do you have some information? (I notice the TODO are assigned to you.)

[fujitatomoya]

Write a gtest executable (for communication) that exit with code 1.
Are there any available workarounds for writing tests on Windows?

can you try exit code with different values like 2 or something else, to see if the test completes as expected?