community.general/test/integration/targets/async/library/async_test.py

import sys
import json
from ansible.module_utils.basic import AnsibleModule

def main():
    if "--interactive" in sys.argv:
        import ansible.module_utils.basic
        ansible.module_utils.basic._ANSIBLE_ARGS = json.dumps(dict(
            ANSIBLE_MODULE_ARGS=dict(
                fail_mode="graceful"
            )
        ))

    module = AnsibleModule(argument_spec = dict(
        fail_mode = dict(type='list', default=['success'])
        )
    )

    result = dict(changed=True)

    fail_mode = module.params['fail_mode']

    try:
        if 'leading_junk' in fail_mode:
            print("leading junk before module output")

        if 'graceful' in fail_mode:
            module.fail_json(msg="failed gracefully")

        if 'exception' in fail_mode:
            raise Exception('failing via exception')

        module.exit_json(**result)

    finally:
        if 'trailing_junk' in fail_mode:
            print("trailing junk after module output")

main()