self = <ipatests.test_integration.test_cert.TestCAShowErrorHandling object at 0x7fc51f4fbcb0>
    def test_ca_show_error_handling(self):
        """
        Test to verify if the case of a request
        for /ca/rest/authority/{id}/cert (or .../chain)
        where {id} is an unknown authority ID.
        Test Steps:
        1. Setup a freeipa server and a replica
        2. Stop ipa-custodia service on replica
        3. Create a LWCA on the replica
        4. Verify LWCA is recognized on the server
        5. Run `ipa ca-show <LWCA>`
        PKI Github Link: https://github.com/dogtagpki/pki/pull/3605/
        """
        self.replicas[0].run_command(['systemctl', 'stop', 'ipa-custodia'])
        lwca = 'lwca1'
        result = self.replicas[0].run_command([
            'ipa', 'ca-add', lwca, '--subject', 'CN=LWCA 1'
        ])
        assert 'Created CA "{}"'.format(lwca) in result.stdout_text
        result = self.master.run_command(['ipa', 'ca-find'])
        assert 'Name: {}'.format(lwca) in result.stdout_text
        result = self.master.run_command(
            ['ipa', 'ca-show', lwca, ],
            raiseonerr=False
        )
        error_msg = 'ipa: ERROR: The certificate for ' \
                    '{} is not available on this server.'.format(lwca)
>       assert error_msg in result.stderr_text
E       AssertionError: assert 'ipa: ERROR: The certificate for lwca1 is not available on this server.' in 'ipa: ERROR: Request failed with status 500: Non-2xx response from CA REST API: 500. \n'
E        +  where 'ipa: ERROR: Request failed with status 500: Non-2xx response from CA REST API: 500. \n' = <pytest_multihost.transport.SSHCommand object at 0x7fc51dd84980>.stderr_text
test_integration/test_cert.py:558: AssertionError

org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException: Cannot invoke "com.netscape.ca.CASigningUnit.getCert()" because "this.mSigningUnit" is null