Fix job runner newline.add tests

.mailmap

@@ -57,3 +57,4 @@ Utheri Wagura              <[email protected]>
 github-actions[bot]        <[email protected]>                      <41898282+github-actions[bot]@users.noreply.github.com>
 github-actions[bot]        <[email protected]>  GitHub Action
 Diquan Jabbour             <[email protected]>
+Maxime Rio                 <[email protected]>

tests/integration/test_job_runner_mgr.py

@@ -0,0 +1,85 @@
+# THIS FILE IS PART OF THE CYLC WORKFLOW ENGINE.
+# Copyright (C) NIWA & British Crown (Met Office) & Contributors.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import errno
+import logging
+from pathlib import Path
+import re
+from textwrap import dedent
+
+from cylc.flow.job_runner_mgr import JobRunnerManager
+from cylc.flow.pathutil import get_workflow_run_job_dir
+from cylc.flow.task_state import TASK_STATUS_RUNNING
+from cylc.flow.subprocctx import SubProcContext
+
+
+async def test_kill_error(one, start, test_dir, capsys, log_filter):
+    """It should report the failure to kill a job."""
+    async with start(one) as log:
+        # make it look like the task is running
+        itask = one.pool.get_tasks()[0]
+        itask.submit_num += 1
+        itask.state_reset(TASK_STATUS_RUNNING)
+
+        # fake job details
+        workflow_job_log_dir = Path(get_workflow_run_job_dir(one.workflow))
+        job_id = itask.tokens.duplicate(job='01').relative_id
+        job_log_dir = Path(workflow_job_log_dir, job_id)
+
+        # create job status file (give it a fake pid)
+        job_log_dir.mkdir(parents=True)
+        (job_log_dir / 'job.status').write_text(dedent('''
+            CYLC_JOB_RUNNER_NAME=background
+            CYLC_JOB_ID=99999999
+            CYLC_JOB_PID=99999999
+        '''))
+
+        # attempt to kill the job using the jobs-kill script
+        # (note this is normally run via a subprocess)
+        capsys.readouterr()
+        JobRunnerManager().jobs_kill(str(workflow_job_log_dir), [job_id])
+
+        # the kill should fail, the failure should be written to stdout
+        # (the jobs-kill callback will read this in and handle it)
+        out, err = capsys.readouterr()
+        assert re.search(
+            # # NOTE: ESRCH = no such process
+            rf'TASK JOB ERROR.*{job_id}.*Errno {errno.ESRCH}',
+            out,
+        )
+
+        # feed this jobs-kill output into the scheduler
+        # (as if we had run the jobs-kill script as a subprocess)
+        one.task_job_mgr._kill_task_jobs_callback(
+            # mock the subprocess
+            SubProcContext(
+                one.task_job_mgr.JOBS_KILL,
+                ['mock-cmd'],
+                # provide it with the out/err the script produced
+                out=out,
+                err=err,
+            ),
+            one.workflow,
+            [itask],
+        )
+
+        # a warning should be logged
+        assert log_filter(
+            log,
+            regex=r'1/one/01:running.*job kill failed',
+            level=logging.WARNING,
+        )
+        assert itask.state(TASK_STATUS_RUNNING)