Rewrite doctest as unit test

README.md

@@ -109,3 +109,5 @@ Contributions welcome:
   [admin pages](https://cylc.github.io/cylc-admin/#change-proposals).
 * Touch base in the
   [developers chat](https://matrix.to/#/#cylc-general:matrix.org).
+
+This repository contains some code that was generated by GitHub Copilot.

cylc/flow/timer.py

@@ -26,59 +26,7 @@
 
 
 class Timer:
-    """Simple timer class for workflow timers.
-
-    Examples:
-        >>> from time import sleep
-
-        # Patch LOG.warning to capture warning messages
-        >>> warnings = []
-        >>> orig_log_warning = LOG.warning
-        >>> LOG.warning = lambda msg: warnings.append(msg)
-
-        >>> timer = Timer("bob timeout", 1.0)
-
-        # timer attributes
-        >>> timer.name
-        'bob timer'
-        >>> timer.interval
-        'PT1S'
-
-        # start timer
-        >>> timer.reset()
-        >>> warnings[-1]
-        'PT1S bob timer starts NOW'
-
-        # check timeout
-        >>> sleep(2)
-        >>> timer.timed_out()
-        True
-        >>> warnings[-1]
-        'bob timer timed out after PT1S'
-
-        # stop should do nothing after timeou
-        >>> warnings = []
-        >>> timer.stop()
-        >>> warnings
-        []
-
-        # start timer again, then stop it
-        >>> timer.reset()
-        >>> warnings[-1]
-        'PT1S bob timer starts NOW'
-        >>> timer.stop()
-        >>> warnings[-1]
-        'bob timer stopped'
-
-        # another stop should do nothing
-        >>> warnings = []
-        >>> timer.stop()
-        >>> warnings
-        []
-
-        # Un-patch LOG.warning to avoid breaking subsequent unit tests!
-        >>> LOG.warning = orig_log_warning
-    """
+    """Simple timer class for workflow timers."""
 
     def __init__(
         self, name: str, interval: float,

tests/unit/test_timer.py

@@ -0,0 +1,56 @@
+# 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/>.
+
+from time import sleep
+
+import pytest
+
+from cylc.flow.timer import Timer
+
+
+def test_Timer(caplog: pytest.LogCaptureFixture):
+    """Test the Timer class."""
+    caplog.set_level('WARNING')
+    timer = Timer("bob timeout", 1.0)
+
+    # timer attributes
+    assert timer.name == "bob timer"
+    assert timer.interval == "PT1S"
+
+    # start timer
+    timer.reset()
+    assert caplog.records[-1].message == "PT1S bob timer starts NOW"
+
+    # check timeout
+    sleep(2)
+    assert timer.timed_out()
+    assert caplog.records[-1].message == "bob timer timed out after PT1S"
+
+    # stop should do nothing after timeout
+    caplog.clear()
+    timer.stop()
+    assert not caplog.records
+
+    # start timer again, then stop it
+    timer.reset()
+    assert caplog.records[-1].message == "PT1S bob timer starts NOW"
+    timer.stop()
+    assert caplog.records[-1].message == "bob timer stopped"
+
+    # another stop should do nothing
+    caplog.clear()
+    timer.stop()
+    assert not caplog.records