Apply suggestions from code review [skip ci]

Co-authored-by: Tim Pillinger <26465611+wxtim@users.noreply.github.com>

tests/integration/scripts/test_completion_server.py

@@ -19,10 +19,7 @@
 See also the more extensive unit tests for this module.
 """
 
-from cylc.flow.scripts.completion_server import (
-    _list_prereqs_and_outputs,
-    complete_cylc,
-)
+from cylc.flow.scripts.completion_server import complete_cylc
 
 
 def setify(coro):

tests/integration/test_trigger.py

@@ -37,7 +37,7 @@ async def test_trigger_invalid(mod_one, start, log_filter, flow_strs):
     """Ensure invalid flow values are rejected."""
     async with start(mod_one) as log:
         log.clear()
-        assert mod_one.pool.force_trigger_tasks(['*'], flow_strs) == None
+        assert mod_one.pool.force_trigger_tasks(['*'], flow_strs) is None
         assert len(log_filter(log, level=logging.WARN)) == 1
 
 

tests/unit/scripts/test_completion_server.py

@@ -728,4 +728,6 @@ async def test_prereqs_and_outputs():
     assert await _list_prereqs_and_outputs([]) == ([], [])
 
     # if an invalid workflow is provided, we can't list anything
-    assert await _list_prereqs_and_outputs([Tokens(workflow='no-such-workflow')]) == ([], [])
+    assert await _list_prereqs_and_outputs(
+        [Tokens(workflow='no-such-workflow')]
+    ) == ([], [])