Fix bad string interpolation in shutdown log message (#395)

* Fix bad string interpolation in shutdown log message * Add test
enthought · Jul 12, 2021 · daaa03c · daaa03c
1 parent 6b1967a
commit daaa03c
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/traits_futures/tests/traits_executor_tests.py b/traits_futures/tests/traits_executor_tests.py
@@ -235,7 +235,7 @@ def test_shutdown_waits_for_background_tasks(self):
     def test_shutdown_timeout(self):
         start_time = time.monotonic()
         with self.long_running_task(self.executor):
-            with self.assertRaises(RuntimeError):
+            with self.assertRaisesRegex(RuntimeError, "1 tasks still running"):
                 self.executor.shutdown(timeout=0.1)
 
         actual_timeout = time.monotonic() - start_time

diff --git a/traits_futures/traits_executor.py b/traits_futures/traits_executor.py
@@ -367,7 +367,7 @@ def shutdown(self, *, timeout=None):
                 # Re-raise with a more user-friendly error message.
                 raise RuntimeError(
                     "Shutdown timed out; "
-                    "f{len(self._wrappers)} tasks still running"
+                    f"{len(self._wrappers)} tasks still running"
                 ) from exc
 
         self._complete_stop()