ENH: add logging information on when check in test_memoize_path_dir f…

…ails

src/fscacher/tests/test_cache.py

@@ -15,6 +15,9 @@
 on_windows = platform_system == "windows"
 on_pypy = platform.python_implementation().lower() == "pypy"
 
+import logging
+lgr = logging.getLogger(__name__)
+
 
 @pytest.fixture(autouse=True)
 def capture_all_logs(caplog):
@@ -207,7 +210,12 @@ def check_new_memoread(arg, content, expect_new=False):
     except AssertionError:  # pragma: no cover
         # if computer is indeed slow (happens on shared CIs) we might fail
         # because distance is too short
-        if time.time() - t0 < cache._min_dtime:
+        t_now = time.time()
+        if t_now - t0 < cache._min_dtime:
+            # Log more information to troubleshoot
+            lgr.error(f"Failing test with t0={t0}, t_now={t_now}, dt={t_now - t0}, min_dtime={cache._min_dtime}")
+            for p in ("a.txt", "b.txt"):
+                lgr.error(f"   {p}: {op.getmtime(path / p)}")
             raise  # if we were quick but still failed -- legit
     assert calls[-1] == [path, 0, None]