TST: Fix trailing current date zeros flaky test_format problem

closes pandas-dev#14626 Author: Mykola Golubyev <Mykola.Golubyev@twosigma.com> Closes pandas-dev#14638 from MykolaGolubyev/issue-14626 and squashes the following commits: 166ec23 [Mykola Golubyev] Inline datetime_now_without_trailing_zeros within test_format 68a72a7 [Mykola Golubyev] Fix trailing current date zeros flaky test_format problem

Author: MykolaGolubyev

pandas/tests/indexes/test_base.py

@@ -913,7 +913,19 @@ def test_summary(self):
  def test_format(self):
  self._check_method_works(Index.format)
 
- index = Index([datetime.now()])
+ # GH 14626
+ # our formatting is different by definition when we have
+ # ms vs us precision (e.g. trailing zeros);
+ # so don't compare this case
+ def datetime_now_without_trailing_zeros():
+ now = datetime.now()
+
+ while str(now).endswith("000"):
+ now = datetime.now()
+
+ return now
+
+ index = Index([datetime_now_without_trailing_zeros()])
 
  # windows has different precision on datetime.datetime.now (it doesn't
  # include us since the default for Timestamp shows these but Index