rewrite tests using tz_aware_fixture

Author: arw2019

pandas/tests/io/pytables/test_timezones.py

@@ -296,8 +296,11 @@ def test_timezones_fixed_format_frame_non_empty(setup_path):
         tm.assert_frame_equal(result, df)
 
 
-@pytest.mark.parametrize("dtype", ["datetime64[ns, UTC]", "datetime64[ns, US/Eastern]"])
-def test_timezones_fixed_format_frame_empty(setup_path, dtype):
+def test_timezones_fixed_format_frame_empty(setup_path, tz_aware_fixture):
+    # GH 20594
+
+    dtype = pd.DatetimeTZDtype(tz=tz_aware_fixture)
+
     with ensure_clean_store(setup_path) as store:
         s = Series(dtype=dtype)
         df = DataFrame({"A": s})
@@ -306,17 +309,23 @@ def test_timezones_fixed_format_frame_empty(setup_path, dtype):
         tm.assert_frame_equal(result, df)
 
 
-@pytest.mark.parametrize("dtype", ["datetime64[ns, UTC]", "datetime64[ns, US/Eastern]"])
-def test_timezones_fixed_format_series_nonempty(setup_path, dtype):
+def test_timezones_fixed_format_series_nonempty(setup_path, tz_aware_fixture):
+    # GH 20594
+
+    dtype = pd.DatetimeTZDtype(tz=tz_aware_fixture)
+
     with ensure_clean_store(setup_path) as store:
         s = Series([0], dtype=dtype)
         store["s"] = s
         result = store["s"]
         tm.assert_series_equal(result, s)
 
 
-@pytest.mark.parametrize("dtype", ["datetime64[ns, UTC]", "datetime64[ns, US/Eastern]"])
-def test_timezones_fixed_format_series_empty(setup_path, dtype):
+def test_timezones_fixed_format_series_empty(setup_path, tz_aware_fixture):
+    # GH 20594
+
+    dtype = pd.DatetimeTZDtype(tz=tz_aware_fixture)
+
     with ensure_clean_store(setup_path) as store:
         s = Series(dtype=dtype)
         store["s"] = s