TST: parametrize over dt64 unit (#55974)

* TST: parametrize tests over dt64 unit

* TST: parametrize over unit

* revert

* TST: parametrize over dt64 unit

* xfail non-nano

* revert

pandas/tests/arrays/test_datetimelike.py

@@ -853,10 +853,14 @@ def test_concat_same_type_invalid(self, arr1d):
         with pytest.raises(ValueError, match="to_concat must have the same"):
             arr._concat_same_type([arr, other])
 
-    def test_concat_same_type_different_freq(self):
+    def test_concat_same_type_different_freq(self, unit):
         # we *can* concatenate DTI with different freqs.
-        a = DatetimeArray(pd.date_range("2000", periods=2, freq="D", tz="US/Central"))
-        b = DatetimeArray(pd.date_range("2000", periods=2, freq="h", tz="US/Central"))
+        a = DatetimeArray(
+            pd.date_range("2000", periods=2, freq="D", tz="US/Central", unit=unit)
+        )
+        b = DatetimeArray(
+            pd.date_range("2000", periods=2, freq="h", tz="US/Central", unit=unit)
+        )
         result = DatetimeArray._concat_same_type([a, b])
         expected = DatetimeArray(
             pd.to_datetime(
@@ -866,7 +870,9 @@ def test_concat_same_type_different_freq(self):
                     "2000-01-01 00:00:00",
                     "2000-01-01 01:00:00",
                 ]
-            ).tz_localize("US/Central")
+            )
+            .tz_localize("US/Central")
+            .as_unit(unit)
         )
 
         tm.assert_datetime_array_equal(result, expected)

pandas/tests/groupby/methods/test_nth.py

@@ -286,8 +286,10 @@ def test_nth5():
     tm.assert_frame_equal(gb.nth([3, 4]), df.loc[[]])
 
 
-def test_nth_bdays():
-    business_dates = pd.date_range(start="4/1/2014", end="6/30/2014", freq="B")
+def test_nth_bdays(unit):
+    business_dates = pd.date_range(
+        start="4/1/2014", end="6/30/2014", freq="B", unit=unit
+    )
     df = DataFrame(1, index=business_dates, columns=["a", "b"])
     # get the first, fourth and last two business days for each month
     key = [df.index.year, df.index.month]
@@ -307,7 +309,7 @@ def test_nth_bdays():
             "2014/6/27",
             "2014/6/30",
         ]
-    )
+    ).as_unit(unit)
     expected = DataFrame(1, columns=["a", "b"], index=expected_dates)
     tm.assert_frame_equal(result, expected)
 
@@ -401,14 +403,15 @@ def test_first_last_tz(data, expected_first, expected_last):
         ["last", Timestamp("2013-01-02", tz="US/Eastern"), "b"],
     ],
 )
-def test_first_last_tz_multi_column(method, ts, alpha):
+def test_first_last_tz_multi_column(method, ts, alpha, unit):
     # GH 21603
     category_string = Series(list("abc")).astype("category")
+    dti = pd.date_range("20130101", periods=3, tz="US/Eastern", unit=unit)
     df = DataFrame(
         {
             "group": [1, 1, 2],
             "category_string": category_string,
-            "datetimetz": pd.date_range("20130101", periods=3, tz="US/Eastern"),
+            "datetimetz": dti,
         }
     )
     result = getattr(df.groupby("group"), method)()
@@ -421,6 +424,7 @@ def test_first_last_tz_multi_column(method, ts, alpha):
         },
         index=Index([1, 2], name="group"),
     )
+    expected["datetimetz"] = expected["datetimetz"].dt.as_unit(unit)
     tm.assert_frame_equal(result, expected)
 
 

pandas/tests/groupby/methods/test_quantile.py

@@ -415,36 +415,30 @@ def test_columns_groupby_quantile():
     tm.assert_frame_equal(result, expected)
 
 
-def test_timestamp_groupby_quantile():
+def test_timestamp_groupby_quantile(unit):
     # GH 33168
+    dti = pd.date_range(
+        start="2020-04-19 00:00:00", freq="1min", periods=100, tz="UTC", unit=unit
+    ).floor("1h")
     df = DataFrame(
         {
-            "timestamp": pd.date_range(
-                start="2020-04-19 00:00:00", freq="1min", periods=100, tz="UTC"
-            ).floor("1h"),
+            "timestamp": dti,
             "category": list(range(1, 101)),
             "value": list(range(101, 201)),
         }
     )
 
     result = df.groupby("timestamp").quantile([0.2, 0.8])
 
+    mi = pd.MultiIndex.from_product([dti[::99], [0.2, 0.8]], names=("timestamp", None))
     expected = DataFrame(
         [
             {"category": 12.8, "value": 112.8},
             {"category": 48.2, "value": 148.2},
             {"category": 68.8, "value": 168.8},
             {"category": 92.2, "value": 192.2},
         ],
-        index=pd.MultiIndex.from_tuples(
-            [
-                (pd.Timestamp("2020-04-19 00:00:00+00:00"), 0.2),
-                (pd.Timestamp("2020-04-19 00:00:00+00:00"), 0.8),
-                (pd.Timestamp("2020-04-19 01:00:00+00:00"), 0.2),
-                (pd.Timestamp("2020-04-19 01:00:00+00:00"), 0.8),
-            ],
-            names=("timestamp", None),
-        ),
+        index=mi,
     )
 
     tm.assert_frame_equal(result, expected)

pandas/tests/groupby/methods/test_value_counts.py

@@ -1135,7 +1135,7 @@ def test_subset_duplicate_columns():
 
 
 @pytest.mark.parametrize("utc", [True, False])
-def test_value_counts_time_grouper(utc):
+def test_value_counts_time_grouper(utc, unit):
     # GH#50486
     df = DataFrame(
         {
@@ -1152,12 +1152,12 @@ def test_value_counts_time_grouper(utc):
         }
     ).drop([3])
 
-    df["Datetime"] = to_datetime(df["Timestamp"], utc=utc, unit="s")
+    df["Datetime"] = to_datetime(df["Timestamp"], utc=utc, unit="s").dt.as_unit(unit)
     gb = df.groupby(Grouper(freq="1D", key="Datetime"))
     result = gb.value_counts()
     dates = to_datetime(
         ["2019-08-06", "2019-08-07", "2019-08-09", "2019-08-10"], utc=utc
-    )
+    ).as_unit(unit)
     timestamps = df["Timestamp"].unique()
     index = MultiIndex(
         levels=[dates, timestamps, ["apple", "banana", "orange", "pear"]],

pandas/tests/groupby/test_groupby.py

@@ -3172,28 +3172,32 @@ def test_groupby_selection_other_methods(df):
     )
 
 
-def test_groupby_with_Time_Grouper():
-    idx2 = [
-        to_datetime("2016-08-31 22:08:12.000"),
-        to_datetime("2016-08-31 22:09:12.200"),
-        to_datetime("2016-08-31 22:20:12.400"),
-    ]
+def test_groupby_with_Time_Grouper(unit):
+    idx2 = to_datetime(
+        [
+            "2016-08-31 22:08:12.000",
+            "2016-08-31 22:09:12.200",
+            "2016-08-31 22:20:12.400",
+        ]
+    ).as_unit(unit)
 
     test_data = DataFrame(
         {"quant": [1.0, 1.0, 3.0], "quant2": [1.0, 1.0, 3.0], "time2": idx2}
     )
 
+    time2 = date_range("2016-08-31 22:08:00", periods=13, freq="1min", unit=unit)
     expected_output = DataFrame(
         {
-            "time2": date_range("2016-08-31 22:08:00", periods=13, freq="1min"),
+            "time2": time2,
             "quant": [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
             "quant2": [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
         }
     )
 
-    df = test_data.groupby(Grouper(key="time2", freq="1min")).count().reset_index()
+    gb = test_data.groupby(Grouper(key="time2", freq="1min"))
+    result = gb.count().reset_index()
 
-    tm.assert_frame_equal(df, expected_output)
+    tm.assert_frame_equal(result, expected_output)
 
 
 def test_groupby_series_with_datetimeindex_month_name():

pandas/tests/groupby/test_grouping.py

@@ -276,19 +276,24 @@ def test_grouper_creation_bug2(self):
         result = g.sum()
         tm.assert_frame_equal(result, expected)
 
-    def test_grouper_creation_bug3(self):
+    def test_grouper_creation_bug3(self, unit):
         # GH8866
+        dti = date_range("20130101", periods=2, unit=unit)
+        mi = MultiIndex.from_product(
+            [list("ab"), range(2), dti],
+            names=["one", "two", "three"],
+        )
         ser = Series(
             np.arange(8, dtype="int64"),
-            index=MultiIndex.from_product(
-                [list("ab"), range(2), date_range("20130101", periods=2)],
-                names=["one", "two", "three"],
-            ),
+            index=mi,
         )
         result = ser.groupby(Grouper(level="three", freq="ME")).sum()
+        exp_dti = pd.DatetimeIndex(
+            [Timestamp("2013-01-31")], freq="ME", name="three"
+        ).as_unit(unit)
         expected = Series(
             [28],
-            index=pd.DatetimeIndex([Timestamp("2013-01-31")], freq="ME", name="three"),
+            index=exp_dti,
         )
         tm.assert_series_equal(result, expected)
 

pandas/tests/indexes/datetimes/methods/test_delete.py

@@ -116,37 +116,25 @@ def test_delete_slice(self, unit):
 
     # TODO: belongs in Series.drop tests?
     @pytest.mark.parametrize("tz", [None, "Asia/Tokyo", "US/Pacific"])
-    def test_delete_slice2(self, tz):
+    def test_delete_slice2(self, tz, unit):
+        dti = date_range(
+            "2000-01-01 09:00", periods=10, freq="h", name="idx", tz=tz, unit=unit
+        )
         ts = Series(
             1,
-            index=date_range(
-                "2000-01-01 09:00", periods=10, freq="h", name="idx", tz=tz
-            ),
+            index=dti,
         )
         # preserve freq
         result = ts.drop(ts.index[:5]).index
-        expected = date_range(
-            "2000-01-01 14:00", periods=5, freq="h", name="idx", tz=tz
-        )
+        expected = dti[5:]
         tm.assert_index_equal(result, expected)
         assert result.name == expected.name
         assert result.freq == expected.freq
         assert result.tz == expected.tz
 
         # reset freq to None
         result = ts.drop(ts.index[[1, 3, 5, 7, 9]]).index
-        expected = DatetimeIndex(
-            [
-                "2000-01-01 09:00",
-                "2000-01-01 11:00",
-                "2000-01-01 13:00",
-                "2000-01-01 15:00",
-                "2000-01-01 17:00",
-            ],
-            freq=None,
-            name="idx",
-            tz=tz,
-        )
+        expected = dti[::2]._with_freq(None)
         tm.assert_index_equal(result, expected)
         assert result.name == expected.name
         assert result.freq == expected.freq

pandas/tests/indexes/datetimes/methods/test_repeat.py

@@ -17,29 +17,29 @@ def test_repeat_range(self, tz_naive_fixture):
         assert result.freq is None
         assert len(result) == 5 * len(rng)
 
-    def test_repeat_range2(self, tz_naive_fixture):
+    def test_repeat_range2(self, tz_naive_fixture, unit):
         tz = tz_naive_fixture
-        index = date_range("2001-01-01", periods=2, freq="D", tz=tz)
+        index = date_range("2001-01-01", periods=2, freq="D", tz=tz, unit=unit)
         exp = DatetimeIndex(
             ["2001-01-01", "2001-01-01", "2001-01-02", "2001-01-02"], tz=tz
-        )
+        ).as_unit(unit)
         for res in [index.repeat(2), np.repeat(index, 2)]:
             tm.assert_index_equal(res, exp)
             assert res.freq is None
 
-    def test_repeat_range3(self, tz_naive_fixture):
+    def test_repeat_range3(self, tz_naive_fixture, unit):
         tz = tz_naive_fixture
-        index = date_range("2001-01-01", periods=2, freq="2D", tz=tz)
+        index = date_range("2001-01-01", periods=2, freq="2D", tz=tz, unit=unit)
         exp = DatetimeIndex(
             ["2001-01-01", "2001-01-01", "2001-01-03", "2001-01-03"], tz=tz
-        )
+        ).as_unit(unit)
         for res in [index.repeat(2), np.repeat(index, 2)]:
             tm.assert_index_equal(res, exp)
             assert res.freq is None
 
-    def test_repeat_range4(self, tz_naive_fixture):
+    def test_repeat_range4(self, tz_naive_fixture, unit):
         tz = tz_naive_fixture
-        index = DatetimeIndex(["2001-01-01", "NaT", "2003-01-01"], tz=tz)
+        index = DatetimeIndex(["2001-01-01", "NaT", "2003-01-01"], tz=tz).as_unit(unit)
         exp = DatetimeIndex(
             [
                 "2001-01-01",
@@ -53,17 +53,17 @@ def test_repeat_range4(self, tz_naive_fixture):
                 "2003-01-01",
             ],
             tz=tz,
-        )
+        ).as_unit(unit)
         for res in [index.repeat(3), np.repeat(index, 3)]:
             tm.assert_index_equal(res, exp)
             assert res.freq is None
 
-    def test_repeat(self, tz_naive_fixture):
+    def test_repeat(self, tz_naive_fixture, unit):
         tz = tz_naive_fixture
         reps = 2
         msg = "the 'axis' parameter is not supported"
 
-        rng = date_range(start="2016-01-01", periods=2, freq="30Min", tz=tz)
+        rng = date_range(start="2016-01-01", periods=2, freq="30Min", tz=tz, unit=unit)
 
         expected_rng = DatetimeIndex(
             [
@@ -72,7 +72,7 @@ def test_repeat(self, tz_naive_fixture):
                 Timestamp("2016-01-01 00:30:00", tz=tz),
                 Timestamp("2016-01-01 00:30:00", tz=tz),
             ]
-        )
+        ).as_unit(unit)
 
         res = rng.repeat(reps)
         tm.assert_index_equal(res, expected_rng)