fix error in pre-commit checks also move my new test to the bottom of the class since it was not put in the right place before

Author: Neal Muppidi

pandas/tests/indexing/test_at.py

@@ -98,20 +98,6 @@ def test_at_setitem_categorical_missing(self):
 
         tm.assert_frame_equal(df, expected)
 
-    @pytest.mark.parametrize("row", (Timestamp("2019-01-01"), "2019-01-01"))
-    def test_at_datetime_index(self, row):
-        df = DataFrame(
-            data=[[1] * 2],
-            index=DatetimeIndex(data=["2019-01-01", "2019-01-02"])
-        )
-        expected = DataFrame(
-            data=[[0.5, 1], [1.0, 1]],
-            index=DatetimeIndex(data=["2019-01-01", "2019-01-02"])
-        )
-
-        df.at[row, 0] = 0.5
-        tm.assert_frame_equal(df, expected)
-
     def test_at_setitem_multiindex(self):
         df = DataFrame(
             np.zeros((3, 2), dtype="int64"),
@@ -124,6 +110,19 @@ def test_at_setitem_multiindex(self):
         )
         tm.assert_frame_equal(df, expected)
 
+    @pytest.mark.parametrize("row", (Timestamp("2019-01-01"), "2019-01-01"))
+    def test_at_datetime_index(self, row):
+        df = DataFrame(
+            data=[[1] * 2], index=DatetimeIndex(data=["2019-01-01", "2019-01-02"])
+        )
+        expected = DataFrame(
+            data=[[0.5, 1], [1.0, 1]],
+            index=DatetimeIndex(data=["2019-01-01", "2019-01-02"]),
+        )
+
+        df.at[row, 0] = 0.5
+        tm.assert_frame_equal(df, expected)
+
 
 class TestAtSetItemWithExpansion:
     def test_at_setitem_expansion_series_dt64tz_value(self, tz_naive_fixture):