improve expect_data; remove assert on "date" column dtype

Author: KevsterAmp

pandas/tests/io/test_common.py

@@ -683,10 +683,8 @@ def test_pyarrow_read_csv_datetime_dtype():
     result = pd.read_csv(
         StringIO(data), parse_dates=["date"], dayfirst=True, dtype_backend="pyarrow"
     )
-    expect_data = pd.Series(
-        pd.to_datetime(["20/12/2025", pd.NaT, "31/12/2020"], dayfirst=True)
-    )
+
+    expect_data = pd.to_datetime(["20/12/2025", pd.NaT, "31/12/2020"], dayfirst=True)
     expect = pd.DataFrame({"date": expect_data})
 
-    assert (result["date"].dtype) == "datetime64[s]"
     tm.assert_frame_equal(expect, result)