TST: Add test for value_counts with Arrow dictionary dtype (#60563)

Author: chilin0525

pandas/tests/extension/test_arrow.py

@@ -3511,3 +3511,20 @@ def test_map_numeric_na_action():
     result = ser.map(lambda x: 42, na_action="ignore")
     expected = pd.Series([42.0, 42.0, np.nan], dtype="float64")
     tm.assert_series_equal(result, expected)
+
+
+def test_categorical_from_arrow_dictionary():
+    # GH 60563
+    df = pd.DataFrame(
+        {"A": ["a1", "a2"]}, dtype=ArrowDtype(pa.dictionary(pa.int32(), pa.utf8()))
+    )
+    result = df.value_counts(dropna=False)
+    expected = pd.Series(
+        [1, 1],
+        index=pd.MultiIndex.from_arrays(
+            [pd.Index(["a1", "a2"], dtype=ArrowDtype(pa.string()), name="A")]
+        ),
+        name="count",
+        dtype="int64",
+    )
+    tm.assert_series_equal(result, expected)