TST: add test for multiindex partial indexing both axis (#27359)

Author: simonjayhawkins

pandas/tests/indexing/multiindex/test_partial.py

@@ -188,3 +188,14 @@ def test_setitem_multiple_partial(self, multiindex_dataframe_random_data):
         expected.loc["foo"] = 0
         expected.loc["bar"] = 0
         tm.assert_series_equal(result, expected)
+
+
+def test_loc_getitem_partial_both_axis():
+    # gh-12660
+    iterables = [["a", "b"], [2, 1]]
+    columns = MultiIndex.from_product(iterables, names=["col1", "col2"])
+    rows = MultiIndex.from_product(iterables, names=["row1", "row2"])
+    df = DataFrame(np.random.randn(4, 4), index=rows, columns=columns)
+    expected = df.iloc[:2, 2:].droplevel("row1").droplevel("col1", axis=1)
+    result = df.loc["a", "b"]
+    tm.assert_frame_equal(result, expected)