TST: add assertions to check the shape and column levels of the DataFrame when reading an Excel file

Author: Justine Kosinski

pandas/tests/io/excel/test_writers.py

@@ -1522,7 +1522,10 @@ def test_to_excel_multiindex_nan_in_columns(self, merge_cells, tmp_excel):
 
         with ExcelFile(tmp_excel) as reader:
             result = pd.read_excel(reader, index_col=0, header=[0, 1])
-
+        assert result.shape == df.shape
+        assert list(result.index) == list(df.index)
+        assert isinstance(result.columns, MultiIndex)
+        assert result.columns.nlevels == df.columns.nlevels
         tm.assert_numpy_array_equal(result.to_numpy(), df.to_numpy())
 
     @pytest.mark.parametrize("with_index", [True, False])