sult, expected)


@pytest.mark.parametrize(
    "header, expected_data",
    [
        (
            0,
            {
                "Title": [np.nan, "A", 1, 2, 3],
                "Unnamed: 1": [np.nan, "B", 4, 5, 6],
                "Unnamed: 2": [np.nan, "C", 7, 8, 9],
            },
        ),
        (2, {"A": [1, 2, 3], "B": [4, 5, 6], "C": [7, 8, 9]}),
    ],
)
@pytest.mark.parametrize(
    "filename", ["dimension_missing", "dimension_small", "dimension_large"]
)
# When read_only is None, use read_excel instead of a workbook
@pytest.mark.parametrize("read_only", [True, False, None])
def test_read_with_bad_dimension(
    datapath, ext, header, expected_data, filename, read_only
):
    # GH 38956, 39001 - no/incorrect dimension information
    path = datapath("io", "data", "excel", f"{filename}{ext}")
    if read_only is None:
        result = pd.read_excel(path, header=header)
    else:
        with contextlib.closing(
            openpyxl.load_workbook(path, read_only=read_only)
        ) as wb:
            result = pd.read_excel(wb, engine="openpyxl", header=header)
    expected = DataFrame(expected_data)
    tm.assert_frame_equal(result, expected)


def test_append_mode_file(ext):
    # GH 39576
    df = DataFrame()

    with tm.ensure_clean(ext) as f:
        df.to_excel(f, engine="openpyxl")

        with ExcelWriter(
            f, mode="a", engine="openpyxl", if_sheet_exists="new"
        ) as writer:
            df.to_excel(writer)

        # make sure that zip files are not concatenated by making sure that
        # "docProps/app.xml" only occurs twice in the file
        data = Path(f).read_bytes()
        first = data.find(b"docProps/app.xml")
        second = data.find(b"docProps/app.xml", first + 1)
        third = data.find(b"docProps/app.xml", second + 1)
        assert second != -1 and third == -1


# When read_only is None, use read_excel instead of a workbook
@pytest.mark.parametrize("read_only", [True, False, None])
def test_read_wi