Function test_file_amend

tests/test_magic.py:1374–1401

%%writefile -a amends files

()

def test_file_amend():
    """%%writefile -a amends files"""
    ip = get_ipython()
    with TemporaryDirectory() as td:
        fname = os.path.join(td, "file2")
        ip.run_cell_magic(
            "writefile",
            fname,
            "\n".join(
                [
                    "line1",
                    "line2",
                ]
            ),
        )
        ip.run_cell_magic(
            "writefile",
            "-a %s" % fname,
            "\n".join(
                [
                    "line3",
                    "line4",
                ]
            ),
        )
        s = Path(fname).read_text(encoding="utf-8")
        assert "line1\n" in s
        assert "line3\n" in s


def test_file_spaces():