Function test_file_var_expand

tests/test_magic.py:1332–1350

%%writefile $filename

()

def test_file_var_expand():
    """%%writefile $filename"""
    ip = get_ipython()
    with TemporaryDirectory() as td:
        fname = os.path.join(td, "file1")
        ip.user_ns["filename"] = fname
        ip.run_cell_magic(
            "writefile",
            "$filename",
            "\n".join(
                [
                    "line1",
                    "line2",
                ]
            ),
        )
        s = Path(fname).read_text(encoding="utf-8")
        assert "line1\n" in s
        assert "line2" in s


def test_file_unicode():