def METHOD_NAME(file, multiline_file):
    # Backup file should NOT be created
    bak_file = "{}.bak".format(multiline_file)
    assert "Salticus" not in multiline_file.read_text()
    file.replace(str(multiline_file), "Etiam", "Salticus", backup=False)
    assert "Salticus" in multiline_file.read_text()
    assert not os.path.exists(bak_file)