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import inspect

from superset.utils.pandas_postprocessing import (
    escape_separator,
    pivot,
    unescape_separator,
)


def test_escape_separator():
    assert escape_separator(r" hell \world ") == r" hell \world "
    assert unescape_separator(r" hell \world ") == r" hell \world "

    escape_string = escape_separator("hello, world")
    assert escape_string == r"hello\, world"
    assert unescape_separator(escape_string) == "hello, world"

    escape_string = escape_separator("hello,world")
    assert escape_string == r"hello\,world"
    assert unescape_separator(escape_string) == "hello,world"


def test_validate_column_args_preserves_signature():
    """
    The decorator must not hide the signature of the operation it wraps.

    `inspect.signature` follows `__wrapped__`, which `functools.wraps` sets.
    Without it every decorated operation reports `(df, **options)`, and code
    that inspects the signature -- see `QueryObject._drop_unsupported_options`
    -- cannot tell a supported option from an unsupported one.
    """
    parameters = inspect.signature(pivot).parameters

    assert pivot.__name__ == "pivot"
    assert "options" not in parameters
    assert {"index", "aggregates", "columns"} <= set(parameters)