# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""Utilities for unit tests."""

import functools
import nose


class skip_test(object):
    """Decorator that skips a test."""
    # TODO(tr3buchet): remember forever what comstud did here
    def __init__(self, msg):
        self.message = msg

    def __call__(self, func):
        @functools.wraps(func)
        def _skipper(*args, **kw):
            """Wrapped skipper function."""
            raise nose.SkipTest(self.message)
        return _skipper


class skip_if(object):
    """Decorator that skips a test if condition is true."""
    def __init__(self, condition, msg):
        self.condition = condition
        self.message = msg

    def __call__(self, func):
        @functools.wraps(func)
        def _skipper(*args, **kw):
            """Wrapped skipper function."""
            if self.condition:
                raise nose.SkipTest(self.message)
            func(*args, **kw)
        return _skipper


class skip_unless(object):
    """Decorator that skips a test if condition is not true."""
    def __init__(self, condition, msg):
        self.condition = condition
        self.message = msg

    def __call__(self, func):
        @functools.wraps(func)
        def _skipper(*args, **kw):
            """Wrapped skipper function."""
            if not self.condition:
                raise nose.SkipTest(self.message)
            func(*args, **kw)
        return _skipper