# Subset of nose tools (the parts included have not been modified)
# Borrowed from:
# https://raw.githubusercontent.com/nose-devs/nose/7c26ad1e6b7d308cafa328ad34736d34028c122a/nose/tools/nontrivial.py
# Copyright (c) 2005-2009 Jason Pellerin and others.
# This program is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St,
# Fifth Floor, Boston, MA 02110-1301 USA

"""Tools not exempt from being descended into in tracebacks"""

import six

def make_decorator(func):
    Wraps a test decorator so as to properly replicate metadata
    of the decorated function, including nose's additional stuff
    (namely, setup and teardown).
    def decorate(newfunc):
        if hasattr(func, 'compat_func_name'):
            name = func.compat_func_name
            name = func.__name__
        newfunc.__dict__ = func.__dict__
        newfunc.__doc__ = func.__doc__
        newfunc.__module__ = func.__module__
        if not hasattr(newfunc, 'compat_co_firstlineno'):
            newfunc.compat_co_firstlineno = six.get_function_code(func).co_firstlineno
            newfunc.__name__ = name
        except TypeError:
            # can't set func name in 2.3
            newfunc.compat_func_name = name
        return newfunc
    return decorate

def raises(*exceptions):
    """Test must raise one of expected exceptions to pass.

    Example use::

      @raises(TypeError, ValueError)
      def test_raises_type_error():
          raise TypeError("This test passes")

      def test_that_fails_by_passing():

    If you want to test many assertions about exceptions in a single test,
    you may want to use `assert_raises` instead.
    valid = ' or '.join([e.__name__ for e in exceptions])
    def decorate(func):
        name = func.__name__
        def newfunc(*arg, **kw):
                func(*arg, **kw)
            except exceptions:
                message = "%s() did not raise %s" % (name, valid)
                raise AssertionError(message)
        newfunc = make_decorator(func)(newfunc)
        return newfunc
    return decorate