sources for deprecate.py [rev. 57595]

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import py

def deprecated_call(func, *args, **kwargs):

    """ assert that calling func(*args, **kwargs)

        triggers a DeprecationWarning.

"""

    warningmodule = py.std.warnings

    l = []

    oldwarn_explicit = getattr(warningmodule, 'warn_explicit')

    def warn_explicit(*args, **kwargs):

        l.append(args)

        oldwarn_explicit(*args, **kwargs)

    oldwarn = getattr(warningmodule, 'warn')

    def warn(*args, **kwargs):

        l.append(args)

        oldwarn(*args, **kwargs)

    warningmodule.warn_explicit = warn_explicit

    warningmodule.warn = warn

    try:

        ret = func(*args, **kwargs)

    finally:

        warningmodule.warn_explicit = warn_explicit

        warningmodule.warn = warn

    if not l:

        print warningmodule

        raise AssertionError("%r did not produce DeprecationWarning" %(func,))

    return ret