testing.py 文件源码

def assert_no_warnings(func, *args, **kw):
    # XXX: once we may depend on python >= 2.6, this can be replaced by the

    # warnings module context manager.
    # very important to avoid uncontrolled state propagation
    clean_warning_registry()
    with warnings.catch_warnings(record=True) as w:
        warnings.simplefilter('always')

        result = func(*args, **kw)
        if hasattr(np, 'VisibleDeprecationWarning'):
            # Filter out numpy-specific warnings in numpy >= 1.9
            w = [e for e in w
                 if e.category is not np.VisibleDeprecationWarning]

        if len(w) > 0:
            raise AssertionError("Got warnings when calling %s: %s"
                                 % (func.__name__, w))
    return result