With a different set of parameters, ``assert_that`` can also verify a
    boolean condition:

    .. function:: assert_that(assertion[, reason])

    :param assertion:  Boolean condition to verify.
    :param reason:  Optional explanation to include in failure description.

    This is equivalent to the :py:meth:`~unittest.TestCase.assertTrue` method
    of :py:class:`unittest.TestCase`, but offers greater flexibility in test
    writing by being a standalone function.

    )