Class _SubTest

Lib/unittest/case.py:1595–1628

class _SubTest(TestCase):

    def __init__(self, test_case, message, params):
        super().__init__()
        self._message = message
        self.test_case = test_case
        self.params = params
        self.failureException = test_case.failureException

    def runTest(self):
        raise NotImplementedError("subtests cannot be run directly")

    def _subDescription(self):
        parts = []
        if self._message is not _subtest_msg_sentinel:
            parts.append("[{}]".format(self._message))
        if self.params:
            params_desc = ', '.join(
                "{}={!r}".format(k, v)
                for (k, v) in self.params.items())
            parts.append("({})".format(params_desc))
        return " ".join(parts) or '(<subtest>)'

    def id(self):
        return "{} {}".format(self.test_case.id(), self._subDescription())

    def shortDescription(self):
        """Returns a one-line description of the subtest, or None if no
        description has been provided.
        """
        return self.test_case.shortDescription()

    def __str__(self):
        return "{} {}".format(self.test_case, self._subDescription())