How to use the tavern.core.run_test function in tavern

def test_sleep_after(self, fulltest, mockargs, includes):
        """Should sleep with delay_after in stage spec"""

        fulltest["stages"][0]["delay_after"] = 2

        mock_response = Mock(**mockargs)

        with patch(
            "tavern._plugins.rest.request.requests.Session.request",
            return_value=mock_response,
        ) as pmock:
            with patch("tavern.util.delay.time.sleep") as smock:
                run_test("heif", fulltest, includes)

        assert pmock.called
        smock.assert_called_with(2)

""" Raises error if not defined
        """
        mock_response = Mock(**mockargs)

        stage_includes = []

        newtest = deepcopy(fulltest)
        newtest["includes"] = stage_includes
        newtest["stages"].insert(0, {"type": "ref", "id": "my_external_stage"})

        with pytest.raises(exceptions.InvalidStageReferenceError):
            with patch(
                "tavern._plugins.rest.request.requests.Session.request",
                return_value=mock_response,
            ):
                run_test("heif", newtest, includes)

def test_sleep_before(self, fulltest, mockargs, includes):
        """Should sleep with delay_before in stage spec"""

        fulltest["stages"][0]["delay_before"] = 2

        mock_response = Mock(**mockargs)

        with patch(
            "tavern._plugins.rest.request.requests.Session.request",
            return_value=mock_response,
        ) as pmock:
            with patch("tavern.util.delay.time.sleep") as smock:
                run_test("heif", fulltest, includes)

        assert pmock.called
        smock.assert_called_with(2)

def test_repeats_twice_and_succeeds(self, fulltest, mockargs, includes):
        fulltest["stages"][0]["max_retries"] = 1
        failed_mockargs = deepcopy(mockargs)
        failed_mockargs["status_code"] = 400

        mock_responses = [Mock(**failed_mockargs), Mock(**mockargs)]

        with patch(
            "tavern._plugins.rest.request.requests.Session.request",
            side_effect=mock_responses,
        ) as pmock:
            run_test("heif", fulltest, includes)

        assert pmock.call_count == 2

"""
        mock_response = Mock(**mockargs)

        stage_includes = []

        newtest = deepcopy(fulltest)
        newtest["includes"] = stage_includes
        newtest["stages"].insert(0, {"type": "ref", "id": "my_external_stage"})

        includes["stages"] = fake_stages

        with patch(
            "tavern._plugins.rest.request.requests.Session.request",
            return_value=mock_response,
        ) as pmock:
            run_test("heif", newtest, includes)

        self.check_mocks_called(pmock)

mock_response = Mock(**mockargs)

        stage_includes = [{"stages": fake_stages}]

        newtest = deepcopy(fulltest)
        newtest["includes"] = stage_includes
        newtest["stages"].insert(0, {"type": "ref", "id": "my_external_stage"})

        includes["stages"] = fake_stages

        with pytest.warns(FutureWarning):
            with patch(
                "tavern._plugins.rest.request.requests.Session.request",
                return_value=mock_response,
            ) as pmock:
                run_test("heif", newtest, includes)

        self.check_mocks_called(pmock)

def test_invalid_body(self, fulltest, mockargs, includes):
        """Wrong body returned
        """

        mockargs["json"] = lambda: {"wrong": "thing"}

        mock_response = Mock(**mockargs)

        with patch(
            "tavern._plugins.rest.request.requests.Session.request",
            return_value=mock_response,
        ) as pmock:
            with pytest.raises(exceptions.TestFailError):
                run_test("heif", fulltest, includes)

        assert pmock.called

test responses"""

        env_key = "SPECIAL_CI_MAGIC_COMMIT_TAG"

        fulltest["stages"][0]["request"]["params"] = {
            "a_format_key": "{tavern.env_vars.%s}" % env_key
        }

        mock_response = Mock(**mockargs)

        with patch(
            "tavern._plugins.rest.request.requests.Session.request",
            return_value=mock_response,
        ) as pmock:
            with patch.dict(os.environ, {env_key: "bleuihg"}):
                run_test("heif", fulltest, includes)

        assert pmock.called

mockargs = {
            "spec": paho.MQTTMessage,
            "payload": json.dumps({"echo": sent["message"]}).encode("utf8"),
            "topic": stage["mqtt_publish"]["topic"],
        }
        mock_response = Mock(**mockargs)

        fake_client = MagicMock(
            spec=MQTTClient, message_received=Mock(return_value=mock_response)
        )

        with patch("tavern._plugins.mqtt.client.paho.Client", fake_client), patch(
            "tavern.core.get_extra_sessions", return_value={"paho-mqtt": fake_client}
        ) as pmock:
            run_test("heif", fulltest, includes)

        assert pmock.called

load_plugins(self.global_cfg)

        # INTERNAL
        # NOTE - now that we can 'mark' tests, we could use pytest.mark.xfail
        # instead. This doesn't differentiate between an error in verification
        # and an error when running the test though.
        xfail = self.spec.get("_xfail", False)

        try:
            verify_tests(self.spec)

            fixture_values = self._load_fixture_values()
            self.global_cfg["variables"].update(fixture_values)

            run_test(self.path, self.spec, self.global_cfg)
        except exceptions.BadSchemaError:
            if xfail == "verify":
                logger.info("xfailing test while verifying schema")
            else:
                raise
        except exceptions.TavernException:
            if xfail == "run":
                logger.info("xfailing test when running")
            else:
                raise
        else:
            if xfail:
                logger.error("Expected test to fail")
                raise exceptions.TestFailError(
                    "Expected test to fail at {} stage".format(xfail)
                )