How to use the mqttwarn.core.decode_payload function in mqttwarn

def test_decode_payload_alldata(caplog):

    with caplog.at_level(logging.DEBUG):

        # Bootstrap the core machinery without MQTT.
        core_bootstrap(configfile=configfile)

        # Proof that decoding a valid JSON payload decodes it appropriately.
        outcome = decode_payload(section='test/alldata', topic='bar', payload='{"baz": "qux"}')
        assert outcome['topic'] == 'bar'
        assert outcome['baz'] == 'qux'
        assert outcome['alldata-key'] == 'alldata-value'

def test_decode_payload_foo(caplog):

    with caplog.at_level(logging.DEBUG):

        # Bootstrap the core machinery without MQTT.
        core_bootstrap(configfile=configfile)

        # Proof that decoding an unconfigured thing yields nothing sensible.
        outcome = decode_payload(section='foo', topic='bar', payload='baz')
        assert outcome['topic'] == 'bar'
        assert outcome['payload'] == 'baz'
        assert 'Cannot decode JSON object, payload=baz' in caplog.text, caplog.text

def test_decode_payload_json(caplog):

    with caplog.at_level(logging.DEBUG):

        # Bootstrap the core machinery without MQTT.
        core_bootstrap(configfile=configfile)

        # Proof that decoding a valid JSON payload decodes it appropriately.
        outcome = decode_payload(section='foo', topic='bar', payload='{"baz": "qux"}')
        assert outcome['topic'] == 'bar'
        assert outcome['payload'] == '{"baz": "qux"}'
        assert outcome['baz'] == 'qux'

def test_decode_payload_datamap(caplog):

    with caplog.at_level(logging.DEBUG):

        # Bootstrap the core machinery without MQTT.
        core_bootstrap(configfile=configfile)

        # Proof that decoding a valid JSON payload decodes it appropriately.
        outcome = decode_payload(section='test/datamap', topic='bar', payload='{"baz": "qux"}')
        assert outcome['topic'] == 'bar'
        assert outcome['baz'] == 'qux'
        assert outcome['datamap-key'] == 'datamap-value'