def METHOD_NAME(*, app):
    schema = faust.Schema(
        key_type="bytes",
        value_type="bytes",
        key_serializer="msgpack",
        value_serializer="msgpack",
    )
    channel = app.channel(schema=schema, key_type="str", value_type="str")
    assert channel.key_type == "str"
    assert channel.value_type == "str"
    assert channel.schema.key_type == "str"
    assert channel.schema.value_type == "str"
    assert channel.schema.key_serializer == "msgpack"
    assert channel.schema.value_serializer == "msgpack"