def METHOD_NAME(self, uqcsbot: MockUQCSBot):
    uqcsbot.post_message(TEST_CHANNEL_ID, "!link")
    messages = uqcsbot.test_messages.get(TEST_CHANNEL_ID, [])
    assert messages[-1]["attachments"][0]["color"] == "#ffff00"
    assert get_last_slackblocks_message_text(messages) \
           == """usage: !link [-c | -g] [-f] key [value [value ...]]