assertTrue(result.startsWith("{\"text\":\""));
        assertTrue(result.endsWith("\"}"));

        assertTrue(result.contains("```"));
    }

    @Test
    public void test_toSlackMessage_withEmptyContent() {
        MockSMailPostingDiscloser discloser = new MockSMailPostingDiscloser();
        discloser.setSubject("");
        discloser.setPlainText("");