} catch (Exception e) {
            fail("sendToGoogleChat() should not throw an exception with null URLs: " + e.getMessage());
        }
    }

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