assertTrue(output.contains("event: chunk"));
        assertTrue(output.contains("日本語") || output.contains("\\u")); // Either raw or escaped
    }

    @Test
    public void test_sendSseEvent_emptyMap() {
        final StringWriter stringWriter = new StringWriter();
        final PrintWriter writer = new PrintWriter(stringWriter);

        chatApiManager.sendSseEvent(writer, "test", Map.of());