@Test
    public void test_append_booleanValue() {
        StringBuilder buf = new StringBuilder();
        Supplier<Object> supplier = () -> Boolean.TRUE;

        monitorTarget.append(buf, "boolKey", supplier);
        assertEquals("\"boolKey\":\"true\"", buf.toString());
    }

    // Test append method with Date value (other object type)
    @Test
    public void test_append_dateValue() {

        dataStoreParams.put("longKey", 456L);
        assertEquals("456", dataStoreParams.getAsString("longKey"));

        dataStoreParams.put("boolKey", true);
        assertEquals("true", dataStoreParams.getAsString("boolKey"));
    }

    // Test getAsString with null value
    @Test
    public void test_getAsStringWithNullValue() {
        dataStoreParams.put("nullKey", null);