assertNull(docMap.remove("nonexistent"));

        assertEquals(1, docMap.size());
        assertTrue(docMap.containsKey("key2"));
    }

    @Test
    public void test_putAll() {
        Map<String, Object> parentMap = new HashMap<>();
        DocMap docMap = new DocMap(parentMap);

        Map<String, Object> sourceMap = new HashMap<>();
        sourceMap.put("key1", "value1");

        dataStoreParams.put("key2", null);
        assertTrue(dataStoreParams.containsKey("key2"));
    }

    // Test putAll
    @Test
    public void test_putAll() {
        Map<String, String> map = new HashMap<>();
        map.put("key1", "value1");
        map.put("key2", "value2");
        map.put("key3", "value3");

        dataStoreParams.putAll(map);