public void test_getAsStringNonExistentKey() {
        assertNull(dataStoreParams.getAsString("nonexistent"));
    }

    // Test getAsString with default value
    public void test_getAsStringWithDefaultValue() {
        dataStoreParams.put("existingKey", "existingValue");
        assertEquals("existingValue", dataStoreParams.getAsString("existingKey", "defaultValue"));