String[] newValues = { "new_value1", "new_value2" };
        data.putValues("key", newValues);

        String[] retrievedValues = data.getValues("key");
        assertEquals(2, retrievedValues.length);
        assertEquals("new_value1", retrievedValues[0]);
        assertEquals("new_value2", retrievedValues[1]);
    }

    public void test_getValuesNonExistentKey() {
        // Test getValues with non-existent key