public String getClassName() {
        return className;
    }
@Test
    public void getAsReadOnly() {
        MapStoreConfigReadOnly readOnlyCfg = new MapStoreConfigReadOnly(cfgNonNullClassName);
        assertEquals("some.class", readOnlyCfg.getClassName());
        assertEquals(cfgNonNullClassName, readOnlyCfg);
        // also test returning cached read only instance
        assertEquals(readOnlyCfg, new MapStoreConfigReadOnly(cfgNonNullClassName));
    }