public RingbufferStoreConfig setFactoryClassName(@Nonnull String factoryClassName) {
        this.factoryClassName = checkHasText(factoryClassName, "Ringbuffer store factory class name must contain text");
        this.factoryImplementation = null;
        return this;
    }
@Test
    public void setFactoryClassName() {
        config.setFactoryClassName("myFactoryClassName");

        assertEquals("myFactoryClassName", config.getFactoryClassName());
    }