given:
        cacheOpened()

        when:
        cache.put("key", "value")

        then:
        1 * fileAccess.writeFile(!null) >> { Runnable action -> action.run() }
        1 * backingCache.put("key", "value")
        0 * _._
    }

    def "holds write lock while removing entry from cache"() {
        given:
        cacheOpened()

        when:
        cache.remove("key")