StoreTest.testClearCacheWhenExceptionOccurs() is currently setting up the cache directory to be target/cacheTest, but asserts that target/tmp exists and is empty. The tmp dir happens to be created by CacheResponseWrapper.thresholdReached() calling Path.getTempDirectory()

Suggestion: extract a subclass that gets reused accross the cache test which configures those directories, assert they don't exit in @Before and removes them in @After