### Question:
CacheUtil { public static void remove( DataSpec dataSpec, Cache cache, @Nullable CacheKeyFactory cacheKeyFactory) { remove(cache, buildCacheKey(dataSpec, cacheKeyFactory)); } private  CacheUtil(); static String generateKey(Uri uri); static Pair<Long, Long> getCached(
      DataSpec dataSpec, Cache cache, @Nullable CacheKeyFactory cacheKeyFactory); static void cache(
      DataSpec dataSpec,
      Cache cache,
      @Nullable CacheKeyFactory cacheKeyFactory,
      DataSource upstream,
      @Nullable ProgressListener progressListener,
      @Nullable AtomicBoolean isCanceled); static void cache(
      DataSpec dataSpec,
      Cache cache,
      @Nullable CacheKeyFactory cacheKeyFactory,
      CacheDataSource dataSource,
      byte[] buffer,
      PriorityTaskManager priorityTaskManager,
      int priority,
      @Nullable ProgressListener progressListener,
      @Nullable AtomicBoolean isCanceled,
      boolean enableEOFException); static void remove(
      DataSpec dataSpec, Cache cache, @Nullable CacheKeyFactory cacheKeyFactory); static void remove(Cache cache, String key); static final int DEFAULT_BUFFER_SIZE_BYTES; static final CacheKeyFactory DEFAULT_CACHE_KEY_FACTORY; }### Answer:
@Test public void testRemove() throws Exception { FakeDataSet fakeDataSet = new FakeDataSet().setRandomData("test_data", 100); FakeDataSource dataSource = new FakeDataSource(fakeDataSet); Uri uri = Uri.parse("test_data"); DataSpec dataSpec = new DataSpec(uri, DataSpec.FLAG_ALLOW_CACHE_FRAGMENTATION); CacheUtil.cache( dataSpec, cache, null, new CacheDataSource( cache, dataSource, new FileDataSource(), new CacheDataSink(cache, 10), 0, null), new byte[CacheUtil.DEFAULT_BUFFER_SIZE_BYTES], null, 0, null, null, true); CacheUtil.remove(dataSpec, cache, null); assertCacheEmpty(cache); }