code: public void testCacheEvictionSimple() throws Exception {
    long maxSize=100000;
    long blockSize=calculateBlockSizeDefault(maxSize,10);
    LruBlockCache cache=new LruBlockCache(maxSize,blockSize,false);
    Block[] blocks=generateFixedBlocks(10,blockSize,"block");
    long expectedCacheSize=cache.heapSize();
    for (  Block block : blocks) {
      cache.cacheBlock(block.blockName,block.buf);
      expectedCacheSize+=block.heapSize();
    }
    assertEquals(1,cache.getEvictionCount());
    assertTrue(expectedCacheSize > (maxSize * LruBlockCache.DEFAULT_ACCEPTABLE_FACTOR));
    assertTrue(cache.heapSize() < maxSize);
    assertTrue(cache.heapSize() < (maxSize * LruBlockCache.DEFAULT_ACCEPTABLE_FACTOR));
    assertTrue(cache.getBlock(blocks[0].blockName) == null);
    assertTrue(cache.getBlock(blocks[1].blockName) == null);
    for (int i=2; i < blocks.length; i++) {
      assertEquals(cache.getBlock(blocks[i].blockName),blocks[i].buf);
    }
  }
  