@Test public void testFileIOEngine() throws IOException { int size = 2 * 1024 * 1024; // 2 MB String filePath = "testFileIOEngine"; try { FileIOEngine fileIOEngine = new FileIOEngine(filePath, size); for (int i = 0; i < 50; i++) { int len = (int) Math.floor(Math.random() * 100); long offset = (long) Math.floor(Math.random() * size % (size - len)); byte[] data1 = new byte[len]; for (int j = 0; j < data1.length; ++j) { data1[j] = (byte) (Math.random() * 255); } byte[] data2 = new byte[len]; fileIOEngine.write(ByteBuffer.wrap(data1), offset); fileIOEngine.read(ByteBuffer.wrap(data2), offset); for (int j = 0; j < data1.length; ++j) { assertTrue(data1[j] == data2[j]); } } } finally { File file = new File(filePath); if (file.exists()) { file.delete(); } } }