@Test
  public void testReadCorruptedFile() {
    diskProps.setDiskDirs(dirs);
    region = DiskRegionHelperFactory.getSyncPersistOnlyRegion(cache, diskProps, Scope.LOCAL);

    byte[] value = new byte[1024];

    region.put("1", value);
    region.put("2", value);
    region.put("3", value);
    File oplogFile = null;
    try {
      oplogFile = ((LocalRegion) region).getDiskRegion().testHook_getChild().getOplogFileForTest();
    } catch (Exception e) {
      logWriter.error(
          "Exception in synching data present in the buffers of RandomAccessFile of Oplog, to the disk",
          e);
      fail("Test failed because synching of data present in buffer of RandomAccesFile ");
    }
    region.close();
    try {
      FileInputStream fis = new FileInputStream(oplogFile);
      DataInputStream dis = new DataInputStream(new BufferedInputStream(fis, 1024 * 1024));
      byte[] values = new byte[1000 * 3];
      dis.read(values);
      dis.close();
      fis.close();
      FileOutputStream fos = new FileOutputStream(oplogFile);
      fos.write(values);
      fos.close();

    } catch (FileNotFoundException e) {
      fail(" file expected to be there but not found");
    } catch (IOException e) {
      fail(" exception due to" + e);
    }

    region = DiskRegionHelperFactory.getSyncPersistOnlyRegion(cache, diskProps, Scope.LOCAL);

    Assert.assertTrue(region.size() == 2, "Expected size to be 2 but it is " + region.size());
    // region.close();
  }
to validate the get operation performed on a byte array of length zero
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegRecoveryJUnitTest.java