@Test
@PrepareForTest(TerrapinUtil.class)
public void testGetS3FileList() throws Exception {

  AmazonS3Client s3Client = mock(AmazonS3Client.class);
  ObjectListing objectListing = mock(ObjectListing.class);
  S3ObjectSummary summary1 = new S3ObjectSummary();
  S3ObjectSummary summary2 = new S3ObjectSummary();
  S3ObjectSummary summary3 = new S3ObjectSummary();
  summary1.setKey("/abc/123");
  summary2.setKey("/abc/456");
  summary3.setKey("/def/123");
  summary1.setSize(32432);
  summary2.setSize(213423);
  summary3.setSize(2334);
  List<S3ObjectSummary> summaries = ImmutableList.of(summary1, summary2, summary3);
  whenNew(AmazonS3Client.class).withAnyArguments().thenReturn(s3Client);
  when(s3Client.listObjects(any(ListObjectsRequest.class))).thenReturn(objectListing);
  when(objectListing.getObjectSummaries()).thenReturn(summaries);
  List<Pair<Path, Long>> results = TerrapinUtil.getS3FileList(new AnonymousAWSCredentials(),
      "bucket", "/abc");
  assertEquals(2, results.size());
  assertTrue(results.get(0).getLeft().toString().endsWith(summary1.getKey()));
  assertEquals(new Long(summary1.getSize()), results.get(0).getRight());
  assertTrue(results.get(1).getLeft().toString().endsWith(summary2.getKey()));
  assertEquals(new Long(summary2.getSize()), results.get(1).getRight());
}