@Override
  public List<Artifact> listArtifacts(TestName testName, Pattern regex) {
    return listArtifacts(testName.getMethodName(), regex);
  }
@Test
  public void testListArtifactsInMethodDirNoArtifacts() {
    TestBlobPage allPages = createPages(ImmutableList.of());
    when(client.list(anyString(), any(BlobListOption.class))).thenReturn(allPages);
    Pattern pattern = Pattern.compile(".*blob[13].*");

    List<Artifact> actual = gcsClient.listArtifacts(TEST_METHOD, pattern);

    verify(client).list(anyString(), any(BlobListOption.class));
    assertThat(actual).isEmpty();
  }