d);
                } else if (!sysFile.isFile()) {
                    String msg = "refers to a non-existing file " + sysFile.getAbsolutePath();
                    systemPath = systemPath.replace('/', File.separatorChar).replace('\\', File.separatorChar);
                    String jdkHome = request.getSystemProperties().get("java.home") + File.separator + "..";
                    if (systemPath.startsWith(jdkHome)) {

    assertThat(i.next()).isEqualTo(1);
    assertThat(i.hasNext()).isFalse();
  }

  public void testSingletonNullIteratorBasic() {
    Iterator<@Nullable Integer> i = singletonIterator(null);
    assertThat(i.hasNext()).isTrue();
    assertThat(i.next()).isEqualTo(null);
    assertThat(i.hasNext()).isFalse();
  }

  @GwtIncompatible // slow (~4s)