public String getId() {
    return id;
  }
@Test
  public void testStaticTupleTag() {
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#0", staticTag.getId());
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#3", staticBlockTag.getId());
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#1", staticMethodTag.getId());
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#2", instanceMethodTag.getId());
    assertEquals(
        "org.apache.beam.sdk.values.TupleTagTest$AnotherClass#0", AnotherClass.anotherTag.getId());
  }