assertThat(ArbitraryInstances.get(SomeInterface.class)).isNull();
  }

  public void testGet_runnable() {
    ArbitraryInstances.get(Runnable.class).run();
  }

  public void testGet_class() {
    assertSame(SomeAbstractClass.INSTANCE, ArbitraryInstances.get(SomeAbstractClass.class));
    assertSame(
        WithPrivateConstructor.INSTANCE, ArbitraryInstances.get(WithPrivateConstructor.class));

    assertThat(ArbitraryInstances.get(SomeInterface.class)).isNull();
  }

  public void testGet_runnable() {
    ArbitraryInstances.get(Runnable.class).run();
  }

  public void testGet_class() {
    assertSame(SomeAbstractClass.INSTANCE, ArbitraryInstances.get(SomeAbstractClass.class));
    assertSame(
        WithPrivateConstructor.INSTANCE, ArbitraryInstances.get(WithPrivateConstructor.class));

    assertEquals(StringList.class.getGenericInterfaces()[0], token.getType());
  }

  @SuppressWarnings("rawtypes") // Trying to test TypeToken.of(List.class)
  public void testGetClass() {
    TypeToken<List> token = TypeToken.of(List.class);
    assertEquals(new TypeToken<List>() {}, token);
  }

  public void testGetType() {