assertEquals(value, generator.generateFresh(type));
  }

  private enum EmptyEnum {}

  private enum OneConstantEnum {
    CONSTANT1
  }

  private enum TwoConstantEnum {
    CONSTANT1,
    CONSTANT2
  }

  private static void assertCanGenerateOnly(TypeToken<?> type, Object expected) {
    FreshValueGenerator generator = new FreshValueGenerator();

    assertEquals(value, generator.generateFresh(type));
  }

  private enum EmptyEnum {}

  private enum OneConstantEnum {
    CONSTANT1
  }

  private enum TwoConstantEnum {
    CONSTANT1,
    CONSTANT2
  }

  private static void assertCanGenerateOnly(TypeToken<?> type, Object expected) {
    FreshValueGenerator generator = new FreshValueGenerator();

    feed2_ = Placeholder(graph_, s_, "feed2");
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);

    constant_ = ScalarConst(10, graph_, s_);
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);

    desc_ = TF_NewOperation(graph_, "AddN", "add");
    TF_Output inputs[] = {{feed1_, 0}, {constant_, 0}};
    TF_AddInputList(desc_, inputs, TF_ARRAYSIZE(inputs));
  }

  ~CApiColocationTest() override {