class GradientsTest : public ::testing::Test {
 protected:
  GradientsTest()
      : scope_expected_(Scope::NewRootScope()),
        scope_test_(Scope::NewRootScope()) {}

  void CompareTestAndExpectedGraphs() {
    GraphDef gdef_test;
    TF_ASSERT_OK(scope_test_.ToGraphDef(&gdef_test));
    GraphDef gdef_exp;
    TF_ASSERT_OK(scope_expected_.ToGraphDef(&gdef_exp));
    TF_EXPECT_GRAPH_EQ(gdef_exp, gdef_test);
  }