message: Properly assert the SingleOpModel(test utility) invocation's success
diff: @@ -89,7 +89,7 @@ TEST(RaggedRangeOpTest, IntValues) {
  RaggedRangeOpModel<int32> model({0, 5, 8, 5}, // Starts.
  {8, 7, 8, 1}, // Limits.
  {2, 1, 1, -1}); // Deltas.
  - model.Invoke();
  + ASSERT_EQ(model.InvokeUnchecked(), kTfLiteOk);
  EXPECT_THAT(model.GetSplits(),
  testing::UnorderedElementsAreArray({0, 4, 6, 6, 10}));
  @@ -101,7 +101,7 @@ TEST(RaggedRangeOpTest, FloatValues) {
  RaggedRangeOpModel<float> model({0, 5, 8, 5}, // Starts.
  {8, 7, 8, 1}, // Limits.
  {2, 1, 1, -1}); // Deltas.
  - model.Invoke();
  + ASSERT_EQ(model.InvokeUnchecked(), kTfLiteOk);
  EXPECT_THAT(model.GetSplits(),
  testing::UnorderedElementsAreArray({0, 4, 6, 6, 10}));
  @@ -113,7 +113,7 @@ TEST(RaggedRangeOpTest, BroadcastDelta) {
  RaggedRangeOpModel<int32> model({0, 5, 8}, // Starts.
  {8, 7, 8}, // Limits.
  {1}); // Deltas.
  - model.Invoke();
  + ASSERT_EQ(model.InvokeUnchecked(), kTfLiteOk);
  EXPECT_THAT(model.GetSplits(),
  testing::UnorderedElementsAreArray({0, 8, 10, 10}));
  @@ -125,7 +125,7 @@ TEST(RaggedRangeOpTest, BroadcastStartDeltas) {
  RaggedRangeOpModel<int32> model({0}, // Starts.
  {10}, // Limits.
  {2, 1}); // Deltas.
  - model.Invoke();
  + ASSERT_EQ(model.InvokeUnchecked(), kTfLiteOk);
  EXPECT_THAT(model.GetSplits(),
  testing::UnorderedElementsAreArray({0, 5, 15}));
  @@ -145,7 +145,7 @@ TEST(RaggedRangeOpTest, ZeroRange) {
  RaggedRangeOpModel<int32> model({0, 7}, // Starts.
  {8, 5}, // Limits.
  {1, 1}); // Deltas.
  - model.Invoke();
  + ASSERT_EQ(model.InvokeUnchecked(), kTfLiteOk);
  EXPECT_THAT(model.GetSplits(), testing::UnorderedElementsAreArray({0, 8, 8}));
  EXPECT_THAT(model.GetValues(),
  testing::UnorderedElementsAreArray({0, 1, 2, 3, 4, 5, 6, 7}));
  