TEST_F(CApiWhileLoopTest, UnsetBodyOutput) {
  Init(1);
  CreateCondGraph();
  ExpectError(TF_INVALID_ARGUMENT,
              "TF_WhileParams `body_outputs[0]` field isn't set");
}

// TODO(skyewm): enable this when it works (currently doesn't error)
// TEST_F(CApiWhileLoopTest, WrongBodyOutputType) {
//   Init(1);
//   CreateCondGraph();
//   TF_Operation* double_scalar =