Add a simple test for grad_op_creator

paddle/framework/CMakeLists.txt

@@ -22,6 +22,7 @@ cc_test(operator_test SRCS operator_test.cc DEPS operator op_registry)
 cc_library(grad_op_creator SRCS grad_op_creator.cc)
 cc_library(op_registry SRCS op_registry.cc DEPS op_proto op_desc grad_op_creator)
 cc_test(op_registry_test SRCS op_registry_test.cc DEPS op_registry operator)
+cc_test(grad_op_creator_test SRCS grad_op_creator_test.cc DEPS grad_op_creator op_registry operator add_op)
 
 py_proto_compile(framework_py_proto SRCS attr_type.proto op_proto.proto op_desc.proto)
 # Generate an empty __init__.py to make framework_py_proto as a valid python module.

paddle/framework/grad_op_creator_test.cc

+#include "paddle/framework/grad_op_creator.h"
+#include <gtest/gtest.h>
+#include "paddle/framework/op_registry.h"
+#include "paddle/framework/operator.h"
+
+USE_OP(add_two);
+
+namespace paddle {
+namespace framework {
+
+TEST(GradOpCreator, AddTwo) {
+  OperatorPtr add_op(OpRegistry::CreateOp("add_two", {"x", "y"}, {"out"}, {}));
+  OperatorPtr grad_add_op = OpRegistry::CreateGradOp(add_op);
+  EXPECT_EQ(static_cast<int>(grad_add_op->inputs_.size()), 4);
+  EXPECT_EQ(static_cast<int>(grad_add_op->outputs_.size()), 2);
+  EXPECT_EQ(grad_add_op->Input("X"), "x");
+  EXPECT_EQ(grad_add_op->Input("Y"), "y");
+  EXPECT_EQ(grad_add_op->Input("Out"), "out");
+  EXPECT_EQ(grad_add_op->Input("Out@GRAD"), "out@GRAD");
+  EXPECT_EQ(grad_add_op->Output("X@GRAD"), "x@GRAD");
+  EXPECT_EQ(grad_add_op->Output("Y@GRAD"), "y@GRAD");
+}
+
+}  // namespace framework
+}  // namespace paddle
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