The CppUTest unit test and mocking framework has the concept of "comparators". Comparators are used to compare two different C/C++ objects.
This repository contains a CppUTest comparator that compares two different nanopb C structs by serializing them and comparing the binary output. This can be used to help unit test C/C++ code that serializes or deserializes protobufs using nanopb.
See the CppUTest mocking framework docs for more details.
// my_fields are the pb_msgdesc_t array found in nanopb's auto-generated header file static NanopbStructComparator my_comparator = NanopbStructComparator(my_fields); TEST_GROUP(MY_TEST_GROUP) { void setup(void) { mock().installComparator("my_protobuf_type", my_comparator); } void teardown(void) { mock().clear(); mock().removeAllComparatorsAndCopiers(); } }; TEST(MY_TEST_GROUP, my_test) { const my_generated_nanopb_struct expected = { // some data } mock(). .expectOneCall("some_function") .withParameterOfType("my_protobuf_type", "some_argument", &expected); }