I have some function to test:
std::string getJsonResult(const SomeDataToProcessData& data);
The goal is to cover it with unit tests using googletest framework. I can't compare output just as strings, because there can be different formatting for the same JSON. E.g.:
{"results":[], "status": 0}
vs.
{
"results":[],
"status": 0
}
The solution for my this issue is available as additional library for JUnit, but my project is in C++.
How to do JSON formatted string assertion using gtest? Are there known implementations?
assuming you have some json_parsing/formatting library available, it's simply a matter of writing your own predicate:
#include <gtest/gtest.h>
#include <string>
// simulated JSON api
struct json_object {};
extern json_object parse(std::string json);
extern std::string format_lean(json_object const& jo);
testing::AssertionResult same_json(std::string const& l, std::string const& r)
{
auto sl = format_lean(parse(l));
auto sr = format_lean(parse(r));
if (sl == sr)
{
return testing::AssertionSuccess();
}
else
{
return testing::AssertionFailure() << "expected:\n" << sl << "\n but got:\n" << sr;
}
}
std::string make_some_json();
TEST(xxx, yyy)
{
auto j_expected = std::string(R"__({ foo: [] })__");
auto j_actual = make_some_json();
ASSERT_TRUE(same_json(j_expected, j_actual));
}