Function string_format

test/JSONSerializer.cpp:19–24

template <typename... Args>
std::string string_format(const std::string& format, Args... args) {
	size_t size = snprintf(nullptr, 0, format.c_str(), args...) + 1;  // Extra space for '\0'
	std::unique_ptr<char[]> buf(new char[size]);
	snprintf(buf.get(), size, format.c_str(), args...);
	return std::string(buf.get(), buf.get() + size - 1);  // We don't want the '\0' inside
}

TEST_CASE("JsonSerializer", "[json]") {
	GIVEN("A default constructed Context with a LangModule and GraphFunction named hello") {