The doctest test framework works well with Approval Tests.
Doctest is similar to Catch, but claims to give faster compilation times.
Approval Tests for doctest requires that a file called doctest.h is found.
Approval Tests needs doctest version 2.3.4 or above.
Create a file main.cpp and add just the following two lines:
// main.cpp:
#define APPROVALS_DOCTEST // This tells Approval Tests to provide a main() - only do this in one cpp file
#include "ApprovalTests.hpp"