text: #include "catch2/catch.hpp"
  
  #include "testee.hpp"
  
  TEST_CASE("single_header, single_test_file_multiple_sources: add")
  {
      REQUIRE(add(0, 0) == 0);
      REQUIRE(add(1, 0) == 1);
      REQUIRE(add(0, 1) == 1);
      REQUIRE(add(1, 1) == 2);
      REQUIRE(add(2, 3) == 5);
  }
  