Catch2 v3 - undefined reference to

Question

I have this project for university which we have to make a small game in C++. I'm trying to use Test Driven Development for the most fundamental parts of the game so I was trying to set up Catch2, I already set up CMake and it works just fine, then I set up Catch2 v3 but it isn't working properly

CMakeLists.txt:

cmake_minimum_required(VERSION 3.10)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

project(game VERSION 0.1)

file(GLOB_RECURSE SRC_FILES src/*.cpp)
add_executable(game main.cpp ${SRC_FILES})
target_include_directories(game PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include())


find_package(Catch2 3 REQUIRED)
# These tests can use the Catch2-provided main
add_executable(tests ../testing/test.cpp)
target_include_directories(tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include())
target_link_libraries(tests PRIVATE Catch2::Catch2WithMain)

The following is my test.cpp file (with only one of the test cases so this post doesn't get huge):

/* Include the unit testing libraries */
#define CATCH_CONFIG_MAIN
#include <catch2/catch_test_macros.hpp>

/* Include the code that we plan to test */
#include "worldmap.h"

/** of course we could check every single possible value, but this isn't 
 * going to be an option in most cases as we might have to check
 * billions of possible values which isn't realistic **/
TEST_CASE( "1: Children (worldmap.h)", "[multi-file:1]" )
{
    const std::string expectedAnswer = "child";
    const int minimum = 5;
    const int maximum = 12;
    
    WHEN( "Is a child, 5 to 12 years")
    {
        for( int test=minimum; test<=maximum; ++test )
        {
            INFO( "Age is " << test );
            REQUIRE( ageDesc(test) == expectedAnswer );
        }
    }

    WHEN( "Is not a child edge cases" )
    {
        // making sure that just outside the min and max of the range is correct
        INFO( "Age is " << minimum-1 );
        REQUIRE( ageDesc(minimum-1) != expectedAnswer );

        INFO( "Age is " << maximum+1 );
        REQUIRE( ageDesc(maximum+1) != expectedAnswer );
    }
}

worldmap.cpp:

#include <string>
#include "worldmap.h"

std::string ageDesc( int age )
{
    if( age < 0 || age > 122) return "lying";
    if( age < 5 ) return "baby";
    if( age >= 5 && age <= 12 ) return "child";
    if( age >= 13 && age <= 19 ) return "teenager";
    if( age >= 65 && age <= 122 ) return "oap";
    
    return "adult";
}

worldmap.h:

#ifndef WORLDMAP_H
#define WORLDMAP_H

std::string ageDesc( int age );

#endif

main.cpp:

#include <iostream>
#include "worldmap.h"

int main() {
    std::cout << "\nHow old are you? ";

    int age;
    std::cin >> age;
    std::cout<<ageDesc(age)<<std::endl;
    return 0;
}

My file structure is as follows:

-- main.cpp

• src -- worldmap.cpp
• include -- worldmap.h
• testing -- test.cpp
• build -- all cmake files

My main.cpp, worldmap.cpp and worldmap.h are correctly "linked" and they work just fine I've tested them before and when using cmake i was able to compile everything correctly and even run the game (by the way the age thing is just the code provided by my university when showing testing files, I couldn't come up with a better test at the moment so I just used theirs, essentially it just asks the user what their age is and returns whether they're a baby, child, teen, adult, OAP, etc...) The problem is that my test file gives me the error:

undefined reference to 'ageDesc[abi:cxx11](int)'

but it is defined in worldmap.h which is being included in the test file. I have googled and looked at the documentation but haven't found anything about this. The only proper answer on google mentioned how the #define CATCH_CONFIG_MAIN should come before #include <catch2.hpp> but that was for v3, so I'm using #include <catch2/catch_test_macros.hpp> and I've tried to both use and remove the CATCH_CONFIG_MAIN definition and it still gives me the same error.