ifstream not reading anything - c++

Question

I'm writing code in C++ and I need to read a file, problem is my file structure is a bit complex and I just cannot figure out how to use my ifstream to read it. I think I tried all possible combinations... but it just doesn't work, I guess I'm doing something wrong but I can't figure it out.
Here is a minimal reproduction of my problem.
structure :
.
├── build
├── CMakeLists.txt
└── src
├── file
│   └── test.txt
├── load
│   └── loadfile.hpp
└── main.cpp
CMakeLists.txt :
cmake_minimum_required(VERSION 3.10)
project(BaseProject)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_FLAGS "-O3 -g -std=c++17 -Wall -Wextra -pedantic")
file(GLOB SRC
"src/*.h"
"src/*.hpp"
"src/load/*.h"
"src/load/*.hpp"
"src/load/*.cpp"
)
add_executable(exec ${SRC} src/main.cpp)
main.cpp
#include "load/loadfile.hpp"
int main(){
load();
return 0;
}
test.txt : (not very relevent but meh)
test
loadfile.hpp
#include <fstream>
#include <string>
#include <iostream>
void loadFile(const std::string& file){
std::ifstream i(file, std::ifstream::in);
std::string str;
i >> str;
std::cerr << str;
i.close();
}
void load(){
loadFile("../file/test.txt");
}
output is empty and program finishes normally.

Answer 1

This might help, when you call install your files will be copied to destination specified.
cmake_minimum_required(VERSION 3.10)
project(BaseProject)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_FLAGS "-O3 -g -std=c++17 -Wall -Wextra -pedantic")
set(OUTPUT_DIR "Yours to fill, working dir")
file(GLOB RESOURCES "./file/test.txt")
file(GLOB SRC
"src/*.h"
"src/*.hpp"
"src/load/*.h"
"src/load/*.hpp"
"src/load/*.cpp"
)
add_executable(exec ${SRC} src/main.cpp)
install (FILES ${RESOURCES} DESTINATION ${OUTPUT_DIR})

Answer 2

Answer from Some programmer dude in the comments:
Now might be a good time to learn about the concept of current working
directory. When you run a program, its process will have a current
working directory. If you run from a console or terminal then it's
usually the terminals current directory. Relative paths (paths not
beginning with a /) are always relative to the current working
directory. You need to make sure that the relative path in the program
is valid for the programs current working directory when running.