(test_name => {
                        let element = document.createElement('p');
                        element.className = "test-name";
                        element.innerText = test_name;
                        el_test_tree.appendChild(element);
                    });
                };

                let load_source = (path) => {
                    if (!files[path]) { return; }

                    for (let i = 0; i < el_file_tree.childNodes.length; i++) {
                        let el = el_fi