void test_totalDegree()
        {
            size_t observed_value = ggraph.totalDegree(v8);
            if (observed_value == true_value_totalDegree_v8)
                printColoredText("✔ test_totalDegree() PASSED!", ANSI_COLOR_GREEN);
            else
                printColoredText(std::format("✘ test_totalDegree() FAILED! \n\t Expected: {}, Got: {}", observed_value, true_value_totalDegree_v8), ANSI_COLOR_RED);
        }

void test_getEdge()
        {
            int observed_edge = ggraph.getEdge(v1, v8);
            int true_edge_value = 31;
            if (observed_edge == true_edge_value)
                printColoredText("✔ test_getEdge() PASSED!", ANSI_COLOR_GREEN);
            else
                printColoredText(std::format("✘ test_getEdge() FAILED! \n\t Expected: {}, Got: {}", true_edge_value, observed_edge), ANSI_COLOR_RED);
        }

void init_tests()
        {
            //other functions.
            test_getEdge(); //<- your new function to register here.
        }