Fix bad test function usage

Author: 40thieves

mandatory/9-group-people.js

@@ -17,7 +17,7 @@ To run the tests for just this one file, type `npm test -- --testPathPattern 2-o
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 */
 
-TestScheduler("volunteersAndTrainees works", () => {
+test("volunteersAndTrainees works", () => {
   let volunteers = ["Daniel", "Irina", "Rares"];
   let trainees = ["Rukmini", "Abdul", "Austine", "Swathi"];