Test files linted

test/collatz/collatz.test.js

@@ -12,7 +12,7 @@ test('When n is odd, times by 3 and add 1', () => {
 });
 test('Eventually reaches 1', () => {
   let n = 9;
-  while(true) {
+  while (true) {
     if (n === 1) {
       expect(n).toBe(1);
       break;