Test cleanup and fixes [c-d]

test/collatz/collatz.test.js

@@ -1,24 +1,22 @@
 const expect = require('expect');
 const collatz = require('./collatz.js');
 
-
-  test('collatz is a Function', () => {
+test('collatz is a Function', () => {
   expect(collatz).toBeInstanceOf(Function);
 });
-  test('When n is even, divide by 2', () => {
-  expect(collatz(8), 4).toBe()
+test('When n is even, divide by 2', () => {
+  expect(collatz(8)).toBe(4);
 });
-  test('When n is odd, times by 3 and add 1', () => {
-  expect(collatz(9), 28).toBe()
+test('When n is odd, times by 3 and add 1', () => {
+  expect(collatz(9)).toBe(28);
 });
-
+test('Eventually reaches 1', () => {
   let n = 9;
   while(true){
     if (n === 1){
-      
+      expect(n).toBe(1);
       break;
     }
     n = collatz(n);
   }
-  
-
+});