diff --git a/test/collatz/collatz.test.js b/test/collatz/collatz.test.js
index 1922e40ed..73ce78109 100644
--- a/test/collatz/collatz.test.js
+++ b/test/collatz/collatz.test.js
@@ -6,7 +6,18 @@ test('Testing collatz', (t) => {
   //Please go to https://github.com/substack/tape
   t.true(typeof collatz === 'function', 'collatz is a Function');
   //t.deepEqual(collatz(args..), 'Expected');
-  //t.equal(collatz(args..), 'Expected');
+  t.equal(collatz(8), 4, 'When n is even, divide by 2');
+  t.equal(collatz(9), 28, 'When n is odd, times by 3 and add 1');
+
+  let n = 9;
+  while(true){
+    if (n == 1){
+      t.pass('Eventually reaches 1');
+      break;
+    }
+    n = collatz(n);
+  }
+  
   //t.false(collatz(args..), 'Expected');
   //t.throws(collatz(args..), 'Expected');
   t.end();