Test cleanup and fixes [c-d]

test/longestItem/longestItem.test.js

@@ -5,5 +5,7 @@ const longestItem = require('./longestItem.js');
   test('longestItem is a Function', () => {
   expect(longestItem).toBeInstanceOf(Function);
 });
-  t.deepEqual(longestItem('this', 'is', 'a', 'testcase'), 'testcase', "Returns the longest object");
+  test('Returns the longest object', () => {
+  expect(longestItem('this', 'is', 'a', 'testcase')).toEqual('testcase')
+});