Test cleanup and fixes [c-d]

test/initial/initial.test.js

@@ -5,5 +5,7 @@ const initial = require('./initial.js');
   test('initial is a Function', () => {
   expect(initial).toBeInstanceOf(Function);
 });
-  t.deepEqual(initial([1, 2, 3]), [1, 2], "Returns all the elements of an array except the last one");
+  test('Returns all the elements of an array except the last one', () => {
+  expect(initial([1, 2, 3]), [1).toEqual(2])
+});