Updated the test system

test/pull.test.js

@@ -0,0 +1,11 @@
+const expect = require('expect');
+const {pull} = require('./_30s.js');
+
+test('pull is a Function', () => {
+  expect(pull).toBeInstanceOf(Function);
+});
+let myArray = ['a', 'b', 'c', 'a', 'b', 'c'];
+pull(myArray, 'a', 'c');
+test('Pulls the specified values', () => {
+  expect(myArray).toEqual(['b', 'b']);
+});