Updated the test system

test/pullAtIndex.test.js

@@ -0,0 +1,14 @@
+const expect = require('expect');
+const {pullAtIndex} = require('./_30s.js');
+
+test('pullAtIndex is a Function', () => {
+  expect(pullAtIndex).toBeInstanceOf(Function);
+});
+let myArray = ['a', 'b', 'c', 'd'];
+let pulled = pullAtIndex(myArray, [1, 3]);
+test('Pulls the given values', () => {
+  expect(myArray).toEqual(['a', 'c']);
+});
+test('Pulls the given values', () => {
+  expect(pulled).toEqual(['b', 'd']);
+});