Updated the test system

test/initializeArrayWithValues.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const {initializeArrayWithValues} = require('./_30s.js');
+
+test('initializeArrayWithValues is a Function', () => {
+  expect(initializeArrayWithValues).toBeInstanceOf(Function);
+});
+test('Initializes and fills an array with the specified values', () => {
+  expect(initializeArrayWithValues(5, 2)).toEqual([2, 2, 2, 2, 2]);
+});