this test is to ensure the process of running the test is working perfecet

01_helloWorld/helloWorld.js

@@ -1,5 +1,5 @@
 const helloWorld = function() {
-  return ''
+  return 'Hello, World!'
 };
 
 module.exports = helloWorld;

01_helloWorld/helloWorld.spec.js

@@ -1,7 +1,7 @@
-const helloWorld = require('./helloWorld');
+const greeting = require('./helloWorld');
 
 describe('Hello World', function() {
   test('says "Hello, World!"', function() {
-    expect(helloWorld()).toEqual('Hello, World!');
+    expect(greeting()).toEqual('Hello, World!');
   });
 });