Merge branch 'origin/master' into 'jest'

helloWorld/helloWorld.js

@@ -2,4 +2,4 @@ const helloWorld = function() {
   return ''
 }
 
-module.exports = helloWorld;
+module.exports = helloWorld

helloWorld/helloWorld.spec.js

@@ -1,5 +1,7 @@
 const helloWorld = require('./helloWorld');
 
-test('says "Hello, World!"', function() {
-  expect(helloWorld()).toBe("Hello, World!");
+describe('Hello World', function() {
+  it('says hello world', function() {
+    expect(helloWorld()).toEqual('Hello, World!');
+  });
 });