Revert "update tests, multiple exercises"

This reverts commit 2eb02ea212.

helloWorld/helloWorld.js

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

helloWorld/helloWorld.spec.js

@@ -1,7 +1,14 @@
+const expect = require('expect');
 const helloWorld = require('./helloWorld');
 
-describe('Hello World', function() {
-  it('says hello world', function() {
-    expect(helloWorld()).toEqual('Hello, World!');
-  });
+// describe('Hello World', function() {
+//   it('says hello world', function() {
+//     expect(helloWorld()).toEqual('Hello, World!');
+//   });
+// });
+
+describe('helloWorld', function() {
+  test('says "Hello, World!"', function() {
+    expect(helloWorld()).toBe("Hello, World!");
+  })
 });