update setup example tutorial

Author: ShMcK

setup/tutorial/01/01.js

@@ -6,6 +6,10 @@ describe('01 addOne', () => {
 
 	const addOne = page.__get__('addOne');
 
+	it('doesn\t exist', () => {
+		expect(addOne).to.not.be.undefined;
+	});
+
 	it('should take a parameter', () => {
 		expect(addOne).to.have.length(1);
 	});

setup/tutorial/01/02.js

@@ -2,6 +2,10 @@ describe('02 subtractOne', () => {
 
   const subtractOne = page.__get__('subtractOne');
 
+  it('doesn\t exist', () => {
+		expect(subtractOne).to.not.be.undefined;
+	});
+
   it('should take a parameter', () => {
     expect(subtractOne).to.have.length(1);
   });

setup/tutorial/02/01.js

@@ -1,11 +1,15 @@
-const expect = require('chai').expect;
+const { expect } = require('chai');
 
 const page = require('BASE/page-02');
 
 describe('01 divideOne', () => {
 
   const divideOne = page.__get__('divideOne');
 
+  it('doesn\t exist', () => {
+		expect(divideOne).to.not.be.undefined;
+	});
+
   it('should take a parameter', () => {
     expect(divideOne).to.have.length(1);
   });

setup/tutorial/02/02.js

@@ -2,6 +2,10 @@ describe('02 multiplyOne', () => {
 
   const multiplyOne = page.__get__('multiplyOne');
 
+  it('doesn\t exist', () => {
+		expect(multiplyOne).to.not.be.undefined;
+	});
+
   it('should take a parameter', () => {
     expect(multiplyOne).to.have.length(1);
   });

setup/tutorial/02/index.md

@@ -15,7 +15,7 @@ function divideOne(x) {
 ```
 ))
 
-+ write a function `mutiplyone` that multiplies a number by 1
++ write a function `mutiplyOne` that multiplies a number by 1
 @test('02/02')
 @action(insert(
 ```