Testing lesson notes

testing.md

Testing

Objectives

• Explain what Unit Tests, Integration Tests and End-to-End tests are
• Write unit tests for a given problem
• Describe the difference between TDD and BDD
• Identify the purpose & tools for Continuous Integration, Code Coverage and Cross-Browser testing

Terms

• Unit Test
• Integration Test
• End-to-End Test
• Cross-Browser & Device Testing
• Code Coverage
• Continuous Integration (CI)
• Test Driven Development (TDD)
• Behaviorst Driven Development (BDD)

Resources

• https://www.joecolantonio.com/2014/07/29/unit-tdd-and-bdd-testing-whats-the-difference/
• http://softwaretestingfundamentals.com/integration-testing/

Questions

• What is a Unit Test, in your own words?

  it('should pop items in LIFO order', function() {
    stack.push(1)
    stack.push(2)
    expect(stack.pop()).to.equal(2)
    expect(stack.pop()).to.equal(1)
  })

  Your answer...

• What is a Integration Test, in your own words?

  const request = require('supertest')('http://localhost:3000')
  
  it('should fetch created user', function(done) {
    request.post('/api/people')
      .send({ name: 'Tony' })
      .expect(200)
      .end(function(res, err) {
        if(err) return done(err)
  
        request.get('/api/people')
          .expect(200)
          .expect(function(res, err) {
            expect(res.body.name).to.equal('Tony')
          })
          .end(done)
      })
    })

  Your answer...

• What is a End-to-End Test, in your own words?

  it('adds and removes todo items', function() {
    casper.open('http://localhost:3000/')
    
    casper.then(function() {
      this.fill('my-form', { item: 'New Item' }, true)
      expect('.item-label').to.have.text('New Item')
    })
    
    casper.then(function() {
      this.click('.submit-button')
      expect('.item-label').to.not.be.inDOM
    })
    
  })

  Your answer...

• What parts of your application should you test and what parts should you not test?

  Topics to consider:

  • Constraints
  • Environment Variables
  • HTTP request and status code
  • Page has specific title
  • font size, color etc
  • functions from a third-party library (like underscore)
  • API enpoint permissions
  • API authentication / login
  • Test things you have to check every time you make changes and restart your server?
  • Test elements on your frontend that require manual user acceptance?

• Given the following addNums function, write a very simple unit test to asses if it works correctly:

  function addNums(a,b) {
    
  }
  
  // tests
  console.log('addNums is a function:', typeof addNums === 'function')

  After you've writen a test, try writing the code for addNums. If you get the test to pass, write another test THEN write more passing code.

  Your answer...

• How would we write the test you came up with above using an assertion library like Chai or Jest?

  Your answer...

• With your table, come up with a definition for Test Driven Development (TDD) and Behavior Driven Development (BDD).

  Your answer...

• With your table try to identify the purpose and tools for Continuous Integration, Code Coverage and Cross-Browser testing?

  Your answer...

• The following is a very basic example of tested code with Continuous Integration:

  https://github.com/Shurlow/testing-testing