Lesson 17 - Test Driven Development

LEARN

Software Engineer

• Beyond programming
• Makes you more valuable
• Many will lack engineering skills

Test Driven Development

• Kent Beck - 2003
• Test-Driven Development
• High discipline process to produce outstanding quality

Test-Driven Development

• Select a feature
• Define a failing test
• Write enough code to pass the test
• Select the next feature and repeat

Shrinking World Software Planner

Shrinking World Software Planner

• Shrinking World Software Planner
  • Test
  • Fix
  • Extend
  • Improve

Basic Automatic Test

class MyTest(TestCase):

    def test_one_thing(self):
        result = do_an_action()
        self.assertEqual(result, "Expected Answer")

CRUD Tests

class BookTest(TestCase):

    def test_book_list(self):
        self.assertEqual(len(Book.objects.all()), 0)

    def test_add_book(self):
        Book.objects.create(title='Tale of 2 Cities', author='Chuck Dickens')
        Book.objects.create(title='Iliad', author='Homer')
        self.assertEqual(len(Book.objects.all()), 2)

CRUD Tests

• List
• Detail
• Create
• Update
• Delete

Data CRUD Views Tests

• List
• Detail
• Add
• Edit
• Delete

View Test

• Page exists
• URL Route to view
• Template Used
• Objects in view
• HTML fragments

Test Page Exists

python def test_page_exists(self): response = self.client.get('/book/') self.assertEqual(response.status_code, 200)

Test URL Route to view

python def test_book_list_view(self): url = reverse('book_list') response = self.client.get(url) self.assertEqual(response.status_code, 200)

Template Used

python def test_book_list_view(self): response = self.client.get('/book/') self.assertTemplateUsed(response, 'book_list.html') self.assertTemplateUsed(response, 'book_theme.html')

Objects in view

python def test_objects_in_view(self): response = self.client.get('/book/') self.assertContains(response, '<li>', count=3)

HTML fragments

python def test_contains(self): self.assertContains(response, '<title>Book List</title>')

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BUILD

Demo Code for Book Builder

• Book Builder
• Shrinking World Software Planner

Live Demo

• Review To Do List
• Test Book CRUD
• Test Book Views
• Add fields to Book model
• Create Design Pattern

Project 6 Requirements

• Superhero Database with at least five superheros
• Superhero Data Model
  • name, identity, description, strength, weakness, image
  • Set default keyword argument in new fields added
• Superhero Custom Views
  • List
  • Detail
  • Add
  • Edit
  • Delete
• Views Stylesheet
  • View inheritance
  • CSS