Lesson 39 - Django Test Design

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Today

• Django Test Design Patterns

Catalog of Design Patterns

• Design Patterns
• Use this catalog of patterns as you work on projects
• Django Tests

Django Tests Design Pattern

• Create tests without thinking
• Build a test suite in 5 minutes
• Generate full test coverage

Steps to Design Pattern

• Define data model
• Define Data Test class
• Define View Test class
• Use template to create automatic code

Django Test Database

• Before every test case a blank database is created
• All database operations are performed on this test database
• Test do not share a database

Setup

• Initialization steps can be added to the setUp function which is run before every test case.
• Objects needed by multiple tests are added to setUp.

python def setUp(self): self.user, self.user_args = create_test_user() self.author = Author.objects.create(user=self.user, name='Mark') self.course = Course.objects.create(title='BACS 350', author=self.author)

Fixtures

• JSON test fixture can set the blank database to any known state
• Test can be run in that database context

Standard test design

• Use a standard template for generating new tests
• Customize class name, object name, field names
• Comment out all new test code
• Debug one test case at a time

Data Test (CRUD)

• Test for each operation (CREATE, READ, UPDATE, DELETE)
• Use consistent naming

```python class LessonDataTest(TestCase):

def setUp(self):
    pass

def test_add_lesson(self):
    pass

def test_lesson_list(self):
    pass

def test_lesson_edit(self):
    pass

def test_lesson_delete(self):
    pass

```

Views Test

• Test all five views: list, detail, add, edit, delete
• Use consistent naming

```python class LessonViewsTest(TestCase):

def login(self):
    pass

def setUp(self):
    pass

def test_lesson_list_view(self):
    pass

def test_lesson_detail_view(self):
    pass

def test_lesson_add_view(self):
    pass

def test_lesson_edit_view(self):
    pass

def test_lesson_delete_view(self):
    pass

```

Basic tests

• Count objects
• Check object fields
• Test for login check
• Check status code
• Check missing pages
• Check page content
• Check the URL
• Check for redirect
• Ensure bad content not present

Assertions

• Django Test Assertions
• Most useful assertions
  • assertTemplateUsed, assertTemplateNotUsed
  • assertContains, assertNotContains
  • assertEqual, assertNotEqual
  • assertTrue, assertFalse

BUILD

Practice

• Clone my repo and study the code in 'week14/CourseBuilder'
• Read the Design Patterns
• Build the code and experiment with it

Course Builder

• Explore the Course Builder App
• Data
• Views
• Templates
• Tests