Full Clean Factories

Researching the model instance factories available for Django and how well they create valid objects for our tests.

In this talk I present my research into various Django factories. Full write-up is available at http://jamescooke.info/django-factory-audit.html

Transcript

1. Full
   Clean
   Factories
   James Cooke
   Licensed under the
   Creative Commons Attribution-ShareAlike 3.0 Unported License.
   

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2. Outline
   ●
   Problem
   ●
   Libraries
   ●
   Grading factories
   ●
   Factory features
   ●
   Results
   

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3. Problem
   

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4. Factories
   ●
   Django Fakery
   ●
   Factory Boy
   ●
   Factory Djoy
   ●
   Hypothesis[django]
   ●
   Mixer
   ●
   Model Mommy
   

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5. Grading factories: Test
   ●
   Two models: User and Item
   ●
   Two factories: UserFactory and
   ItemFactory
   ●
   Create 10 instances
   class Item(models.Model):
   name = models.CharField(
   max_length=1, unique=True)
   

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6. Grading factories: Grades
   ●
   RED: Creates invalid instances
   ●
   YELLOW: Raises exception
   ●
   GREEN: Creates valid instances
   

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7. Factories
   Factory ItemFactory UserFactory
   Django Fakery RED YELLOW
   Factory Boy RED RED
   Factory Djoy YELLOW GREEN
   Hypothesis[django] RED RED
   Mixer GREEN GREEN
   Model Mommy YELLOW GREEN
   

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8. Final points
   ●
   Factories are made of two parts
   ●
   Hypothesis could win
   ●
   Test code on GitHub:
   https://github.com/jamescooke/factory_audit/
   ●
   Full write-up tomorrow
   http://jamescooke.info/
   

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9. Thanks!
   ●
   @jamesfublo
   ●
   Ask questions
   ●
   Let’s talk more about testing
   ●
   Thanks for listening!
   Licensed under the
   Creative Commons Attribution-ShareAlike 3.0 Unported License.
   

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