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My notes for the QA Hangout

I participated on a hangout about QA with PHP, you can check it out here. I think It was a good one, we had even the right of a review.

The following content is a collections of notes I build to orient my talk on the event.

Braimstorm

  • Test ONLY business logic;

  • Write a new test VS add an assertion in the existing one Always reduce to a valuable busiess requirement

  • Test the smaller scope possible on your small tests If you prove the part you are proving the hole as well;

  • Start small On new features I usually put the test class and the class on the same file till I’m encouraged enough by it’s features to split;

  • Avoid databases if you can It’s slow and Doctrine somethimes trows exceptions so we have to rebuild the entire setup;

  • Coverage Use data structures that make special cases go away - Which is the ideal size to get started with the logic?

  • Write only tests that fail

  • Tests size Google don’t divide the tests in unity, integration,etc. They use the small, medium and big. I use an annotation size to define it

  • At google testing is called engineering of productivity

  • Medium tests can be used to test a hole feature Convert you browser request into a test when something fails. In php there is the var_export funciton that generates an array.

  • Make easy the reuse of features on tests On Compufácil we use a collection of traits on tests so we can avoid the trouble of instanciating may things. The traits accept mixed arguments and try to do the best to create the entity with only what the developer is wanting to pass to the test.

  • The refactor is a troublesome step If you see you can abstract, maybe your test will be totally desintegrated. So is nice to dismember the feature you want to test from the begining so you avoid some trouble with abstractions.

  • Abuse of the concept of factories. If you use a library to manage dependencies better, so on the factory you can load environments variables and configurations to make your object proper to run tests and go in production.

  • Don’t test what the language can do for you: php 7 brings scalar types and return types that can assert speed up testing

PHP7

Scalar types and return types for testing Expectations - to assert setup code Anonymous classes;

Steps TDD

- Write a test
- Make it pass with the fewer trouble possible
- Refactor
- Start again

Benefits

Confident refactoring

Tools

php-beautifier and phpcs to check for style problems 
pdepend - to generate statistics
pyresttest - to test API's
vfsStream - to test files
mockery - to create mocks
phpcop - to change dates

Books

Test-Driven Development By Example - Kent Beck How google tests software - James Whittaker