WHs of TestingController, Services, Models & Helpers

-Gourav Tiwari

Pattern● Where to begin?● What to test?● What not to test?● When to stub/mock?

QQ: How to learn syntax?Practice, cheat-sheet

Controller● Where to begin?

■ request and response● What to test?

■ response, flash, instance variables, conditions● What not to test?

■ filters, e.g. authorization; separate routing tests● When to stub/mock?

■ model calls, service calls, third party API calls

Services● Where to begin?

■ small methods● What to test?

■ logic written in services● What not to test?

■ connection● When to stub/mock?

■ external calls, third party calls

Tests should pass even when you are not connected to internet

Model● Where to begin?

■ small methods, least dependency● What to test?

■ custom logic that you are writing● What not to test?

■ libraries, e.g. ActiveRecord’s create method● When to stub/mock?

■ calls to methods which are outside the model

Helpers● Where to begin?

■ small methods, least dependency● What to test?

■ custom logic● What not to test?

■ libraries, e.g. ActionView::Helpers’ methods● When to stub/mock?

■ methods outside helper

Mocking frameworksMock in Ralis with: Mocha/Rspec/flexmock/RR

Interesting articles/links:http://www.martinfowler.com/articles/mocksArentStubs.htmlhttps://github.com/rspec/rspec-mocks