Ruby on Rails Quality Control & Assurance 3

Question 1

In Minitest, which assertion checks that two objects are the same object instance (identity, not equality)?

Accepted Answer

assert_same

Answer

`assert_same` uses `equal?` (object identity via `object_id`) rather than `==` to verify two variables reference the exact same object.

Question 2

Which Rails test helper method allows you to test controller actions that require authentication by simulating a logged-in user?

Accepted Answer

sign_in (Devise test helper)

Answer

Devise provides `sign_in` as a test helper that populates Warden's test env, bypassing actual authentication for controller and request specs.

Question 3

What is the role of `shared_examples` in RSpec?

Accepted Answer

Define reusable groups of examples that can be included in multiple describe blocks

Answer

`shared_examples` lets you define a named group of examples once and include it with `it_behaves_like` wherever the same behavior must be verified.

Question 4

Which RuboCop cop category enforces Rails-specific style rules like using `presence` instead of `blank?` checks?

Accepted Answer

RuboCop-Rails

Answer

The `rubocop-rails` extension adds cops specific to Rails idioms, such as `Rails/Blank` and `Rails/Present`, on top of core RuboCop.

Question 5

In a Rails request spec, which HTTP method helper would you use to test a JSON API endpoint that creates a resource?

Accepted Answer

post path, params: data, headers: { 'Content-Type' => 'application/json' }

Answer

Rails integration test helpers (`get`, `post`, `patch`, `delete`) accept a `params` hash and `headers` hash for full HTTP simulation.

Ruby on Rails Practice Test