Ruby on Rails Quality Control & Assurance 4

Question 1

When RSpec's `--bisect` flag is used, what problem does it solve?

Accepted Answer

Identifies the minimum set of examples that reproduces an order-dependent failure

Answer

`--bisect` uses binary search to find the smallest subset of tests whose ordering causes a specific example to fail, isolating order-dependent bugs.

Question 2

In Rails, what is the purpose of `config.action_mailer.delivery_method = :test` in the test environment?

Accepted Answer

Stores sent emails in `ActionMailer::Base.deliveries` array instead of sending them

Answer

The `:test` delivery method intercepts outgoing email into an in-memory array so tests can assert on email content without actual delivery.

Question 3

Which Capybara method asserts that a specific text is NOT visible on the page?

Accepted Answer

expect(page).not_to have_text('...')

Answer

RSpec's negation `not_to have_text` (or `have_no_text`) correctly waits for the text to disappear before asserting its absence.

Question 4

What does `rails test:system` run that `rails test` does not?

Accepted Answer

System tests using a real browser driver like Selenium or Cuprite

Answer

`rails test:system` runs tests in `test/system/` that use a browser driver, while `rails test` runs unit/integration tests without browser automation.

Question 5

In FactoryBot, what is a `trait` used for?

Accepted Answer

Define optional attribute overrides that can be mixed into factory instances

Answer

Traits group related attribute overrides (e.g., `trait :admin`) that can be applied selectively when building instances with `create(:user, :admin)`.

Ruby on Rails Practice Test

Ruby on Rails Practice Test

Ruby on Rails Quality Control & Assurance 4