It gives us full control of a variable that is otherwise in a global, uncontrolled state. Rspec is the second testing framework that is commonly used with Ruby on Rails projects. ![]() If you’ve ever seen ridiculous profiles on run times in RSpec - that’s probably because you’ve forgotten to Timecop.return, and the Ruby global date is still in an altered state.Īllowing the dependency on time to be injected from outside of the method call gives us flexibility in testing. First solution: write your own matcher: Second Solution: Timecop. What’s more, if you forget to Timecop.return afterwards, you’ve infected the global state of DateTime with a trait that will be shared across other tests. We’re changing something in a global state that just happens to have an effect on the published_at timestamp. Thankfully, for many years the timecop gem served as a way to freeze time and time travel during tests, so that any time that elapsed during the running of your tests did not affect the results. Reading the test, there’s no link between freezing the time and the command to publish the post. Replace Timecop With Rails’ Time Helpers in RSpec Time-sensitive tests can be a pain. My problem with this style of testing is that there’s no definition of intent. require: false gem timecop gem webrick end Windows does not include. ![]() Notice the hard dependency on - which is an indeterministic function that accesses a global state. 2.7.6 gem factorybotrails gem rspec-rails, > 4.1 gem rubocop. We use encapsulation and information hiding to provide a cleaner API to consumers, but if we need to access private state from tests, then an argument can be made that the information should be available at a different scope, and that there’s a flaw in the design of the API.Ĭonsider the testability of the following snippet. ![]() These ‘groping’ test tools have a tendency to be that hammer. Just because you have a hammer, doesn’t mean that you should treat every problem as a nail. A high number of comments might indicate that the code is well-documented and organized, and could be a sign of a helpful and disciplined development team. But if you’re using these tools on a fresh codebase, you’re violating object oriented best practices. This lack of comments puts rspec-timecop among the lowest one-third of all Ruby projects on Open Hub. If I’m testing a codebase that hasn’t considered object oriented best practices, it’s useful to have tools like Timecop that can give control over Ruby’s global date and time, or FakeWeb that intercepts HTTP calls. In the Ruby world we’ve got metaprogramming and the #send method which can pretty much do the same thing, but in a deceptively simple way. Groping test tools like TypeMock exist in the realm of statically typed languages to allow you to bypass encapsulation and access private members of the objects you’re testing. spec/features/comments/creation_spec.Kevin McKelvin Groping test tools and their effect on object oriented design spec/features/comments/creation_spec.rb:42:in `block (4 levels) in ' spec/features/comments/creation_spec.rb:76 Shared Example Group: "added comment" called from. ![]() #RSpec Failure Comment creation for image behaves like added comment adds single commentįailure/Error: expect(page).to have_text 'January 3rd, 2017'Įxpected to find text "January 3rd, 2017" in "John Snow First comment message January 2nd, 2017Remove" View (Angular template) #app/views/templates/. Shared_examples 'added comment' do |position:, text:|Įxpect(page).to have_text 'January 3rd, 2017' timecop DESCRIPTION A gem providing 'time travel' and 'time freezing' capabilities, making it dead simple to test time-dependent code. #spec/features/comments/creation_spec.rb feature 'Comment creation', type: :feature, js: true do vcr Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests. Guessing it's a UTC issue but not sure why these specs passed last time project was touched (~8-months ago)!?! Compare vcr vs rspec-timecop and see what are their differences. We have some tests (specs) that are failing around Date/Time.
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