rspec interview questions
Top rspec frequently asked interview questions
I'd like to do something like this:
some_method.should_raise <any kind of exception, I don't care>
How should I do this?
some_method.should_raise exception
... doesn't work.
Source: (StackOverflow)
One (or a couple) of our tests are taking forever and we'd like to optimize them.
We have say 1000 tests so it's impractical for me to go through run each file.
Is there an easy to way to find the slow ones?
This is rspec 1.3
Source: (StackOverflow)
I tend to use before blocks and set instance variables in them and then use them across my examples, but recently I came upon let(). According to rspec docs, it is used to
... to define a memoized helper method. The value will be cached across multiple calls in the same example but not across examples.
My question is how is this different from using instance variables in before blocks? And also when should you use let() vs before()?
Source: (StackOverflow)
I have test-unit installed and rspec installed (along with -core, -expectations, -mocks and -rails version 2.6.x). When I run the command rails new foo, it uses test-unit to generate the test stub files instead of rspec.
Is there an option where I can tell rails to use rspec to generate the tests instead?
Source: (StackOverflow)
I'm using RSpec2 and Capybara for acceptance testing.
I would like to assert that link is disabled or not in Capybara. How can I do this?
Source: (StackOverflow)
In the controller spec, I can set http accept header like this:
request.accept = "application/json"
but in the request spec, "request" object is nil. So how can I do it here?
The reason I want to set http accept header to json is so I can do this:
get '/my/path'
instead of this
get '/my/path.json'
Source: (StackOverflow)
I want to be able to run a single spec file's tests — for the one file I'm editing, for example. rake spec executes all the specs. My project is not a Rails project, so rake spec:doc doesn't work.
Don't know if this matters, but here is my directory structure.
./Rakefile
./lib
./lib/cushion.rb
./lib/cushion
./lib/cushion/doc.rb
./lib/cushion/db.rb
./spec
./spec/spec.opts
./spec/spec_helper.rb
./spec/db_spec.rb
Source: (StackOverflow)
I often want to compare arrays and make sure that they contain the same elements, in any order. Is there a concise way to do this in RSpec?
Here are methods that aren't acceptable:
#to_set
For example:
array.to_set.should == another_array.to_set
This fails when the arrays contain duplicate items.
#sort
For example:
array.sort.should == another_array.sort
This fails when the arrays elements don't implement #<=>
Source: (StackOverflow)
I have a field with a proper label that I can fill in with capybara without a problem:
fill_in 'Your name', with: 'John'
I'd like to check the value it has before filling it in and can't figure it out.
If I add after the fill_in the following line:
find_field('Your name').should have_content('John')
That test fails, although the filling just before worked as I've verified by saving the page.
What am I missing?
Source: (StackOverflow)
I have found all kinds of links online but none that are current and show how to run a single test.
I have the following file:
/spec/controllers/groups_controller_spec.rb
What command in terminal do I use to run just that spec and in what dir do I run the command?
My gem file:
# Test ENVIRONMENT GEMS
group :development, :test do
gem "autotest"
gem "rspec-rails", "~> 2.4"
gem "cucumber-rails", ">=0.3.2"
gem "webrat", ">=0.7.2"
gem 'factory_girl_rails'
gem 'email_spec'
end
spec file
require 'spec_helper'
describe GroupsController do
include Devise::TestHelpers
describe "GET yourgroups" do
it "should be successful and return 3 items" do
Rails.logger.info 'HAIL MARRY'
get :yourgroups, :format => :json
response.should be_success
body = JSON.parse(response.body)
body.should have(3).items # @user1 has 3 permissions to 3 groups
end
end
end
Source: (StackOverflow)
It is pretty easy with the added generator of rspec-rails to setup RSpec for testing a Rails application. But how about adding RSpec for testing a gem in development?
I am not using jeweler or such tools. I just used Bundler (bundle gem my_gem) to setup the structure for the new gem and edit the *.gemspec manually.
I also added s.add_development_dependency "rspec", ">= 2.0.0" to gemspec and did a bundle install.
Is there some nice tutorial what to do next to get RSpec working?
Source: (StackOverflow)
When should I use specs for Rails application and when Cucumber (former rspec-stories)? I know how both work and actively use specs, of course. But it still feels weird to use Cucumber. My current view on this, is that it's convenient to use Cucumber when you're implementing application for the client and do not understand how the whole system is supposed to work yet.
But what if I'm doing my own project? For most of the time, I know how the parts of the system interact. All I need to do is to write a bunch of unit-tests. What are the possible situations when I would need Cucumber then?
And, as a corresponding second question: do I have to write specs if I write Cucumber stories? Wouldn't it be double-testing of the same thing?
Source: (StackOverflow)
How do I set global configuration for RSpec in Ubuntu.
Specifically so, --color and --format specdoc stay turned on, across all my projects (ie every time I run rspec anywhere).
Source: (StackOverflow)
What are the best practices on testing modules in rspec? I have some modules that get included in few models and for now I simply have duplicate tests for each model (with few differences). Is there a way to DRY it up?
Source: (StackOverflow)
Most of my tests are raising the following and I don't understand why. All methods call raise the 'authenticate' error. I've checked the code if there was a method called "authenticate" but there is no such method.
1) Admin::CommentsController handling GET to index is successful
Failure/Error: get :index
undefined method `authenticate!' for nil:NilClass
# ./spec/controllers/admin/comments_controller_spec.rb:9:in `block (3 levels) in <top (required)>'
124) PostsController handling GET for a single post should render show template
Failure/Error: get :show, :year => '2008', :month => '01', :day => '01', :slug => 'a-post'
undefined method `authenticate' for nil:NilClass
# ./app/controllers/application_controller.rb:18:in `set_current_user_for_model'
# ./spec/controllers/posts_controller_spec.rb:131:in `do_get'
# ./spec/controllers/posts_controller_spec.rb:140:in `block (3 levels) in <top (required)>'
The project can be found over there => https://github.com/agilepandas/enki in case you'd like to run the tests your self.
Source: (StackOverflow)