Testing devise views with rspec

I wanted to do @MikeFogg's solution - I do something similar in another view spec to deal with Pundit - but of course I ran up against the issue @ChrisEdwards pointed out with regards to needing mocks.verify_partial_doubles = false.

However, I was not much interested in turning that off across my whole test suite, it's a good check, "generally recommended" and default in Rspec 4+.

I actually first posted a solution here where I reconfigured RSpec in before/after blocks, but I ran across a really, really easy way to do this, and it works great:

  before(:each) do
    without_partial_double_verification do
      allow(view).to receive(:resource).and_return(Student.new)
      allow(view).to receive(:resource_name).and_return(:student)
      allow(view).to receive(:devise_mapping).and_return(Devise.mappings[:student])
    end
    # other before_each configuration here as needed
  end

This has been around since 2016 and was originally called without_verifying_partial_doubles, but was renamed to the current without_partial_double_verification. Does not appear to be documented anywhere I can see.

And whaddya know? I found this answer where someone had a similar problem. The solution is to include the following code in your application helper:

def resource_name
  :user
end

def resource
  @resource ||= User.new
end

def devise_mapping
  @devise_mapping ||= Devise.mappings[:user]
end

This is necessary because devise is using certain helper methods in its controllers. If I access the views from my specs, however, these helper methods are not available, hence my tests fail. Putting these methods inside the application helper makes them accessible throughout the application, including my specs, and indeed the tests pass!

In rspec there's a configuration which doesn't allow you to stub out methods which are not defined. With rails 4 it's even standard behavior:

# spec/spec_helper.rb
config.mock_with :rspec do |mocks|
  mocks.verify_partial_doubles = true
end

Because of that the highest-voted answer doesn't work with devise helpers. Change verify_partial_doubles to false or use an actual helper.

Just another thought incase anyone runs into the same issue. I wasn't a huge fan of adding code to my helpers just to make it so tests can pass so I ended up adding this code in a before block in my tests:

before do
  view.stub(:resource).and_return(User.new)
  view.stub(:resource_name).and_return(:user)
  view.stub(:devise_mapping).and_return(Devise.mappings[:user])
end