`rspec` - comparing two arrays' lengths against each other

问题

Having 2 arrays in index method, I want to test the equality of the arrays' lengths but it's not working (the lengths of the arrays are equal after testing manually)

def index
    @countries = get_countries()
    @capitals = get_capitals()
end

Rspec file:

describe CountriesController do 
  describe 'index' do
    it 'countries.length == capitals.length' do
      expect(assigns(countries.length)).to eq (assigns(capitals.length))
    end
  end
end

回答1:

Doesn't look like you are making a request to that action... that is.. where is the get :index call?

回答2:

It should be like this:

describe CountriesController do 
  describe 'index' do
    it 'countries.length == capitals.length' do
      get :index
      expect(assigns(:countries).length).to eq assigns(:capitals).length
    end
  end
end

来源：https://stackoverflow.com/questions/38579733/rspec-comparing-two-arrays-lengths-against-each-other