How do I test controllers in Rails?

How do I test controllers in Rails?

To test controllers in Rails, you can use RSpec or Minitest. Do you have a preference for one?

I prefer RSpec. Can you give me an example?

Sure! Here's a simple example:

RSpec.describe UsersController, type: :controller do
  describe 'GET #index' do
    it 'returns a success response' do
      get :index
      expect(response).to be_successful
    end
  end
end

What about testing for JSON responses?

You can test JSON responses by checking the response format. For example:

it 'returns JSON data' do
  get :index, format: :json
  expect(response.content_type).to eq('application/json')
end