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RSpec Cheatsheet
require 'rails_helper'
RSpec.describe TodosController, :type => :controller do
context "GET index" do
#context "POST create" do
#context "GET show" do
#context "PATCH update" do (or PUT update)
#context "DELETE destroy" do
#context "GET new" do
#context "GET edit" do
# NORMALLY, you DO NOT want render_views, or you only want to call it in
# a single context.
# More on render_views:
# https://www.relishapp.com/rspec/rspec-rails/v/3-1/docs/controller-specs/render-views
render_views # ONLY have this if you're certain you need it
it "reads like a sentence (almost)" do
get :index
params = { id: 123 }
get :edit, params
params = { widget: { description: 'Hello World' } }
params.merge!(format: :js) # Specify format for AJAX/JS responses (e.g. create.js.erb view)
post :create, params
# Testing 404s in controllers (assuming default Rails handling of RecordNotFound)
expect { delete :destroy, { id: 'unknown' } }.to raise_error(ActiveRecord::RecordNotFound)
# Rails `:symbolized` status codes at end of each status code page at http://httpstatus.es/
expect(response).to have_http_status(:success) # 200
expect(response).to have_http_status(:forbidden) # 403
expect(response).to redirect_to foo_path
expect(response).to render_template(:template_filename_without_extension)
expect(response).to render_template(:destroy)
# Need response.body? Requires render_views call outside "it" block (see above & read given URL)
expect(response.body).to match /Bestsellers/
expect(response.body).to include "Bestsellers"
expect(response.headers["Content-Type"]).to eq "text/html; charset=utf-8"
expect(response.headers["Content-Type"]).to eq "text/javascript; charset=utf-8"
# assigns(:foobar) accesses the @foobar instance variable
# the controller method made available to the view
# Think of assigns(:widgets) as @widgets in the controller method
expect(assigns(:widgets)).to eq([widget1, widget2, widget3])
# Think of assigns(:product) as @product in the controller method
expect(assigns(:product)).to eq(bestseller)
expect(assigns(:cat)).to be_cool # cat.cool is a boolean, google "rspec predicate matchers"
expect(assigns(:employee)).to be_a_new(Employee)
# Asserting flash messages
expect(flash[:notice]).to eq "Congratulations on buying our stuff!"
expect(flash[:error]).to eq "Buying our stuff failed :-("
expect(flash[:alert]).to eq "You didn't buy any of our stuff!!!"
# Oi Eliot - TODO: add cookies and session examples here
# Query the db to assert changes persisted
expect(Invoice.count).to eq(1)
# Reload from db an object fetched in test setup when its record in db
# is updated by controller method, otherwise you're testing stale data
employee.reload
invoice.reload
product.reload
widget.reload
end
end
end
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