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RSpec Cheatsheet
require 'rails_helper'
RSpec.describe TodosController, :type => :controller do
describe "GET #index" do
#describe "POST #create" do
#describe "GET #show" do
#describe "PATCH #update" do (or PUT #update)
#describe "DELETE #destroy" do
#describe "GET #new" do
#describe "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:
render_views # ONLY have this if you're certain you need it
it "reads like a sentence (almost)" do
# Available HTTP methods: post, get, patch, put, delete, head
get :index
params = { id: 123 }
get :edit, params # old non-kwarg style
get :edit, params: params # new kwarg style
params = { widget: { description: 'Hello World' } }
params.merge!(format: :js) # Specify format for AJAX/JS responses (e.g. create.js.erb view)
post :create, params # old non-kwarg style
post :create, params: params # new kwarg style
# All optional kwargs:
post :create,
params: {}, # hash with HTTP parameters, may be nil
body: "...", # request body string, appropriately encoded (application/x-www-form-urlencoded or multipart/form-data)
session: {}, # hash of parameters to store in session, may be nil.
flash: {}, # hash of parameters to store in flash, may be nil.
format: :json, # Request format (string or symbol), defaults to nil.
as: :json # Content type must be symbol that corresponds to a mime type, defaults to nil.
# 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
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 # 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!!!"
# 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
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