Rspec Rails cheatsheet with expect syntax (including capybara matchers)

rspec_rails_cheetsheet.rb

# Model

expect(@user).to have(1).error_on(:username) # checks whether there is an error in username
expect(@user.errors[:username]).to include("can't be blank") # check for the error message

# Rendering

expect(response).to render_template(:index)

# Redirecting

expect(response).to redirect_to(movies_path)

# Capybara Matchers

expect(response.body).to have_content("Hello world")
expect(response.body).to_not have_content("Hello world")

expect(response.body).to have_css("input#movie_title")
expect(response.body).to have_css("input", count: 3) # true if there are 3 input tags in response
expect(response.body).to have_css("input", maximum: 3) # true if there or fewer or equal to 3 input tags
expect(response.body).to have_css("input", minimum: 3) # true if there are minimum of 3 input tags
expect(response.body).to have_css("input", between: 1..3) # true if there 1 to 3 input tags
expect(response.body).to have_css("p a", text: "hello") # true if there is a anchor tag with text hello
expect(response.body).to have_css("p a", text: /[hH]ello(.+)/i) # true if there is a anchor tag with text matching regex

expect(response.body).to have_xpath("//a")
expect(response.body).to have_xpath("//a", href: "google.com")
expect(response.body).to have_xpath("//a[@href='google.com']")
expect(response.body).to have_xpath("//a[contains(.,'some string')]")
expect(response.body).to have_xpath("//p//a", text: /re[dab]i/i, count: 1)

# Can take both xpath and css as input and can take arguments similar to both have_css and have_xpath

expect(response.body).to have_selector(:xpath, "//p/h1")
expect(response.body).to have_selector(:css, "p a#movie_edit_path")

# For making capybara to take css as default selector

Capybara.default_selector = :css
expect(response.body).to have_selector("input") # checks for the presence of the input tag
expect(response.body).to have_selector("input", value: "Twelve Angry Men") # checks for input tag with value
expect(response.body).to_not have_selector("input")

# For making capybara to take xpath as default selector

Capybara.default_selector = :xpath
expect(response.body).to have_selector("//input") # checks for the presence of the input tag
expect(response.body).to have_selector("//input", value: "Twelve Angry Men") # checks for input tag with value

# To access elements inside form

expect(response.body).to have_field("FirstName") # checks for presence of a input field named FirstName in a form
expect(response.body).to have_field("FirstName", value: "Rambo")
expect(response.body).to have_field("FirstName", with: "Rambo")

# Checking for a link

expect(response.body).to have_link("Foo")
expect(response.body).to have_link("Foo", href: "google.com")
expect(response.body).to_not have_link("Foo", href: "google.com")