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Project: RSpec Rails 3-9

view spec

View specs are marked by :type => :view
or if you have set config.infer_spec_type_from_file_location!
by placing them in spec/views.

Use them to test the content of view templates
without invoking a specific controller.
They generally follow three steps:

assign(:widget, Widget.new)  # sets @widget = Widget.new in the view template

render

expect(rendered).to match(/text/)
  1. Use the assign method to set instance variables in the view.

  2. Use the render method to render the view.

  3. Set expectations against the resulting rendered template.

Scenarios
View specs render the described view file
Given
a file named "spec/views/widgets/index.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "widgets/index" do
  it "displays all the widgets" do
    assign(:widgets, [
      Widget.create!(:name => "slicer"),
      Widget.create!(:name => "dicer")
    ])

    render

    expect(rendered).to match /slicer/
    expect(rendered).to match /dicer/
  end
end
When
I run rspec spec/views
Then
the examples should all pass
View specs can have before block and nesting
Given
a file named "spec/views/widgets/index.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "widgets/index" do

  context "with 2 widgets" do
    before(:each) do
      assign(:widgets, [
        Widget.create!(:name => "slicer"),
        Widget.create!(:name => "dicer")
      ])
    end

    it "displays both widgets" do
      render

      expect(rendered).to match /slicer/
      expect(rendered).to match /dicer/
    end
  end
end
When
I run rspec spec/views
Then
the examples should all pass
View specs can explicitly render templates
Given
a file named "spec/views/widgets/widget.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "rendering the widget template" do
  it "displays the widget" do
    assign(:widget, Widget.create!(:name => "slicer"))

    render :template => "widgets/widget.html.erb"

    expect(rendered).to match /slicer/
  end
end
And
a file named "app/views/widgets/widget.html.erb" with:
<h2><%= @widget.name %></h2>
When
I run rspec spec/views
Then
the examples should all pass
View specs can render templates in layouts
Given
a file named "spec/views/widgets/widget.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "rendering the widget template" do
  context "with the inventory layout" do
    it "displays the widget" do
      assign(:widget, Widget.create!(:name => "slicer"))

      render :template => "widgets/widget.html.erb", :layout => "layouts/inventory"

      expect(rendered).to match /slicer/
    end
  end
end
And
a file named "app/views/widgets/widget.html.erb" with:
<h2><%= @widget.name %></h2>
And
a file named "app/views/layouts/inventory.html.erb" with:
<%= yield %>
When
I run rspec spec/views
Then
the examples should all pass
View specs can have description that includes the format and handler
Given
a file named "spec/views/widgets/widget.xml.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "widgets/widget.html.erb" do
  it "renders the HTML template" do
    render

    expect(rendered).to match /HTML/
  end
end

RSpec.describe "widgets/widget.xml.erb" do
  it "renders the XML template" do
    render

    expect(rendered).to match /XML/
  end
end
And
a file named "app/views/widgets/widget.html.erb" with:
HTML
And
a file named "app/views/widgets/widget.xml.erb" with:
XML
When
I run rspec spec/views
Then
the examples should all pass
View specs can render locals in a partial
Given
a file named "spec/views/widgets/_widget.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "rendering locals in a partial" do
  it "displays the widget" do
    widget = Widget.create!(:name => "slicer")

    render :partial => "widgets/widget.html.erb", :locals => {:widget => widget}

    expect(rendered).to match /slicer/
  end
end
And
a file named "app/views/widgets/_widget.html.erb" with:
<h3><%= widget.name %></h3>
When
I run rspec spec/views
Then
the examples should all pass
View specs can render locals in an implicit partial
Given
a file named "spec/views/widgets/_widget.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "rendering locals in a partial" do
  it "displays the widget" do
    widget = Widget.create!(:name => "slicer")

    render "widgets/widget", :widget => widget

    expect(rendered).to match /slicer/
  end
end
And
a file named "app/views/widgets/_widget.html.erb" with:
<h3><%= widget.name %></h3>
When
I run rspec spec/views
Then
the examples should all pass
  • @rails_pre_5
View specs can render text
Given
a file named "spec/views/widgets/direct.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "rendering text directly" do
  it "displays the given text" do

    render :text => "This is directly rendered"

    expect(rendered).to match /directly rendered/
  end
end
When
I run rspec spec/views
Then
the examples should all pass
  • @rails_post_5
View specs can render text
Given
a file named "spec/views/widgets/direct.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "rendering text directly" do
  it "displays the given text" do

    render :plain => "This is directly rendered"

    expect(rendered).to match /directly rendered/
  end
end
When
I run rspec spec/views
Then
the examples should all pass
View specs can stub a helper method
Given
a file named "app/helpers/application_helper.rb" with:
module ApplicationHelper
  def admin?
    false
  end
end
And
a file named "app/views/secrets/index.html.erb" with:
<%- if admin? %>
  <h1>Secret admin area</h1>
<%- end %>
And
a file named "spec/views/secrets/index.html.erb_spec.rb" with:
require 'rails_helper'

RSpec.describe 'secrets/index' do
  before do
    allow(view).to receive(:admin?).and_return(true)
  end

  it 'checks for admin access' do
    render
    expect(rendered).to match /Secret admin area/
  end
end
When
I run rspec spec/views/secrets
Then
the examples should all pass
View specs use symbols for keys in `request.path_parameters` to match Rails style
Given
a file named "spec/views/widgets/index.html.erb_spec.rb" with:
require "rails_helper"

RSpec.describe "controller.request.path_parameters" do
  it "matches the Rails environment by using symbols for keys" do
    [:controller, :action].each { |k| expect(controller.request.path_parameters.keys).to include(k) }
  end
end
When
I run rspec spec/views
Then
the examples should all pass
View spec actions that do not require extra parameters have `request.fullpath` set
Given
a file named "spec/views/widgets/index.html.erb_spec.rb" with:
  require "rails_helper"

  RSpec.describe "widgets/index" do
    it "has a request.fullpath that is defined" do
      expect(controller.request.fullpath).to eq widgets_path
    end
  end
When
I run rspec spec/views
Then
the examples should all pass
View spec actions that require extra parameters have `request.fullpath` set when the developer supplies them
Given
a file named "spec/views/widgets/show.html.erb_spec.rb" with:
  require "rails_helper"

  RSpec.describe "widgets/show" do
    it "displays the widget with id: 1" do
      widget = Widget.create!(:name => "slicer")
      controller.extra_params = { :id => widget.id }

      expect(controller.request.fullpath).to eq widget_path(widget)
    end
  end
When
I run rspec spec/views
Then
the examples should all pass

Last published about 1 month ago by Jon Rowe.