index.html.erb

<div class="container">
  <div class="col-md-offset-3 col-md-6">
    <div class="index-form">
      <%= render partial: 'form' %>
    </div>
  </div>
</div>

index_spec.rb

require 'spec_helper'
require_relative '../../../../apps/web/views/home/index'

class NewReportParams < Lotus::Action::Params
  param :report do
    param :owner, presence: true
    param :repo, presence: true
  end
end

describe describe Web::Views::Home::Index do
  let(:params)    { NewReportParams.new({}) }
  let(:exposures) { Hash[params: params] }
  let(:template)  { Lotus::View::Template.new('apps/web/templates/home/index.html.erb') }
  let(:view)      { Web::Views::Home::Index.new(template, exposures) }
  let(:rendered)  { view.render }

  it 'displays list of errors when params contains errors' do
    params.valid?

    expect(rendered).to include('There was a problem with your submission')
    expect(rendered).to include('owner is required')
    expect(rendered).to include('repo is required')
  end
end

render_error.rb

-> rspec spec/web/views/home/index_spec.rb
F

Failures:

  1) RSpec::ExampleGroups::WebViewsHomeIndex displays list of errors when params contains errors
     Failure/Error: let(:rendered)  { view.render }
     NoMethodError:
       undefined method `render' for nil:NilClass
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/lotus-view-0.4.4/lib/lotus/view/rendering/template.rb:42:in `render'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/lotus-view-0.4.4/lib/lotus/view/rendering/layout_scope.rb:86:in `render'
     # apps/web/templates/home/index.html.erb:4:in `block in singleton class'
     # apps/web/templates/home/index.html.erb:-6:in `instance_eval'
     # apps/web/templates/home/index.html.erb:-6:in `singleton class'
     # apps/web/templates/home/index.html.erb:-8:in `__tilt_70301258220040'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/tilt-2.0.1/lib/tilt/template.rb:155:in `call'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/tilt-2.0.1/lib/tilt/template.rb:155:in `evaluate'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/tilt-2.0.1/lib/tilt/template.rb:96:in `render'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/lotus-view-0.4.4/lib/lotus/view/template.rb:39:in `render'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/lotus-view-0.4.4/lib/lotus/view/rendering.rb:117:in `rendered'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/lotus-view-0.4.4/lib/lotus/view/rendering.rb:131:in `layout'
     # /Users/kacper-golinski/.rvm/gems/ruby-2.2.1/gems/lotus-view-0.4.4/lib/lotus/view/rendering.rb:104:in `render'
     # ./spec/web/views/home/index_spec.rb:16:in `block (2 levels) in <top (required)>'
     # ./spec/web/views/home/index_spec.rb:21:in `block (2 levels) in <top (required)>'

Finished in 0.00374 seconds (files took 7.6 seconds to load)
1 example, 1 failure

Failed examples:

rspec ./spec/web/views/home/index_spec.rb:18 # RSpec::ExampleGroups::WebViewsHomeIndex displays list of errors when params contains errors