Add user research recruitment banner

Trello: https://trello.com/c/yGMU3sR2

This looks reasonable in Firefox on Linux but I need to check on a
wider variety of devices before deploying it.

We're only showing the banner on the dashboard so that we don't
overwhelm people by showing it everywhere.

Still to do:

- Hide the banner permanently once a user clicks on the "Sign up to take
  part in research" button.

- Allow users to hide the banner for the current session.

- Ensure it works and looks correct in all supported browsers.

app/assets/stylesheets/_user_research_recruitment_banner.scss

@@ -0,0 +1,18 @@
+.user-research-recruitment-banner {
+  background-color: $govuk-brand-colour;
+  padding-top: 3em;
+}
+
+.user-research-recruitment-banner__divider {
+  margin-top: 0;
+  border-bottom: 1px solid govuk-colour("white");
+}
+
+.user-research-recruitment-banner__title {
+  color: govuk-colour("white");
+  margin-bottom: 25px;
+}
+
+.user-research-recruitment-banner__intro {
+  color: govuk-colour("white");
+}

app/assets/stylesheets/application.scss

@@ -1,4 +1,5 @@
 @import "govuk_publishing_components/all_components";
+@import "user_research_recruitment_banner";
 
 // TODO: move into component
 .gem-c-success-alert,

app/controllers/application_controller.rb

@@ -69,4 +69,9 @@ def notify_bad_request(_exception)
   def redirect_to_prior_flow(args = {})
     redirect_to stored_location_for("2sv") || :root, args
   end
+
+  def show_user_research_recruitment_banner?
+    false
+  end
+  helper_method :show_user_research_recruitment_banner?
 end

app/controllers/root_controller.rb

@@ -14,4 +14,10 @@ def index
   def signin_required
     @application = ::Doorkeeper::Application.find_by(id: session.delete(:signin_missing_for_application))
   end
+
+private
+
+  def show_user_research_recruitment_banner?
+    true
+  end
 end

app/views/layouts/admin_layout.html.erb

@@ -11,6 +11,22 @@
     navigation_items: navigation_items,
   }%>
 
+  <% if show_user_research_recruitment_banner? %>
+    <section class="user-research-recruitment-banner">
+      <div class="govuk-width-container">
+        <hr class="user-research-recruitment-banner__divider govuk-section-break govuk-section-break--l">
+        <h1 class="user-research-recruitment-banner__title govuk-heading-xl">Help us improve GOV.UK Publishing</h1>
+        <p class="user-research-recruitment-banner__intro govuk-body">We're holding research sessions to make Publishing work better.</p>
+        <div>
+          <%= link_to 'Sign up to take part in research',
+                      'https://docs.google.com/forms/d/1Bdu_GqOrSR4j6mbuzXkFTQg6FRktRMQc8Y-q879Mny8/viewform',
+                      class: 'govuk-!-font-size-24 govuk-!-font-weight-bold govuk-button govuk-button--inverse'
+          %>
+        </div>
+      </div>
+    </section>
+  <% end %>
+
   <div class="govuk-width-container">
     <% if yield(:back_link).present? %>
       <%= render "govuk_publishing_components/components/back_link", href: yield(:back_link) %>

test/integration/user_research_recruitment_banner_test.rb

@@ -0,0 +1,38 @@
+require "test_helper"
+
+class UserResearchRecruitmentBannerTest < ActionDispatch::IntegrationTest
+  should "not display the banner on the login page" do
+    visit new_user_session_path
+
+    assert_not has_content?(user_research_recruitment_banner_title)
+  end
+
+  should "display the banner on the dashboard" do
+    user = create(:user, name: "user-name", email: "user@example.com")
+    visit new_user_session_path
+    signin_with(user)
+
+    assert has_content?(user_research_recruitment_banner_title)
+    assert has_link?("Sign up to take part in research", href: "https://docs.google.com/forms/d/1Bdu_GqOrSR4j6mbuzXkFTQg6FRktRMQc8Y-q879Mny8/viewform")
+  end
+
+  should "not display the banner on any page other than the dashboard" do
+    user = create(:user, name: "user-name", email: "user@example.com")
+    visit new_user_session_path
+    signin_with(user)
+
+    click_on "Change your email or password"
+
+    assert_not has_content?(user_research_recruitment_banner_title)
+  end
+
+  should "hide the banner until the next session"
+
+  should "hide the banner permanently if the user clicks the button to participate in user research"
+
+  private
+
+  def user_research_recruitment_banner_title
+    "Help us improve GOV.UK Publishing"
+  end
+end