chore: cross domain banner between APP_HOST_LEGACY and APP_HOST

spec/components/switch_domain_banner_component_spec.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe SwitchDomainBannerComponent, type: :component do
+  let(:app_host_legacy) { "demarches-simplifiees.fr" }
+  let(:app_host) { "demarches.gouv.fr" }
+
+  let(:user) { create(:user) }
+  let(:request_host) { app_host_legacy }
+  let(:path) { "/" }
+
+  before do
+    allow(Current).to receive(:host).and_return(app_host)
+    stub_const("ApplicationHelper::APP_HOST_LEGACY", app_host_legacy)
+    stub_const("ApplicationHelper::APP_HOST", app_host)
+
+    Flipper.enable(:switch_domain)
+  end
+
+  after do
+    Flipper.disable(:switch_domain)
+  end
+
+  subject(:rendered) do
+    with_request_url path, host: request_host, format: nil do
+      render_inline(described_class.new(user: user))
+    end
+  end
+
+  context "when request is already on APP_HOST" do
+    let(:request_host) { app_host }
+
+    it "notify about names change" do
+      expect(rendered.to_html).to include("demarches-simplifiees.fr")
+      expect(rendered.to_html).to include(app_host)
+      expect(rendered.to_html).not_to include("window.location")
+      expect(rendered.to_html).not_to include("Suivez ce lien")
+    end
+
+    context "when user has already set preferred domain" do
+      let(:user) { create(:user, preferred_domain: :demarches_gouv_fr) }
+
+      it "does not render the banner" do
+        expect(rendered.to_html).to be_empty
+      end
+    end
+  end
+
+  describe "URL generation" do
+    let(:path) { "/admin/procedures" }
+
+    it "generate an url to the new domain" do
+      expect(rendered.to_html).to have_link(APPLICATION_NAME, href: "http://demarches.gouv.fr/admin/procedures")
+      expect(rendered.to_html).not_to include("window.location")
+      expect(rendered.to_html).to include("Suivez ce lien")
+    end
+  end
+end