add time zone to conference_program, add tests

app/overrides/decidim/conferences/conference_program/_program_meeting/add_time_zone.html.erb.deface

@@ -0,0 +1,6 @@
+<!-- replace '.programme-time' -->
+
+<div class="column medium-2 programme-time">
+  <%= gpc_time_format start_time %> – <%= gpc_time_format end_time %>
+  <%= gpc_time_zone(start_time) %>
+</div>

spec/system/conference_spec.rb

@@ -1,7 +1,25 @@
 # frozen_string_literal: true
 
 require "rails_helper"
-
+require "selenium/webdriver"
+
+Capybara.register_driver :headless_chrome do |app|
+  options = Selenium::WebDriver::Chrome::Options.new
+  options.args << "--explicitly-allowed-ports=#{Capybara.server_port}"
+  options.args << "--headless-new"
+  options.args << "--no-sandbox"
+  options.args << if ENV["BIG_SCREEN_SIZE"].present?
+                    "--window-size=1920,3000"
+                  else
+                    "--window-size=1920,1080"
+                  end
+  options.args << "--ignore-certificate-errors" if ENV["TEST_SSL"]
+  Capybara::Selenium::Driver.new(
+    app,
+    browser: :chrome,
+    options: options
+  )
+end
 describe "Visit a conference", type: :system do
   let(:organization) { create :organization }
   let(:conference) { create :conference, slug: slug, registrations_enabled: registrations_enabled, organization: organization }
@@ -76,4 +94,34 @@
       it_behaves_like "no links"
     end
   end
+
+  context "when conference program show" do
+    let(:organization) { create :organization, time_zone: "UTC" }
+    let!(:component) { create(:component, manifest_name: :meetings, participatory_space: conference) }
+    let!(:conference_speakers) { create_list(:conference_speaker, 3, :with_meeting, conference: conference, meetings_component: component) }
+    let(:meetings) { Decidim::ConferenceMeeting.where(component: component) }
+    let!(:user) { create(:user, :confirmed, organization: organization, time_zone: timezone) }
+    let(:timezone) { "CET" }
+
+    context "when the user is logged in" do
+      before do
+        sign_in user
+        visit decidim_conferences.conference_conference_program_path(conference, component)
+      end
+
+      it "shows user's time zone" do
+        expect(page).to have_content("CET")
+      end
+    end
+
+    context "when the user is not logged in" do
+      before do
+        visit decidim_conferences.conference_conference_program_path(conference, component)
+      end
+
+      it "shows the organization's time zone" do
+        expect(page).to have_content("UTC")
+      end
+    end
+  end
 end