Allow reporters to see the service desk email address

Changelog: added

app/views/projects/issues/_service_desk_info_content.html.haml

 - service_desk_enabled = @project.service_desk_enabled?
 
 - can_edit_project_settings = can?(current_user, :admin_project, @project)
+- can_admin_issues = can?(current_user, :admin_issue, @project)
 - title_text = s_("ServiceDesk|Use Service Desk to connect with your users and offer customer support through email right inside GitLab")
 
 .non-empty-state.media
@@ -10,7 +11,7 @@
   .gl-mt-3.gl-ml-3
     %h5= title_text
 
-    - if can_edit_project_settings && service_desk_enabled
+    - if can_admin_issues && service_desk_enabled
       %p
         = s_("ServiceDesk|Your users can send emails to this address:")
         %code= @project.service_desk_address

spec/views/projects/issues/_service_desk_info_content.html.haml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'projects/issues/_service_desk_info_content' do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:user) { create(:user) }
+  let_it_be(:service_desk_address) { 'address@example.com' }
+
+  before do
+    assign(:project, project)
+    allow(project).to receive(:service_desk_address).and_return(service_desk_address)
+    allow(view).to receive(:current_user).and_return(user)
+  end
+
+  context 'when service desk is disabled' do
+    before do
+      allow(project).to receive(:service_desk_enabled?).and_return(false)
+    end
+
+    context 'when the logged user is at least maintainer' do
+      before do
+        project.add_maintainer(user)
+      end
+
+      it 'shows the info including the project settings link', :aggregate_failures do
+        render
+
+        expect(rendered).to have_text('Use Service Desk')
+        expect(rendered).not_to have_text(service_desk_address)
+        expect(rendered).to have_link(href: "/#{project.full_path}/edit")
+      end
+    end
+
+    context 'when the logged user is at only a developer' do
+      before do
+        project.add_developer(user)
+      end
+
+      it 'shows the info without the project settings link', :aggregate_failures do
+        render
+
+        expect(rendered).to have_text('Use Service Desk')
+        expect(rendered).not_to have_text(service_desk_address)
+        expect(rendered).not_to have_link(href: "/#{project.full_path}/edit")
+      end
+    end
+  end
+
+  context 'when service desk is enabled' do
+    before do
+      allow(project).to receive(:service_desk_enabled?).and_return(true)
+    end
+
+    context 'when the logged user is at least reporter' do
+      before do
+        project.add_reporter(user)
+      end
+
+      it 'shows the info including the email address', :aggregate_failures do
+        render
+
+        expect(rendered).to have_text('Use Service Desk')
+        expect(rendered).to have_text(service_desk_address)
+        expect(rendered).not_to have_link(href: "/#{project.full_path}/edit")
+      end
+    end
+
+    context 'when the logged user is at only a guest' do
+      before do
+        project.add_guest(user)
+      end
+
+      it 'shows the info without the email address', :aggregate_failures do
+        render
+
+        expect(rendered).to have_text('Use Service Desk')
+        expect(rendered).not_to have_text(service_desk_address)
+        expect(rendered).not_to have_link(href: "/#{project.full_path}/edit")
+      end
+    end
+
+    context 'when user is not logged in' do
+      let(:user) { nil }
+
+      it 'shows the info without the email address', :aggregate_failures do
+        render
+
+        expect(rendered).to have_text('Use Service Desk')
+        expect(rendered).not_to have_text(service_desk_address)
+        expect(rendered).not_to have_link(href: "/#{project.full_path}/edit")
+      end
+    end
+  end
+end