Add a "View in GitLab" link in notification emails

When an email notification concerns a specific object (issue, note,
merge request, etc.), add a link to the footer of the email that opens
the item's page in a web browser.

Rationale:

* The link is predictable: always the same text, always at the same
location, like any reliable tool.

* It allows to remove the inline-title in many emails, and leave only
the actual content of the message.

1 files changed, 6 insertions, 0 deletions

diff --git a/spec/mailers/notify_spec.rb b/spec/mailers/notify_spec.rb
index 6ba4d97ad4a..6b8d7a6f047 100644
--- a/spec/mailers/notify_spec.rb
+++ b/spec/mailers/notify_spec.rb
@@ -468,6 +468,8 @@ describe Notify do
     let(:example_site_path) { root_path }
     let(:user) { create(:user) }
     let(:compare) { Gitlab::Git::Compare.new(project.repository.raw_repository, 'cd5c4bac', 'b1e6a9db') }
+    let(:commits) { Commit.decorate(compare.commits) }
+    let(:diff_path) { project_compare_path(project, from: commits.first, to: commits.last) }
 
     subject { Notify.repository_push_email(project.id, 'devs@company.name', user.id, 'master', compare) }
 
@@ -492,5 +494,9 @@ describe Notify do
     it 'includes diffs' do
       should have_body_text /Checkout wiki pages for installation information/
     end
+
+    it 'contains a link to the diff' do
+      should have_body_text /#{diff_path}/
+    end
   end
 end