Merge branch '57428-actionview-template-error-undefined-method-for-nil-nilclass' into 'master'

Resolve "ActionView::Template::Error: undefined method `>' for nil:NilClass"

Closes #57428

See merge request gitlab-org/gitlab-ce!25028

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

@@ -12,11 +12,14 @@
   - mr_status_class = 'closed'
 - else
   - mr_status_date = merge_request.created_at
-  - mr_status_title = _('Opened')
+  - mr_status_title = mr_status_date ? _('Opened') : _('Open')
   - mr_status_icon = 'issue-open-m'
   - mr_status_class = 'open'
 
-- mr_status_tooltip = "<div><span class=\"bold\">#{mr_status_title}</span> #{time_ago_in_words(mr_status_date)} ago</div><span class=\"text-tertiary\">#{l(mr_status_date.to_time, format: time_format)}</span>"
+- if mr_status_date
+  - mr_status_tooltip = "<div><span class=\"bold\">#{mr_status_title}</span> #{time_ago_in_words(mr_status_date)} ago</div><span class=\"text-tertiary\">#{l(mr_status_date.to_time, format: time_format)}</span>"
+- else
+  - mr_status_tooltip = "<div><span class=\"bold\">#{mr_status_title}</span></div>"
 
 %span.mr-status-wrapper.suggestion-help-hover{ class: css_class, data: { toggle: 'tooltip', placement: 'bottom', html: 'true', title: mr_status_tooltip } }
   = sprite_icon(mr_status_icon, size: 16, css_class: "merge-request-status #{mr_status_class}")

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

+# frozen_string_literal: true
+require 'spec_helper'
+
+describe 'projects/issues/_merge_requests_status.html.haml' do
+  it 'shows date of status change in tooltip' do
+    merge_request = create(:merge_request, created_at: 1.month.ago)
+
+    render partial: 'projects/issues/merge_requests_status',
+           locals: { merge_request: merge_request, css_class: '' }
+
+    expect(rendered).to match("Opened.*about 1 month ago")
+  end
+
+  it 'shows only status in tooltip if date is not set' do
+    merge_request = create(:merge_request, state: :closed)
+
+    render partial: 'projects/issues/merge_requests_status',
+           locals: { merge_request: merge_request, css_class: '' }
+
+    expect(rendered).to match("Closed")
+  end
+end