Added tests for merge_request_status partial

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

+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, created_at: 1.month.ago, state: :closed)
+
+    render partial: 'projects/issues/merge_requests_status',
+           locals: { merge_request: merge_request, css_class: '' }
+
+    expect(rendered).to match("Closed")
+  end
+end