Added spec tests

spec/features/merge_requests/merge_immediately_with_pipeline_spec.rb

+require 'spec_helper'
+
+feature 'Merge immediately', :feature, :js do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :public) }
+
+  let(:merge_request) do
+    create(:merge_request_with_diffs, source_project: project,
+                                      author: user,
+                                      title: 'Bug NS-04')
+  end
+
+  let(:pipeline) do
+    create(:ci_pipeline, project: project,
+                         sha: merge_request.diff_head_sha,
+                         ref: merge_request.source_branch)
+  end
+
+  before { project.team << [user, :master] }
+
+  context 'when there is active pipeline for merge request' do
+    background do
+      create(:ci_build, pipeline: pipeline)
+    end
+
+    before do
+      login_as user
+      visit namespace_project_merge_request_path(merge_request.project.namespace, merge_request.project, merge_request)
+    end
+
+    it 'enables merge immediately' do
+      page.within '.mr-widget-body' do
+        find('.dropdown-toggle').click
+
+        click_link 'Merge Immediately'
+
+        expect(find('.js-merge-button')).to have_content('Merge in progress')
+      end
+    end
+  end
+end