Adds rspec file for sast [ci skip]

spec/ee/spec/features/projects/merge_requests/merge_request_with_sast.rb

+require 'spec_helper'
+
+describe 'Merge request with sast', :js do
+  let(:user) { create(:user) }
+  let(:project) { create :project, :repository }
+  let(:pipeline) do
+    create(:ci_empty_pipeline, status: :created, project: project)
+  end
+  let(:build) do
+    create(
+      :ci_build,
+      :artifacts,
+      name: 'sast',
+      pipeline: pipeline,
+      options: {
+        artifacts: {
+          paths: ['gl-sast-report.json']
+        }
+      }
+    )
+  end
+  let(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
+
+  before do
+    allow(merge_request).to receive(:sast_artifact).and_return(build)
+    project.add_developer(user)
+    sign_in(user)
+
+    visit(merge_request_path(merge_request))
+    wait_for_requests
+  end
+
+  it 'shows sast information' do
+    expect(page).to have_content('1 security vulnerability detected')
+  end
+
+  it 'expands the information section' do
+    click_button('Expand')
+
+    expect(page).to have_content('message name goes here')
+    expect(page).to have_content('file name goes here')
+  end
+end
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