Add tests for common build detailed status helpers

spec/lib/gitlab/ci/status/build/common_spec.rb

+require 'spec_helper'
+
+describe Gitlab::Ci::Status::Build::Common do
+  let(:user) { create(:user) }
+  let(:build) { create(:ci_build) }
+  let(:project) { build.project }
+
+  subject do
+    Gitlab::Ci::Status::Core
+      .new(build, user)
+      .extend(described_class)
+  end
+
+  describe '#has_action?' do
+    it { is_expected.not_to have_action }
+  end
+
+  describe '#has_details?' do
+    context 'when user has access to read build' do
+      before { project.team << [user, :developer] }
+
+      it { is_expected.to have_details }
+    end
+
+    context 'when user does not have access to read build' do
+      before { project.update(public_builds: false) }
+
+      it { is_expected.not_to have_details }
+    end
+  end
+
+  describe '#details_path' do
+    it 'links to the build details page' do
+      expect(subject.details_path).to include "builds/#{build.id}"
+    end
+  end
+end