Add some initial specs for Files::MultiService class

spec/services/files/multi_service_spec.rb

+require "spec_helper"
+
+describe Files::MultiService do
+  subject { described_class.new(project, user, commit_params) }
+
+  let(:project) { create(:project, :repository) }
+  let(:user) { create(:user) }
+  let(:branch_name) { project.default_branch }
+  let(:action) { 'update' }
+
+  let(:actions) do
+    [
+      {
+        action: action,
+        file_path: 'files/ruby/popen.rb',
+        content: 'New content'
+      }
+    ]
+  end
+
+  let(:commit_params) do
+    {
+      commit_message: "Update File",
+      branch_name: branch_name,
+      start_branch: branch_name,
+      actions: actions
+    }
+  end
+
+  before do
+    project.team << [user, :master]
+  end
+
+  describe '#execute' do
+    context 'with a valid action' do
+      it 'returns a hash with the :success status ' do
+        results = subject.execute
+
+        expect(results[:status]).to eq(:success)
+      end
+    end
+
+    context 'with an invalid action' do
+      let(:action) { 'rename' }
+
+      it 'returns a hash with the :error status ' do
+        results = subject.execute
+
+        expect(results[:status]).to eq(:error)
+        expect(results[:message]).to match(/Unknown action/)
+      end
+    end
+  end
+end