added tests

spec/controllers/code_ocean/files_controller_spec.rb

@@ -1,9 +1,35 @@
 require 'rails_helper'
 
 describe CodeOcean::FilesController do
-  let(:user) { FactoryGirl.build(:admin) }
+  let(:user) { FactoryGirl.create(:admin) }
   before(:each) { allow(controller).to receive(:current_user).and_return(user) }
 
+  describe 'POST #create' do
+    let(:submission) { FactoryGirl.create(:submission, user: user) }
+
+    context 'with a valid file' do
+      let(:request) { Proc.new { post :create, code_ocean_file: FactoryGirl.build(:file, context: submission).attributes, format: :json } }
+      before(:each) { request.call }
+
+      expect_assigns(file: CodeOcean::File)
+
+      it 'creates the file' do
+        expect { request.call }.to change(CodeOcean::File, :count)
+      end
+
+      expect_json
+      expect_status(201)
+    end
+
+    context 'with an invalid file' do
+      before(:each) { post :create, code_ocean_file: {context_id: submission.id, context_type: Submission}, format: :json }
+
+      expect_assigns(file: CodeOcean::File)
+      expect_json
+      expect_status(422)
+    end
+  end
+
   describe 'DELETE #destroy' do
     let(:exercise) { FactoryGirl.create(:fibonacci) }
     let(:request) { Proc.new { delete :destroy, id: exercise.files.first.id } }