added two tests for the micropost model.  simply checking to see if it responds to it's two attributes :content and :user_id.  using rspec with the factories gem, it creates a factory to make micropost objects, which is cool.  Set a user to FactoryGirl.create(;user) and then used this user id in the micropost that was created with Micropost.new as the user id attribute in the micropost.  Then, using rspec command subject { @micropost } used it {should respont_to(:content) }   /n  it { should respond_to(user_id) } to make sure that it responded to it's attributes.