class MessagesController < ApplicationController
  before_action :require_user

  def create
    message = current_user.messages.build(message_params)
    if message.save
      redirect_to root_path
    end
  end

  private

  def message_params
    params.require(:message).permit(:body)
  end
end

RSpec.describe MessagesController, type: :controller do
  describe 'signed user' do
    before do
      user = User.create!(username: 'John', password: 'test123')
    end

    describe 'GET #create' do
      it 'create message' do
        expect do
          post :create, params: { message: { body: 'Please work!' } }
        end.to change(Message, :count).by(1)
        expect(response).to have_http_status(:redirect)
      end
    end
  end
end