postal/spec/app/models/user_spec.rb

require 'rails_helper'

describe User do

  context "model" do
    subject(:user) { create(:user) }

    it "should have a UUID" do
      expect(user.uuid).to be_a String
      expect(user.uuid.length).to eq 36
    end
  end

  context ".authenticate" do
    it "should not authenticate users with invalid emails" do
      expect { User.authenticate('nothing@nothing.com', 'hello') }.to raise_error(Postal::Errors::AuthenticationError) do |e|
        expect(e.error).to eq 'InvalidEmailAddress'
      end
    end

    it "should not authenticate users with invalid passwords" do
      user = create(:user)
      expect { User.authenticate(user.email_address, 'hello') }.to raise_error(Postal::Errors::AuthenticationError) do |e|
        expect(e.error).to eq 'InvalidPassword'
      end
    end

    it "should authenticate valid users" do
      user = create(:user)
      auth_user = nil
      expect { auth_user = User.authenticate(user.email_address, 'passw0rd') }.to_not raise_error
      expect(auth_user).to eq user
    end
  end

end