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	diff --git a/app/models/membership.rb b/app/models/membership.rb
	index 359c757..bac65e5 100644
	--- a/app/models/membership.rb
	+++ b/app/models/membership.rb
	@@ -1,7 +1,8 @@
	class Membership < ActiveRecord::Base
	belongs_to :group
	belongs_to :user

	validates_presence_of :group
	validates_presence_of :user
	+ validates_uniqueness_of :user_id, scope: :group_id
	end
	diff --git a/test/factories/group.rb b/test/factories/group.rb
	index cd92dc8..03a9cb4 100644
	--- a/test/factories/group.rb
	+++ b/test/factories/group.rb
	@@ -1,5 +1,11 @@
	FactoryGirl.define do
	factory :group do
	sequence(:name) { \|n\| "group-#{n}" }
	+
	+ factory :group_with_users do
	+ after(:create) do \|group\|
	+ create_list(:user, 2).each { \|u\| group.users << u }
	+ end
	+ end
	end
	end
	diff --git a/test/factories/user.rb b/test/factories/user.rb
	new file mode 100644
	index 0000000..d095dcd
	--- /dev/null
	+++ b/test/factories/user.rb
	@@ -0,0 +1,6 @@
	+FactoryGirl.define do
	+ factory :user do
	+ sequence(:email) { \|n\| "user-#{n}@example.com" }
	+ password 'password'
	+ end
	+end
	diff --git a/test/models/membership_test.rb b/test/models/membership_test.rb
	new file mode 100644
	index 0000000..f61ed09
	--- /dev/null
	+++ b/test/models/membership_test.rb
	@@ -0,0 +1,13 @@
	+require 'test_helper'
	+
	+class MembershipTest < ActiveSupport::TestCase
	+
	+ test 'single membership for a group' do
	+ group = create(:group_with_users)
	+ user = group.users.first
	+
	+ assert_raise ActiveRecord::RecordInvalid do
	+ group.users << user
	+ end
	+ end
	+end