diff --git a/spec/models/group_spec.rb b/spec/models/group_spec.rb
index 5d4674e3a9f..78c39548eb4 100644
--- a/spec/models/group_spec.rb
+++ b/spec/models/group_spec.rb
@@ -17,7 +17,11 @@ require 'spec_helper'
 describe Group do
   let!(:group) { create(:group) }
 
-  it { should have_many :projects }
+  describe "Associations" do
+    it { should have_many :projects }
+    it { should have_many :users_groups }
+  end
+
   it { should validate_presence_of :name }
   it { should validate_uniqueness_of(:name) }
   it { should validate_presence_of :path }
@@ -31,4 +35,11 @@ describe Group do
   describe :human_name do
     it { group.human_name.should == group.name }
   end
+
+  describe :add_users do
+    let(:user) { create(:user) }
+    before { group.add_users([user.id], UsersGroup::MASTER) }
+
+    it { group.users_groups.masters.map(&:user).should include(user) }
+  end
 end