diff --git a/test/unit/principal_test.rb b/test/unit/principal_test.rb
index f51527b0a..bc7e9605b 100644
--- a/test/unit/principal_test.rb
+++ b/test/unit/principal_test.rb
@@ -33,12 +33,20 @@ class PrincipalTest < ActiveSupport::TestCase
     assert_equal projects.map(&:principals).flatten.sort, Principal.member_of(projects).sort
   end
 
+  def test_member_of_scope_should_be_empty_for_no_projects
+    assert_equal [], Principal.member_of([]).sort
+  end
+
   def test_not_member_of_scope_should_return_users_that_have_no_memberships
     projects = Project.find_all_by_id(1, 2)
     expected = (Principal.all - projects.map(&:memberships).flatten.map(&:principal)).sort
     assert_equal expected, Principal.not_member_of(projects).sort
   end
 
+  def test_not_member_of_scope_should_be_empty_for_no_projects
+    assert_equal [], Principal.not_member_of([]).sort
+  end
+
   context "#like" do
     setup do
       Principal.generate!(:login => 'login')