diff --git a/lib/noosfero/api/helpers.rb b/lib/noosfero/api/helpers.rb
index abf2bac..29455eb 100644
--- a/lib/noosfero/api/helpers.rb
+++ b/lib/noosfero/api/helpers.rb
@@ -94,6 +94,7 @@
         if params[:categories_ids]
           articles = articles.joins(:categories).where('category_id in (?)', params[:categories_ids])
         end
+        articles
       end
 
       def find_task(asset, id)
diff --git a/test/unit/api/articles_test.rb b/test/unit/api/articles_test.rb
index a9dcbd0..e7cc2be 100644
--- a/test/unit/api/articles_test.rb
+++ b/test/unit/api/articles_test.rb
@@ -3,6 +3,7 @@ require File.dirname(__FILE__) + '/test_helper'
 class ArticlesTest < ActiveSupport::TestCase
 
   def setup
+    Environment.destroy_all
     login_api
   end
 
diff --git a/test/unit/api/test_helper.rb b/test/unit/api/test_helper.rb
index 4c714c3..4c572c3 100644
--- a/test/unit/api/test_helper.rb
+++ b/test/unit/api/test_helper.rb
@@ -9,7 +9,8 @@ class ActiveSupport::TestCase
   end
 
   def login_api
-    @user = User.create!(:login => 'testapi', :password => 'testapi', :password_confirmation => 'testapi', :email => 'test@test.org', :environment => Environment.default)
+    @environment = fast_create(Environment, :is_default => true)
+    @user = User.create!(:login => 'testapi', :password => 'testapi', :password_confirmation => 'testapi', :email => 'test@test.org', :environment => @environment)
     @user.activate
     @person = @user.person
 
@@ -18,7 +19,7 @@ class ActiveSupport::TestCase
     @private_token = json["private_token"]
     @params = {:private_token => @private_token}
   end
-  attr_accessor :private_token, :user, :person, :params
+  attr_accessor :private_token, :user, :person, :params, :environment
 
   private
 
--
libgit2 0.21.2