Correction tests UserGroups

tests/library/Class/UserGroupCategorieTest.php

@@ -36,7 +36,7 @@ class UserGroupCategorieWithNoGroupTest extends Storm_Test_ModelTestCase {
 
 	/** @test **/
 	public function associationShouldNotHaveUserGroup() {
-		$this->assertEmpty($this->_association->getUserGroup());
+		$this->assertEmpty($this->_association->getUserGroups());
 
 	}