public function testRemoveSchool()
 {
     // new entity
     $department = new Department();
     $school1 = new School();
     $school1->setName("School1");
     $school2 = new School();
     $school2->setName("school2");
     $school3 = new School();
     $school3->setName("school3");
     // Use the addSchool method
     $department->addSchool($school1);
     $department->addSchool($school2);
     $department->addSchool($school3);
     // Remove $school1 from department
     $department->removeSchool($school1);
     // Schools are stored in an array
     $schools = $department->getSchools();
     // Loop through the array
     foreach ($schools as $school) {
         // Assert the result
         $this->assertNotEquals($school1, $school);
     }
 }