public function testHasRegionAndCodeAndNom()
 {
     $pays = new Pays('France');
     $region = new Region($pays, 11, 'Île-de-France');
     $departement = new Departement($region, 92, 'Hauts-de-Seine');
     $this->assertEquals(92, $departement->getCode());
     $this->assertEquals('Hauts-de-Seine', $departement->getNom());
     $this->assertEquals($region, $departement->getRegion());
     $this->assertContains($departement, $region->getDepartements());
 }