public function testAssignPairsToDrawNullInscription2()
 {
     $inscriptions = [$this->inscription1, 'aaaa'];
     $categoryService = new CategoryService();
     $categoryService->setManager($this->em);
     $position1 = $categoryService->assignPairForDrawGame($inscriptions, 1, 0, 'pair1');
     $position2 = $categoryService->assignPairForDrawGame($inscriptions, 1, 0, 'pair2');
     $this->assertEquals($this->inscription1->getPair(), $position1);
     $this->assertEquals(null, $position2);
 }