public function testContains()
{
$user = $this->createTestObject();
$user->setId(3);
$this->assertFalse($this->objectManager->contains($user));
$this->objectManager->persist($user);
$this->assertTrue($this->objectManager->contains($user));
$this->objectManager->flush();
$this->assertTrue($this->objectManager->contains($user));
$this->objectManager->clear();
$this->assertFalse($this->objectManager->contains($user));
}