$definition = $this->entityAdapter->getDataDefinition();
$this->assertInstanceOf('\Drupal\Core\Entity\TypedData\EntityDataDefinitionInterface', $definition);
$this->assertEquals($definition->getEntityTypeId(), $this->entityTypeId);
$definition = $this->entityAdapter->getDataDefinition();
$this->assertInstanceOf('\Drupal\Core\Entity\TypedData\EntityDataDefinitionInterface', $definition);
$this->assertEquals($definition->getEntityTypeId(), $this->entityTypeId);