public function testDeleteById()
{
$id = 1;
$entity = $this->getMockBuilder('Magento\\Sales\\Model\\Order\\Invoice')->disableOriginalConstructor()->getMock();
$entity->expects($this->once())->method('load')->with($id)->willReturn($entity);
$entity->expects($this->any())->method('getEntityId')->willReturn($id);
$this->invoiceMetadata->expects($this->once())->method('getNewInstance')->willReturn($entity);
$mapper = $this->getMockBuilder('Magento\\Sales\\Model\\ResourceModel\\Order\\Invoice')->disableOriginalConstructor()->getMock();
$mapper->expects($this->once())->method('delete')->with($entity);
$this->invoiceMetadata->expects($this->any())->method('getMapper')->willReturn($mapper);
$this->assertTrue($this->invoice->deleteById($id));
}
