public function testExecute()
 {
     $date = $this->setupAggregate();
     $invoicedMock = $this->getMockBuilder('Magento\\Sales\\Model\\ResourceModel\\Report\\Invoiced')->disableOriginalConstructor()->getMock();
     $invoicedMock->expects($this->once())->method('aggregate')->with($date);
     $this->invoicedFactoryMock->expects($this->once())->method('create')->will($this->returnValue($invoicedMock));
     $this->observer->execute();
 }