InvoicedTest.php

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<?php
namespace Magento\Sales\Model\ResourceModel\Report\Invoiced\Collection;

class InvoicedTest extends \PHPUnit\Framework\TestCase
{
    private $collection;

    private $objectManager;

    protected function setUp()
    {
        $this->objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();

        $this->collection = $this->objectManager->create(
            \Magento\Sales\Model\ResourceModel\Report\Invoiced\Collection\Invoiced::class
        );
        $this->collection->setPeriod('day')
            ->setDateRange(null, null)
            ->addStoreFilter([1]);
    }

    public function testGetItems()
    {

        $order = $this->objectManager->create(\Magento\Sales\Model\Order::class);
        $order->loadByIncrementId('100000001');
        $invoiceCreatedAt = $order->getInvoiceCollection()
            ->getFirstItem()
            ->getCreatedAt();
        $dateTime = $this->objectManager->create(\Magento\Framework\Stdlib\DateTime\DateTimeFactory::class)
            ->create();
        $timezone = $this->objectManager->create(\Magento\Framework\Stdlib\DateTime\TimezoneInterface::class);
        $invoiceCreatedAt = $timezone->formatDateTime(
            $invoiceCreatedAt,
            \IntlDateFormatter::SHORT,
            \IntlDateFormatter::NONE,
            null,
            null,
            'yyyy-MM-dd'
        );
        $invoiceCreatedAtDate = $dateTime->date('Y-m-d', $invoiceCreatedAt);

        $expectedResult = [
            [
                'orders_count' => 1,
                'orders_invoiced' => 1,
                'period' => $invoiceCreatedAtDate
            ],
        ];
        $actualResult = [];
        foreach ($this->collection->getItems() as $reportItem) {
            $actualResult[] = [
                'orders_count' => $reportItem->getData('orders_count'),
                'orders_invoiced' => $reportItem->getData('orders_invoiced'),
                'period' => $reportItem->getData('period')
            ];
        }
        $this->assertEquals($expectedResult, $actualResult);
    }
}