MC-37306: Sitemap generated by cron have wrong image URL (cache path)

Author: Roman Lytvynenko

app/code/Magento/Sitemap/Test/Unit/Model/ObserverTest.php

@@ -166,6 +166,9 @@ public function testCronGenerateSitemapEnvironmentEmulation()
             ->method('getStoreId')
             ->willReturn($storeId);
 
+        $this->sitemapMock->expects($this->once())
+            ->method('generateXml');
+
         $this->appEmulationMock->expects($this->once())
             ->method('startEnvironmentEmulation');