private function getMockAssetSources($indexBy, $count)
{
$keyPrefix = $indexBy == 'id' ? '' : 'assetSourceHandle';
$mockAssetSources = [];
for ($x = 0; $x <= $count; ++$x) {
$mockAssetSource = $this->getMockBuilder(AssetSourceModel::class)->disableOriginalConstructor()->getMock();
$mockAssetSource->expects($this->any())->method('__get')->willReturnMap([['handle', 'assetSourceHandle' . $x], ['id', $x], ['name', 'assetSourceName' . $x]]);
$mockAssetSources[$keyPrefix . $x] = $mockAssetSource;
}
return $mockAssetSources;
}