$resourceGroupName = "TestResourceGroup"

# Delete resource group, and its resources (HDInsight cluster and storage account)
Write-Host "Deleting $resourceGroupName resource group, and its resources (HDInsight cluster and storage account) ..."
Remove-AzureRmResourceGroup -Name $resourceGroupName -Force

# Could also remove just the cluster with Remove-AzureHDInsightCluster

Write-Host "Finished!"