Every module should contain an examples folder.
Every examples folder should contain at least one sub folder(the suggested names are startup or complete), it will contain the most commonly seen use case(some variables are mutex, so it could be impossible to use all of them at the same time).
Some other folders containing example code are also welcomed. The name should reflect the use case. For example in AKS module, a folder called aci demonstrated how to create an AKS cluster with aci enabled.
From Terraform AzureRM 3.0, the default value of prevent_deletion_if_contains_resources in provider block is true. This will lead to an unstable test(because the test subscription has some policies applied and they will add some extra resources during the run, which can cause failures during destroy of resource groups).
Please explicitly set prevent_deletion_if_contains_resources to false.
Demo code can have some variables with default value configured or have corresponding terraform.tfvars file created, which enables the user to run terraform apply directly.