Test framework research effort

What type of testing should we focus on?

### Types of tests:
1. **Static analysis** - test code without deploying it
- compiler
- linter: will be covered by Issue #428
- dry run: can be accomplished via [what-if](https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/template-deploy-what-if)

2. **Unit tests** - test a single unit of code in isolation
- test single module in isolation from Azure

**Note:** what value is this when infra code is all about talking to Azure?

1. **Integration tests** - deploy real infrastructure and run validations
- test single, deployed, module
- examples: check outputs against expected values. Verify HTTP request returns 200.

4. **End to end tests** - test entire infra works together
- test all modules deployed together

**Note:** Can be slow and flaky, would need to be incremental somehow (dedicated environment). Can get expensive to deploy all resources.