terraform test

terraform test: Providers, modules, resources, and data sources can now be mocked during executions of terraform test. The following new blocks have been introduced within .tftest.hcl files:
- mock_provider: Can replace provider instances with mocked providers, allowing tests to execute in command = apply mode without requiring a configured cloud provider account and credentials. Terraform will create fake resources for mocked providers and maintain them in state for the lifecycle of the given test file.
- override_resource: Specific resources can be overridden so Terraform will create a fake resource with custom values instead of creating infrastructure for the overridden resource.
- override_data: Specific data sources can be overridden so data can be imported into tests without requiring real infrastructure to be created externally first.
- override_module: Specific modules can be overridden in their entirety to give greater control over the returned outputs without requiring in-depth knowledge of the module itself.

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