Set up testing mechanism

[serdardalgic]

Testing GH Action workflow https://github.com/EnterpriseDB/terraform-provider-biganimal/blob/main/.github/workflows/test.yml is disabled for now. We need to enable it.

Moreover, we need to provide more details on how we test, what we test. Currently, we have a vague description of testing here:

Your change should include unit tests and regression tests to protect your feature or other features from breaking. Please make sure

* that tests follow the conventions of existing ones;
* for new features, to cover as many inputs/configurations as possible.

Related reading: https://developer.hashicorp.com/terraform/plugin/sdkv2/testing

[serdardalgic]

As of the end of July 2023, we have the following Acceptance Tests

• The data-sources:
  • data_source_pgd_test.go
  • data_source_region_test.go
• Resources
  • resource_aws_connection_test.go
  • resource_cluster_test.go
  • resource_pgd_test.go
  • resource_project_test.go
  • resource_region_test.go
• and the provider_test.go

Those are very basic tests, and they don't cover updating all the fields. But it's a good start for now.

The next steps would be:

• Improving the tests to cover certain cases, for example: updating a cluster field and ensuring the update is applied, or covering the cases where the cluster should not be updated e.g. changing the
• Improving the tests to cover the creation of the resources on different CSPs and different hosting opportunities(BYOA v.s. BAH).
• How to run the acceptance tests regularly (an internal discussion within EDB would be necessary for that)
• Integrating acceptance tests to the release process (running them for every release)

After creating tickets for the necessary items, I'd like to close this ticket.