Terraform Test: Add ability to restrict parallelism when creating resources

[richid]

Terraform Version

Terraform v1.6.3
on darwin_arm64

Use Cases

I have been converting some modules from my home-grown E2E testing pattern to using the new terraform test framework. It's been great but one issue I'm running into is that there is no ability to set the -parallelism=<N> flag when using the apply command. This is generally not a problem but there are certain AWS resources that run into problems when this is not set to 1. Specifically, certain AWS ECS resources as outlined hashicorp/terraform-provider-aws#9777

Attempted Solutions

Tried to set the following envvar: TF_CLI_ARGS_apply="-parallelism=1". Confirmed that the -parallelism argument is not supported by the test command.

Proposal

Add a -parallelism=<N> flag to the test command that operates in the same way it does for the apply command.

References

No response

[crw]

Thanks for this feature request! If you are viewing this issue and would like to indicate your interest, please use the 👍 reaction on the issue description to upvote this issue. We also welcome additional use case descriptions. Thanks again!

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