DependsOn ordering in tests

Migrating this issue from the taskcat/taskcat-v9 repo, as it’s now archived.

A need has been identified to serialze test runs via DependsOn. The use-case involves using multiple CFN Stacks to 1) build infra, and 2) run integration tests. Running the integration tests in parallel as the infra is being built does not lead to a desired outcome.

from @jaymccon :

thinking about this, implicit dependencies should be pretty easy to do if we have a new magic parameter, something like $[taskcat_output_MyTestName_MyOutputName] would fetch the MyOutputName output from the stack created by the MyTestName test

[jeffreycoe]

@andrew-glenn Yes, exactly. Also as an example, the AWS Quick Start templates use CloudFormation custom resources to do some configuration with the EKS cluster once it’s online. We’d have to use DependsOn on those custom resources as we’d have to wait for the EKS cluster resource to complete its provisioning process before they can be executed.

Here are some example templates: https://github.com/aws-quickstart/quickstart-amazon-eks/tree/main/templates

[t0ffel]

We use cloudformation to do layered deployments. i.e. separate cfn templates are used to create separate layers. DependsOn along with being able to take output and use it in the dependent test would work great for us.