(assertions): Add Template.resourcePropertiesCountIs() method

[ddneilson]

Describe the feature

I am requesting creation of a Template.resourcePropertiesCountIs() method to compliment Template.resourceCountIs() in the same way that Template.hasResourceProperties() complements Template.hasResource().

This is a function that asserts that the number of resources in the Template of a given type and that match specified resource properties is equal to a given count.

Use Case

I recently migrated the AWS RFDK from CDKv1 to CDKv2. Many of our tests involve counting the number of Resources with a specific set of properties, but the new testing module for the CDK does not cover the use-case.
I ended up creating a helper in the RFDK to help with our migration, but I think that the functionality would be more useful to the general community.

Proposed Solution

I have a PR prepped and will be posting it momentarily.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.38.1

Environment details (OS name and version, etc.)

All

[peterwoodworth]

Thanks for the PR submission, someone from the team should be able to take a look at this soon 🙂

[github-actions]

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