(@aws-cdk/assert): Unable to pass test if a resource doesn't exist

❓ General Issue

The Question

I want to write validation tests and make it a library so that every stack can follow best security practices, naming convention, … for my cdk stacks.

I’ve been looking at aws-assert for it and it seems not possible to run test only if a resource exists in the stack.

For example, if I were to write:

import { haveResourceLike,expect } from "@aws-cdk/assert";
import { mystack } from "..."

test('Bucket versioning must be enabled', () => {
        expect(mystack).to(haveResourceLike("AWS::S3::Bucket", {
            VersioningConfiguration: {
                Status: "Enabled"
            }
        }));
})

without any bucket in the stack then that would fail as expected.

The issue https://github.com/aws/aws-cdk/issues/12452 had similar problem as mine and I tried the proposed solution which was

import { haveResourceLike,expect } from "@aws-cdk/assert";
import { mystack } from "..."

test('Bucket versioning must be enabled', () => {
    if (haveResourceLike("AWS::S3::Bucket"))
        expect(mystack).to(haveResourceLike("AWS::S3::Bucket", {
            VersioningConfiguration: {
                Status: "Enabled"
            }
        }));
})

However, the test didn’t pass.

Is there anyway to bypass this limitation?

Environment

• CDK CLI Version: 1.109
• Module Version: 1.109.0
• Node.js Version: v12.18.3
• OS: Windows 10
• Language (Version): TypeScript (4.3.3)

Other information

[peterwoodworth]

Hmm I’m finding the same thing as you. The if statement isn’t working, I’ll research this and get back to you

[github-actions[bot]]

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