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If it’s aws resources, you can run LocalStack and point your local service endpoints to the localhost endpoints and create fake resources. Here’s an example of the approach: <https://www.pulumi.com/blog/pulumi-and-localstack/>

Note that I haven’t personally tested (or even fully read) that post, but I have used Pulumi with LocalStack before and it’s worked reasonably well

Or you can leverage mocks in a pure unit testing setup:
<https://www.pulumi.com/docs/guides/testing/unit/>

Or just make resources with something like <https://www.pulumi.com/registry/packages/random/api-docs/|Random> which doesn't create anything that costs

That random package might be quite useful indeed