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Are you talking about unit tests in something like Mocha or Jest? If you call setMocks() during beforeEach(), or anywhere that's run before each it(), then you achieve that.

Not the mock part. I have codes for the transforms which touch the runtime, it set stuff in the runtime for next test suit. Just wonder if there is a way to ‘reset’ or clean the runtime to default.

Ah yes. I have (very, very old....) tests for transforms, I'll see if I do that...

Example test.ts

My solution was to create a runtime for each it(), describe() or context() that requires it. Here's a simple example.

`runInPulumiStack()` being the magic at work here.