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In what context? I use Mocha for all my unit testing and don't have much code like that...

The pattern in our mocha specs is:
1. Import chai-as-promised.
2. Add `promise()` to `Output`.
3. Write all expects thus: `return expect(myOutput.promise()).to.eventually.include(expectedValue)`

For any assertions on an output / promise, note that the callback passed to `it()` needs to be `async`, and the result of the `expect()` needs to be returned from it.

The code for adding `promise()` to `Output` is:
```declare module '@pulumi/pulumi' {
  export interface OutputInstance&lt;T&gt; {
    promise(withUnknowns?: boolean): Promise&lt;T&gt;;
  }
}```

<@U012UJTT55M> I eventually found it. The problem was in my mocks setup, rather than in the verification part with the callback.

<@U012UJTT55M> do you have a public code example somewhere of the pattern (1-2-3) you described above?