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`pulumi preview` doesn't seem to have any problem with this when i instantiate BucketPolicy — it's just the test that seems to have trouble resolving the output

Interesting.  At first, I thought this was due to <https://github.com/pulumi/pulumi/pull/2638#issuecomment-483809925> (I'm sure in some form or another it still is).  But looking at the actual code, I would have expected this case to work, since you are reading a property that you set in the constructor.

Do you see the same if you use `aws.s3.BucketPolicy` instead of creating a subclass of it?

yes, still hangs if i change the test to:

```
    describe("constructor", function() {
        let testBucket = new aws.s3.Bucket("test");
        let bucketPolicy = new aws.s3.BucketPolicy("test", {
            bucket: testBucket.id,
            policy: ""
        });
        it("should attach to the given bucket", function(done) {
            bucketPolicy.bucket.apply(bucketId =&gt; {
                if (bucketId == "test") {
                    done();
                } else {
                    done(new Error(`wrong bucket id ${bucketId}`))
                }
            })
        });
```

Thanks - we'll have to look deeper - opened <https://github.com/pulumi/pulumi/issues/2785>.

Luke can you recommend a workaround for this?  I'm not sure how to test this part of my code.