Add test for ActiveSamplingRequest

[ackintosh]

Issue Addressed

I've implemented batching sampling requests in #6256, but there are no unit tests for it yet.

Proposed Changes

Add a test for ActiveSamplingRequest to ensure that the requests are batched, and check the status of the requests.

[michaelsproul]

Please update to point at unstable by either:

1. Rebasing on unstable (if your branch has a small number of commits that are easy to tease out), or
2. Merging origin/das into this PR: git fetch origin; git merge origin/das. This will result in the smallest number of conflict resolutions and is better for branches that already contain merge commits or have extensive history.

[ackintosh]

Thanks for the comment Michael! I've rebased this on unstable.

[ackintosh]

Thanks @dapplion! I've written tests in the tests.rs file.

[jimmygchen]

@mergify queue

[mergify[bot]]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at 8cf686f5c11cbad19727885d07df5abfddeddb0f