Fix expected returns for v0.18.0 of the dev server

[jpwilliams]

Summary

Fixes integration tests for v0.18.0 of the dev server, which unwraps output.

Checklist

• [ ] Added a docs PR that references this PR N/A
• [x] Added unit/integration tests
• [ ] Added changesets if applicable N/A

[changeset-bot[bot]]

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Latest commit: 289dd4e48450d47e1b6ff1f7098767f75c7bc549

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