> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 1.59.0 **`(feat):`** Generate wire tests for endpoints that return a file download (`io.Reader`). The generated test calls the raw client, asserts the served `Content-Type`, reads the stream to completion and compares the bytes against the fixture. The WireMock mapping for these endpoints now serves a real binary payload (a small valid PDF via `base64Body`, `application/octet-stream`) instead of the JSON string `""` with `Content-Type: application/json`. This also applies to OpenAPI-imported endpoints whose only autogenerated examples are error responses (e.g. Plaid's `/asset_report/pdf/get`).