[http-specs] Add http-specs tests for CSV encoding on model properties

[Copilot]

Adds scenario tests for array encoding on model properties, covering all four ArrayEncoding variants.

Changes

• New test folder: packages/http-specs/specs/encode/array/
• Scenarios added:
  • commaDelimited (CSV) - values joined with ,
  • spaceDelimited (SSV) - values joined with
  • pipeDelimited - values joined with |
  • newlineDelimited - values joined with \n

Example

model CommaDelimitedArrayProperty {
  @encode(ArrayEncoding.commaDelimited)
  value: string[];
}

@route("/property/comma-delimited")
@post
op commaDelimited(@body body: CommaDelimitedArrayProperty): CommaDelimitedArrayProperty;

Expected request/response body:

{
  "value": "blue,red,green"
}

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>CSV encoding for model properties Scenario tests</issue_title>
<issue_description>Add http-specs tests for array encoding, including all four encode. Add a new folder under packages/http-specs/specs/encode.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes CSV encoding for model properties Scenario tests #9029

---

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commit: f6d8c0a

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-specs

Show changes

@typespec/http-specs - feature ✏️

Add tests for array encode.

[tadelesh]

@timotheeguerin @markcowl Could either of you approve this?