Files
OmniRoute/tests/unit
Diego Rodrigues de Sa e Souza d215079f66 fix(translator): inject placeholder message when Responses API input[] is empty (#4393)
A client (e.g. Fabric-AI) calling POST /v1/responses with `input: []`
used to be translated into `messages: []`, which every upstream Chat-
Completions provider rejects with `400: at least one message is required`
(surfaced to the client as a confusing 406).

Mirror the existing empty-string handling: when input[] is empty, inject
a single placeholder user message so the request is always valid. Touches
`openaiResponsesToOpenAIRequest` only (the same translator that already
covers the empty-string case at the top of the function), preserves any
caller-supplied `instructions` as a system message, and leaves every
non-empty input path byte-identical.

Adds a TDD test reproducing the empty input[] case (RED before fix, GREEN
after) and updates one pre-existing test that enshrined the broken
behavior (`assert.deepEqual(call.body.messages, [])`) to assert the new
correct shape.


Inspired-by: https://github.com/decolua/9router/pull/419

Co-authored-by: anuragg-saxenaa <anuragg.saxenaa@gmail.com>
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