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Stub HTTP responses for Elixir code that uses Req, with no network, no fake server process and no mocking library

sha256:1a5be8dc134928a8238887f9504e70f60f67fb5fa956fd3fc577d86784ecfa1d

ケース

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Stub HTTP responses for Elixir code that uses Req, with no network, no fake server process and no mocking library HOW

パッケージ

req 0.7.2 plug 1.20.3 jason 1.4.5

環境

elixir 1

作成日

2026-08-14T20:15:02Z

コントラクト

• assert the response content-type is what decodes the body, so a stub built with Req.Test.json hands the caller a map and no .json() accessor is called anywhere, and that headers are a map of lists where a missing header reads as nil
• assert the same JSON bytes sent with Plug.Conn.send_resp and no content-type stay a binary, so a clean HTTP 200 stops matching the caller's %{"celsius" => _} clause
• assert that with no content-type the request URL path decides instead: /data.json is decoded while /data and /data.txt are not, because decode_body falls back to application/octet-stream and resolves that through MIME.from_path
• assert an HTTP 500 is {:ok, response} and raises from neither Req.request/1 nor Req.request!/1, that the error body is decoded like any other body, and that http_errors: :raise reports the body still undecoded because handle_http_errors runs ahead of decode_body
• assert retry is on by default: one 500 on GET calls the stub four times (the initial request plus max_retries 3), the same 500 on POST calls it once because :safe_transient covers GET and HEAD only, and retry: :transient opts POST in
• assert Req.Test.transport_error produces {:error, %Req.TransportError{}} rather than a response, which a queue of canned responses cannot express, and that Req.get! raises it
• assert expectations are consumed in order ahead of a stub whatever the registration order, and that once drained Req.Test falls through to the stub instead of failing
• assert an exhausted expectation with no stub raises "no mock or stub for X" while a name never registered raises the different "cannot find mock/stub X in process #PID<...>"
• assert an unmet expectation fails nothing until Req.Test.verify! is called, and that verify! then names how many more uses were expected
• assert JSON decoding is switched off by decode_body: false, decoders: false or raw: true, that :decoders replaces the default [:json, :json_api] rather than extending it, and that a codec under :decoders is the 0.7.0 replacement for the deprecated :decode_json
• assert Req.Test implements the Plug behaviour and the stub name is literally that plug's options, so a bare function plug stubs HTTP with no registry at all

ファイル

• csx.json
• lib/csx_req/weather.ex
• mix.exs
• mix.lock
• test/contract_test.exs
• test/test_helper.exs

検証済みアーティファクトをダウンロード (tar.gz) — 契約が実行された正確なバイト列

オリジンシーダー

anonymous

検証レシート

• elixir 1 · CONTAINER_RUN · compile:PASS · contract:PASS · load:PASS · resolve:PASS · hex@1 · 2026-08-14 · ed25519:a2ec939a4c60e243