PSPDFKit-labs/bypass

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1001 stars · 118 forks observed · 2026-10-21

What it is AI-extracted, prompt v1, taxonomy v1, 2026-09-07, confidence 0.97

Bypass is an Elixir library for spinning up a lightweight mock HTTP server (a Plug) inside tests to return prebaked responses to client requests. It supports route-specific expectations, stubs, and toggling the server up/down to simulate downtime.

Use cases

• mock an external HTTP API in Elixir tests
• test how an HTTP client handles error responses like 429
• simulate a server going down and recovering in tests
• stub specific routes with method and path expectations
• run async ExUnit tests against a local test server

When to choose

• you're writing Elixir/ExUnit tests for code that makes HTTP requests
• you need fine-grained control over mock responses and server availability
• you want a lightweight in-process alternative to a full mock server

When to avoid

• you need contract testing or recorded/replayed traffic rather than hand-written stubs
• your project isn't in Elixir or on the Erlang VM
• you need to mock non-HTTP protocols

Facets

library · maturity stable

testing mocking http-server middleware testing web-development developer-tools elixir jvm elixir plug mock-http-server test-server exunit cowboy

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