Pytest Dagger Toolchain

A toolchain for testing Python application with automatic OpenTelemetry tracing

This toolchain automatically injects a pytest_otel library for test tracing visibility in Dagger TUI and Dagger Cloud. No configuration required.

Usage:

On a python project, using pytest as the test runner:

• initialize a dagger module if not already done: dagger init .
• install the pytest toolchain: dagger install github.com/dagger/pytest
• run tests: dagger check pytest:test. It will:
  • creates a Wolfi based container with uv
  • install your project dependencies using uv sync (a cache volume is set)
  • inject the pytest_otel dependency for automatic test tracing
  • run pytest