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title: Testing and Debugging Custom Policies
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---
product: Omni Gateway Policy Development Kit (PDK)
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# Testing and Debugging Custom Policies

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

Use the Policy Development Kit (PDK) testing options to validate behavior, catch regressions, and
debug before you [publish your policy to Exchange](https://docs.mulesoft.com/pdk/latest/policies-pdk-publish-policies-overview):

- [Debugging Custom Policies with the PDK Debugging Playground](https://docs.mulesoft.com/pdk/latest/policies-pdk-debug-local) — Use the
  preconfigured API instance in your project’s `playground` directory to exercise and debug the
  policy interactively.

- [Writing Unit Tests](https://docs.mulesoft.com/pdk/latest/policies-pdk-unit): Run fast, deterministic Rust unit tests that exercise the
  full request and response lifecycle without configuring Envoy, WebAssembly, or external services.

- [Writing Integration Tests](https://docs.mulesoft.com/pdk/latest/policies-pdk-integration-tests): Run automated tests on a local mode
  Omni Gateway to verify your policy with real gateway behavior and surrounding configuration.