# \#testing

**URL:** https://collective.flashbots.net/tag/testing/7.md

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## [Builder-playground: Simplifying Local Testing Environments for Block Building](https://collective.flashbots.net/t/builder-playground-simplifying-local-testing-environments-for-block-building/4863)

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**Author:** [@ferranbt](https://collective.flashbots.net/u/ferranbt)\
**Replies:** 0\
**Last updated:** [April 7, 2025, 4:23pm UTC](https://collective.flashbots.net/t/builder-playground-simplifying-local-testing-environments-for-block-building/4863 "2025-04-07T16:23:47Z")

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We’re excited to announce Builder Playground, an open-source framework to quickly spin up comprehensive block-building test environments for L1 and L2. After wrestling with tools that were either too slow, too inflexi…