test: karst coverage#561
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Pull request overview
This PR extends the in-process Rust test framework to support running nodes with the Karst fork active at genesis, and adds fork-focused integration tests to validate Karst behavior (basic block building and RIP-7212/EIP-7951 P256VERIFY behavior, including gas repricing).
Changes:
- Add
karst_chain_spec()andkarst_node_config()to easily spin upLocalInstanceunder Karst-at-genesis. - Add a Karst-at-genesis smoke test ensuring ordinary block building still works.
- Add Karst P256VERIFY precompile correctness + gas repricing tests.
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| File | Description |
|---|---|
| crates/op-rbuilder/src/tests/framework/instance.rs | Adds a Karst-at-genesis chain spec helper and exposes karst_node_config() for #[rb_test(config = ...)]. |
| crates/op-rbuilder/src/tests/forks.rs | Adds Karst fork tests (block building, P256VERIFY correctness, and gas repricing comparison vs default chain). |
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avalonche
approved these changes
Jul 21, 2026
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It'll be good to update builder-playground too
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Adds
karst_node_config()to in-process test frameworkSome tests covering: