Test encoding of addresses with leading zeros

[Amxx]

Unit tests for #6106 (that we should merge even if we end up rejecting #6106)

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Walkthrough

The test file test/utils/RLP.test.js was updated to expand test coverage for RLP encoding. An import for the product helper was added to enable iterative testing. The encode/decode addresses test now iterates over multiple address variants instead of a single address. A new test was introduced that systematically tests RLP encoding predictions for contract creation addresses by generating pairs of from-addresses and nonce values, encoding them, hashing with keccak256, extracting the last 20 bytes, and verifying the results against the standard address prediction method.

Possibly related PRs

• Add RLP library #5680: Introduced the RLP library that is being tested by the updated test file, so changes to RLP encoding tests directly correspond to testing the encoder behavior from this PR.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Test encoding of addresses with leading zeros' is related to the main change: adding tests for address encoding including cases with leading zeros, though it focuses on one aspect rather than the full scope which also includes a new create-address prediction test.
Description check	✅ Passed	The description 'Unit tests for #6106' is related to the changeset as the PR adds unit tests for address encoding.

✨ Finishing touches

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Actionable comments posted: 2

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📒 Files selected for processing (1)

• test/utils/RLP.test.js (3 hunks)

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test/utils/RLP.test.js (1)

test/helpers/random.js (1)

• generators (3-10)

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🔇 Additional comments (1)

test/utils/RLP.test.js (1)

5-5: LGTM!

The import is correctly structured and necessary for the new test that uses the product helper.