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Single leaf merkle proof tests

This series of tests provides reference test vectors for validating correct generation and verification of merkle proofs based on static data.

Test case format

`state.ssz_snappy`

An SSZ-snappy encoded BeaconState object from which other data is generated.

`proof.yaml`

A proof of the leaf value (a merkle root) at generalized-index leaf_index in the given state.

leaf: Bytes32            # string, hex encoded, with 0x prefix
leaf_index: int          # integer, decimal
branch: list of Bytes32  # list, each element is a string, hex encoded, with 0x prefix

Condition

A test-runner can implement the following assertions:

Check that is_valid_merkle_branch confirms leaf at leaf_index to verify against has_tree_root(state) and proof.
If the implementation supports generating merkle proofs, check that the self-generated proof matches the proof provided with the test.

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