py-evm-issue-1466: Added test cases for EIP170

[junning-tong]

What was wrong?

Check issue-1466 for reference

Double checking this is the intended functionality.

EIP170 states that the contract size limit was changed to 2**14 + 2**13 which is 24,576 bytes. The following line implementations the constant for EIP170, but it is off by one.

py-evm/eth/vm/forks/spurious_dragon/constants.py

Line 13 in 0ff7bc0

EIP170_CODE_SIZE_LIMIT = 24577

How was it fixed?

• Change EIP170_CODE_SIZE_LIMIT from 24577 to 24576
• Add test cases

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[pipermerriam]

Before we merge this, I'd like to understand why this wasn't caught using consensus tests because this seems like the type of thing that 1) I would be surprised if it wasn't in the tests and 2) if it isn't in the tests it should be added upstream

[junning-tong]

@pipermerriam the newly added test file is in directory tests/core/vm/.
Should I move it to tests/core/consensus/?

[pipermerriam]

No, I'm referring to these tests: https://github.com/ethereum/tests/

They exist as a submodule in the repository.

[junning-tong]

Hi @pipermerriam I see a commit which added test cases in fixtures submodules. https://github.com/ethereum/py-evm/pull/1998/files

Should I move newly added .json to the submodule as well?
tests/core/vm/fixtures/spurious_dragon_computation_test_code_size_limitation.json