improve(test): Added tests for AlephZero_SpokePool.sol

[Dhruv-Varshney-developer]

This PR continues the effort to address the missing test coverage identified in #822 .

Description

• AlephZeroSpokePool.sol lacked test coverage, which could lead to potential issues. This PR adds comprehensive tests to ensure the functionality behaves as expected and improves overall reliability.

Code Changes Overview

• Added tests in test/evm/hardhat/chain-specific-spokepools/AlephZero_SpokePool.ts, covering initialization.

Hi @mrice32, @nicholaspai, @chrismaree, @pxrl, @Reinis-FRP, and @bmzig,
Your feedback on this PR would be greatly appreciated. Let me know if any improvements are needed.

Learn more about me here.

[nicholaspai]

Nice PR. I think the higher priority spoke pools to get coverage for are those with more bespoke logic, like the WorldChain_SpokePool and Ink_SpokePool which have special _bridgeTokensToHubPool logic as well as the Blast_SpokePool which has special logic to handle USDB.

Do you want to take a crack at that next?

[nicholaspai]

Sorry, one comment https://github.com/across-protocol/contracts/pull/824/files#r1900274577

[Dhruv-Varshney-developer]

Nice PR. I think the higher priority spoke pools to get coverage for are those with more bespoke logic, like the WorldChain_SpokePool and Ink_SpokePool which have special _bridgeTokensToHubPool logic as well as the Blast_SpokePool which has special logic to handle USDB.

Do you want to take a crack at that next?

Thanks for the review @nicholaspai!
Yes, I'll take a look at those next and create a PR as soon as I am done.