Add unit tests for the blacklist view returning the correct status for blacklisted and non-blacklisted wallets

[Chucks1093]

Summary

A is_blacklisted view should return true for a wallet on the blacklist and false for one that is not. Unit tests should confirm both cases and that removing a wallet from the blacklist flips the response.

Scope

• Test is_blacklisted returns false for a wallet not on the list
• Test is_blacklisted returns true after the wallet is added to the blacklist
• Test is_blacklisted returns false after the wallet is removed from the blacklist

Acceptance Criteria

• Returns false for non-blacklisted wallet
• Returns true after wallet is blacklisted
• Returns false after wallet is removed from blacklist

ETA: 12 hours

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Coordinate on Telegram

[Akinloluwa20]

@Akinloluwa20 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to work on this issue

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[Unclebaffa]

@Unclebaffa has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi! I've carefully reviewed the entire task description and fully understand the requirements and expected outcome.
I have experience working on similar tasks and I'm confident I can complete this within about an hour. I'd be happy to take ownership of this issue and submit a clean, well-tested solution promptly.
If it's available, please assign it to me. Thank you!

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[Izzyabbey2020]

@Izzyabbey2020 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi there, I carefully reviewed the issue details and I’m confident i can deliver a clean and efficient solution.

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[Cmitchelle7]

@Cmitchelle7 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, reviewed the issue in detail. Full stack background with solid experience relevant to this task. No blockers on my end — I'm ready to submit a PR shortly. Please assign.

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[sladeoj]

@sladeoj has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hii maintainer can i work on this issue please

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[josephinejose-alt]

@josephinejose-alt has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

studied the task at hand and i can say i have a clear understanding
pls assign me so i can begin implementation

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