Add Unit Test: Withdraw Zero and Withdraw Excess Balance

[greatest0fallt1me]

Description
Add tests for withdraw: (1) withdraw(0) panics or returns without effect per spec; (2) withdraw(amount) when amount > balance panics.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Depends on Issue 25 (withdraw) being implemented

Suggested execution

• Fork the repo and create a branch
• git checkout -b test/withdraw-edge-cases
• Implement changes
  • Test withdraw(0) behavior; test withdraw(balance + 1) panics
• Test and commit
  • Run tests; include test output
• Example commit message: test: withdraw zero and excess balance edge cases

Guidelines

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours
• Project details: #

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[odeyemitobi]

@odeyemitobi has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi goat, i will like to work on this issue

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[Akanimoh12]

@Akanimoh12 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi, I'd love to work on this issue. I'm a full-stack blockchain developer specializing in web apps and Smart Contracts, with experience in Next.js, TypeScript, Tailwind, and blockchain integration's and writing tests. I can handle this confidently, here's my portfolio and key projects:

• https://frontend-nine-mocha.vercel.app/
• https://i-predict.vercel.app/
• https://somnia-screams.vercel.app/
• https://chessflip-celo.vercel.app/

Active OSS contributor.

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[Nexha-dev]

@Nexha-dev has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi Maintainer Can I work on this issue

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[auracule007]

@auracule007 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello, I'm Promise Adedokun. I'm a full-stack developer with 4+ years of experience writing comprehensive unit tests for smart contracts and handling edge cases like zero-value and overflow scenarios. I'd love to add the withdraw edge case tests. I can verify withdraw(0) behaves as specified and confirm that withdraw(amount) panics when amount exceeds balance. I'll maintain 95%+ test coverage and clear documentation. My ETA is within the 96-hour timeframe.

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[Agbasimere]

@Agbasimere has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Can I work on this?

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[GideonBature]

@GideonBature has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Greetings, I will love to work on this issue if assigned. I am a Software Engineer.

Thank you!

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[Adeswalla]

@Adeswalla has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello Maintainter,
I would like to apply to this issue and work on it because as a Javascript and Typescript i prioritize functional and production-level code.

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