### 🧪 Add tests for withdraw method

[El-swaggerito]

Overview
Ensure the SDK withdrawal flow works correctly and handles errors properly.

Requirements

• Test valid withdrawal flow
• Test insufficient balance style errors
• Test invalid amount inputs

Acceptance Criteria

• Withdrawal method has reliable test coverage
• Edge cases are included
• Mocked responses are documented

Labels: testing, vault

[uboho-prog]

@uboho-prog has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello maintainer, please assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @uboho-prog to this issue.

[mubking]

@mubking has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

hello, please i would like to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mubking to this issue.