Sweep: Update LocalPersistenceServiceTest

[olvrwn]

In LocalPersistenceServiceTest.swift, create unit tests to test the LocalPersistenceServiceTest

Checklist

- [X] `CashBudTests/Tests/Services/LocalPersistenceServiceTest.swift` ❌ Failed

• Add test cases to test the LocalPersistenceService. • Use XCTAssert and related functions to verify the expected results.

[sweep-ai[bot]]

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File Path	Proposed Changes
CashBudTests/Tests/Services/LocalPersistenceServiceTest.swift	Modify CashBudTests/Tests/Services/LocalPersistenceServiceTest.swift with contents: • Add test cases to test the LocalPersistenceService. • Use XCTAssert and related functions to verify the expected results.

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