test: add overflow test for coin Add

[zoereco]

Description

theres no check for when we add coins that values go above 2**256. PR adds such a test.

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Summary by CodeRabbit

• Tests
  • Enhanced testing for handling large integer calculations to prevent overflow errors.

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Walkthrough

Walkthrough

The recent update introduces enhancements to handle large integer calculations more accurately by incorporating the math/big package. This is particularly aimed at preventing overflow issues by defining a maxUint256 variable to represent the maximum value within 256 bits. Additionally, new test cases are added to verify that addition operations remain within the 256-bit limit, ensuring the system's reliability in processing large numbers.

Changes

File(s)	Summary
types/coin_test.go	Introduced math/big for large integer handling, defined maxUint256, and added test cases for addition overflow checks.

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Review Status

Actionable comments generated: 1

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Commits

Files that changed from the base of the PR and between 1b5c30f and 35e855b.

Files selected for processing (1)

• types/coin_test.go (3 hunks)

[coderabbitai]

📝 NOTE
This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [160-175]

The test case for checking overflow in coin addition does not assert or check for an overflow error directly. Instead, it relies on the shouldPanic flag to determine if an overflow occurred. This approach might not accurately capture overflow scenarios, especially if the Add method is modified to return an error instead of panicking.

- // Current implementation relies on panic for overflow detection
+ // Suggestion: Implement and check for an explicit overflow error from the Add method