tests(math): document unexpected behavior in nil values

[kocubinski]

Description

Opens: #21808

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Summary by CodeRabbit

• Tests
  • Introduced a new test to verify the behavior of zero and empty decimal representations, ensuring consistent marshaling and unmarshaling processes.

[coderabbitai]

Walkthrough

Walkthrough

The changes introduce a new test function, Test_DocumentLegacyAsymmetry, in the math/dec_test.go file. This function evaluates the behavior of zero and empty decimal representations, focusing on their string and marshaled byte representations. The test confirms that while the string representations differ, their marshaled forms are identical. It also examines the round-trip marshaling and unmarshaling process, revealing a potential bug in the handling of empty decimals.

Changes

File	Change Summary
math/dec_test.go	Added func Test_DocumentLegacyAsymmetry(t *testing.T) to test the behavior of zero and empty decimal representations, including their string and marshaled byte comparisons.

Sequence Diagram(s)

sequenceDiagram
    participant Test as Test Function
    participant ZeroDec as Zero Decimal
    participant EmptyDec as Empty Decimal
    participant Marshal as Marshal Process
    participant Unmarshal as Unmarshal Process

    Test->>ZeroDec: Check string representation
    ZeroDec-->>Test: Returns "0"
    
    Test->>EmptyDec: Check string representation
    EmptyDec-->>Test: Returns ""
    
    Test->>Marshal: Marshal ZeroDec
    Marshal-->>Test: Returns marshaled bytes for ZeroDec
    
    Test->>Marshal: Marshal EmptyDec
    Marshal-->>Test: Returns marshaled bytes for EmptyDec
    
    Test->>Unmarshal: Unmarshal ZeroDec
    Unmarshal-->>Test: Returns equivalent ZeroDec
    
    Test->>Unmarshal: Unmarshal EmptyDec
    Unmarshal-->>Test: Returns non-equivalent EmptyDec

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Recent review details

Configuration used: .coderabbit.yml
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 01212de and fc3b44f.

Files selected for processing (1)

• math/dec_test.go (1 hunks)

Additional context used

Path-based instructions (1)

math/dec_test.go (2)

Pattern **/*.go: Review the Golang code for conformity with the Uber Golang style guide, highlighting any deviations.

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Pattern **/*_test.go: "Assess the unit test code assessing sufficient code coverage for the changes associated in the pull request"

Additional comments not posted (1)

math/dec_test.go (1)

1029-1060: Excellent test for documenting the asymmetry between zero and empty decimal values!

This test effectively demonstrates the difference in behavior between zero and empty decimal values, particularly in the context of marshaling and unmarshaling. It highlights a potential bug where unmarshaling an empty decimal does not yield an equivalent empty decimal, unlike the case with zero decimals.

This documentation is crucial for understanding the nuances of handling these decimal types and preventing unexpected issues in the codebase.

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[julienrbrt]

ACK for documenting it.