Replace magic strings with constants in hash_test.go for better maintainability

[Copilot]

Problem

The TestUnitCalculateSHA256 function in internal/helpers/hash_test.go was using hardcoded string literals "same" and "different" as file content in multiple places. This created a maintainability issue where:

• Changes to these values would require updating multiple locations
• The intent of the test values wasn't clearly expressed
• Risk of inconsistencies if values were changed in one place but not others

Solution

Replaced magic strings with named constants defined at the function level:

const (
    sameContent      = "same"
    differentContent = "different"
)

Changes made:

• Added constants block at the beginning of TestUnitCalculateSHA256 function
• Replaced 3 occurrences of magic strings:
  • []byte("same") → []byte(sameContent) (2 locations)
  • []byte("different") → []byte(differentContent) (1 location)

Benefits

• Improved maintainability: Content values can now be changed in one location
• Better readability: Clear intent of what each constant represents
• Reduced error risk: No chance of updating values inconsistently
• Follows Go best practices: Named constants over magic strings

Testing

• ✅ All unit tests pass (including the modified TestUnitCalculateSHA256)
• ✅ Linter reports 0 issues
• ✅ No functional changes to test behavior
• ✅ All helper package tests continue to pass

This is a small but important improvement that enhances code quality and follows established best practices for test maintainability.

Fixes #826.

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[Copilot]

Pull Request Overview

This PR improves the maintainability of the test function by replacing hardcoded string literals with named constants.

• Replaced magic strings in TestUnitCalculateSHA256 with constants.
• Defined two constants (sameContent and differentContent) at the beginning of the test function.
• Updated the changelog to reflect the improved test structure.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/helpers/hash_test.go	Replaced magic strings with constants to improve clarity and maintainability.
.changes/unreleased/improved_test_structure.yaml	Documented the improvement in test structure by replacing magic strings.