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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

1.8.0 - 2025-10-21

Added

  • Full Go Generics Support (fixes #165)
    • Generate tests for generic functions with type parameters (func Foo[T any](val T) T)
    • Support for all constraint types: any, comparable, union types (int64 | float64), approximation constraints (~int)
    • Generate tests for methods on generic types (func (s *Set[T]) Add(v T))
    • Support for multiple type parameters (func Pair[T, U any](first T, second U))
    • Smart type parameter substitution throughout generated tests
    • Intelligent constraint-to-concrete-type mapping:
      • any → int (simple value type)
      • comparable → string (commonly comparable type)
      • Union types → first option (e.g., int64 | float64 → int64)
      • Approximation constraints → underlying type (e.g., ~int → int)
    • Support for generic receiver types with proper type argument instantiation
    • Test names automatically strip type parameters (e.g., Set[T].Add → TestSet_Add)

Changed

  • Improved type constraint analysis in parser
    • Extracts type parameters from both function signatures and type declarations
    • Resolves type parameters for methods on generic types
  • Enhanced template rendering with type substitution helpers
    • TypeArgs - generates concrete type arguments for generic function calls
    • FieldType - substitutes type parameters in field type declarations
    • ReceiverType - substitutes type parameters in receiver instantiations

Technical Details

  • Parser enhancements in internal/goparser/goparser.go:
    • New parseTypeDecls() extracts type parameters from type declarations
    • New parseTypeParams() parses AST field lists for type parameters
    • New extractBaseTypeName() strips type parameters from receiver types
  • Model updates in internal/models/models.go:
    • New TypeParam struct with Name and Constraint fields
    • Added TypeParams field to Function struct
    • New helper methods: IsGeneric(), HasGenericReceiver(), TypeParamMapping()
  • Render improvements in internal/render/:
    • New template functions for type substitution
    • Smart constraint-to-type mapping with support for numeric constraints
    • Proper handling of generic receiver instantiation

Test Coverage

  • 97.5% main package coverage (all tests passing)
  • 83.5% overall project coverage
  • 100% coverage on all new parser functions
  • Comprehensive test suite with 8 generic patterns:
    1. Generic functions with any constraint
    2. Generic functions with comparable constraint
    3. Union type constraints
    4. Multiple type parameters
    5. Mixed generic/non-generic parameters
    6. Generic functions returning errors
    7. Methods on single-parameter generic types (Set[T])
    8. Methods on multi-parameter generic types (Map[K,V])

1.7.0 - 2025-10-20

Added

  • Recursive directory support: You can now use patterns like pkg/... to generate tests for all Go files in a directory tree (fixes #186)
  • Documentation for the -named flag in README (PR #185)
  • CLAUDE.md for AI-assisted development context
  • t.Parallel() at the top-level test function when -parallel flag is used (fixes #188)

Changed

  • BREAKING: Minimum Go version increased from 1.6 to 1.22
    • Leverages Go 1.22's per-iteration loop variable scoping
    • Removes unnecessary tt := tt and name := name shadowing in generated tests
    • Cleaner, more modern generated test code
  • Template Error Handling: Use t.Fatalf() instead of t.Errorf() + return in subtests with return values (PR #184)
    • Better test ergonomics and clearer failure semantics
    • Prevents misleading test output when errors occur
  • Dependencies: Replaced third-party bindata tools with stdlib embed package (PR #181)
    • Removed 834+ lines of generated code
    • Simplified build process (no more go generate needed)
    • Better maintainability and reduced dependencies
  • Installation: Updated README to use go install instead of deprecated go get (PR #180)
  • CI/CD: Updated GitHub Actions workflow
    • Now tests only Go 1.22.x and 1.23.x (down from 8 versions)
    • Updated actions/setup-go v2→v5
    • Updated actions/checkout v2→v4
    • Simplified coverage reporting with coverallsapp/github-action@v2

Fixed

  • Import Path Bug: Fixed missing import paths when receiver types and methods are defined in different files (PR #179)
    • Now correctly collects imports from all files in the package
    • Prevents compilation errors in generated test files
  • t.Parallel() Placement: Moved t.Parallel() to the correct location at the top of test functions
    • Satisfies tparallel linter requirements
    • Ensures proper parallel test execution

Removed

  • Support for Go versions older than 1.22
  • Bindata dependency (go-bindata, esc) in favor of stdlib embed
  • Unnecessary loop variable shadowing in generated tests

1.6.0 - 2020-XX-XX

Previous release (pre-changelog).