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feat: Add support for Go 1.24 testing.T methods
Co-authored-by: cursor.nop <cursor.nop@jimeh.info>
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GO_VERSION_SUPPORT_PLAN.md
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GO_VERSION_SUPPORT_PLAN.md
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# Go Version Support Plan for go-mocktesting
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## Research Summary
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### Current State
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- **Base Go Version**: 1.15 (from go.mod)
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- **Currently Supported**: Go 1.15, 1.16 (with Setenv method)
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- **Latest Go Version**: 1.24
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- **Missing Methods**: Context(), Chdir()
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### Complete testing.T Method Inventory
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All public methods on *testing.T as of Go 1.24:
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- Chdir ❌ (Go 1.24) - **MISSING**
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- Cleanup ✅
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- Context ❌ (Go 1.24) - **MISSING**
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- Deadline ✅
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- Error ✅
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- Errorf ✅
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- Fail ✅
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- FailNow ✅
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- Failed ✅
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- Fatal ✅
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- Fatalf ✅
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- Helper ✅
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- Log ✅
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- Logf ✅
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- Name ✅
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- Parallel ✅
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- Run ✅
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- Setenv ✅ (Go 1.16+)
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- Skip ✅
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- SkipNow ✅
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- Skipf ✅
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- Skipped ✅
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- TempDir ✅
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## Version-by-Version Analysis
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### Go 1.15 (Base)
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**File**: `t.go`
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**Status**: ✅ Fully implemented
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Methods implemented:
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- Core test methods (Fail, FailNow, Failed, Error, Errorf, Fatal, Fatalf)
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- Logging (Log, Logf)
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- Skipping (Skip, Skipf, SkipNow, Skipped)
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- Helpers (Helper)
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- Test organization (Name, Parallel, Run, Deadline)
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- Cleanup (Cleanup)
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- Temporary directories (TempDir)
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### Go 1.16
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**File**: `t_go116.go` (with build tag `//go:build go1.16`)
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**Status**: ✅ Fully implemented
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New methods:
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- `Setenv(key, value string)` - Set environment variable for test
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### Go 1.17
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**Status**: ✅ No new testing.T methods
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### Go 1.18
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**Status**: ✅ No new testing.T methods
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### Go 1.19
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**Status**: ✅ No new testing.T methods
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### Go 1.20
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**Status**: ✅ No new testing.T methods
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### Go 1.21
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**Status**: ✅ No new testing.T methods
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### Go 1.22
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**Status**: ✅ No new testing.T methods
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### Go 1.23
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**Status**: ✅ No new testing.T methods
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### Go 1.24
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**File**: `t_go124.go` (needs to be created)
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**Status**: ❌ Not implemented
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New methods:
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1. **Context() context.Context**
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- Returns a context.Context that is canceled just before
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Cleanup-registered functions are called
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- Allows cleanup functions to wait for resources that shut down
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on Context.Done before the test completes
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2. **Chdir(dir string)**
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- Calls os.Chdir(dir) and uses Cleanup to restore the current
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working directory after the test
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- On Unix, also sets PWD environment variable for the duration
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- Cannot be used in parallel tests (affects whole process)
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## Implementation Plan
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### Phase 1: Add Go 1.24 Support ⏳
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#### Step 1.1: Create `t_go124.go`
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- Add build constraint: `//go:build go1.24`
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- Implement `Context() context.Context` method
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- Store context in T struct (add ctx field)
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- Create context on T initialization
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- Cancel context before cleanup functions run
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- Return the context
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- Implement `Chdir(dir string)` method
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- Call os.Chdir(dir)
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- Register cleanup to restore original directory
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- Store original PWD and restore it
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- Track current directory changes
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#### Step 1.2: Update T struct in `t.go`
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- Add `ctx context.Context` field
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- Add `ctxCancel context.CancelFunc` field
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- Add `origDir string` field for Chdir tracking
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- Initialize context in NewT()
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#### Step 1.3: Create `t_go124_test.go`
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- Add build constraint: `//go:build go1.16`
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- Test Context() method:
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- Verify context is not nil
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- Verify context is canceled during cleanup
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- Test that cleanup can use Context.Done
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- Test Chdir() method:
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- Verify directory changes work
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- Verify directory is restored after test
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- Verify PWD environment variable handling
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- Verify panic/error on parallel tests
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#### Step 1.4: Update TestT_methods test
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- Ensure it runs on all Go versions
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- Verify no failures for Go 1.24+
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### Phase 2: Update CI Configuration ⏳
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#### Step 2.1: Update `.github/workflows/ci.yml`
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Current test matrix:
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```yaml
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go_version:
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- "1.15"
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- "1.16"
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- "1.17"
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```
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Add newer versions:
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```yaml
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go_version:
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- "1.15"
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- "1.16"
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- "1.17"
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- "1.18"
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- "1.19"
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- "1.20"
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- "1.21"
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- "1.22"
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- "1.23"
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- "1.24"
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```
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#### Step 2.2: Update other CI jobs
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- Update `lint` job to use Go 1.24
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- Update `tidy` job to use Go 1.24
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- Update `cov` job to use Go 1.24
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### Phase 3: Documentation Updates ⏳
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#### Step 3.1: Update README.md
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- Note Go 1.24 support
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- Document new Context() and Chdir() methods
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- Add examples if appropriate
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#### Step 3.2: Update CHANGELOG.md
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Add new version entry:
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```markdown
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## [Next Release]
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### Features
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* **testing:** Add support for Go 1.24 Context() and Chdir() methods
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* **ci:** Test against Go 1.18-1.24
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```
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#### Step 3.3: Update go.mod
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Consider whether to bump minimum version or keep at 1.15
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### Phase 4: Testing & Validation ⏳
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#### Step 4.1: Run TestT_methods
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```bash
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go test -v -run TestT_methods
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```
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Should pass with no failures.
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#### Step 4.2: Run full test suite on all versions
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```bash
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for v in 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24; do
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go$v test -v -race ./...
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done
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```
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#### Step 4.3: Verify coverage
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```bash
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make cov
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```
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Ensure new methods are covered.
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## Implementation Details for Go 1.24 Methods
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### Context() Implementation
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```go
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//go:build go1.24
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// +build go1.24
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package mocktesting
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import "context"
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// Context returns a context that is canceled just before Cleanup-registered
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// functions are called.
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func (t *T) Context() context.Context {
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t.mux.RLock()
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defer t.mux.RUnlock()
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return t.ctx
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}
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```
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Required struct changes:
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```go
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type T struct {
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// ... existing fields ...
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ctx context.Context
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ctxCancel context.CancelFunc
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}
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```
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Initialize in NewT():
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```go
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func NewT(name string, options ...Option) *T {
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ctx, cancel := context.WithCancel(context.Background())
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t := &T{
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// ... existing fields ...
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ctx: ctx,
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ctxCancel: cancel,
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}
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// ... rest of init ...
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}
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```
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### Chdir() Implementation
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```go
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//go:build go1.24
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// +build go1.24
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package mocktesting
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import (
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"os"
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)
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// Chdir calls os.Chdir(dir) and uses Cleanup to restore the current
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// working directory to its original value after the test.
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func (t *T) Chdir(dir string) {
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t.mux.Lock()
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defer t.mux.Unlock()
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// Store original directory on first call
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if t.origDir == "" {
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origDir, err := os.Getwd()
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if err != nil {
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t.internalError(err)
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return
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}
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t.origDir = origDir
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// Register cleanup to restore directory
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t.Cleanup(func() {
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os.Chdir(t.origDir)
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})
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}
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// Change directory
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if err := os.Chdir(dir); err != nil {
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t.internalError(err)
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}
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}
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```
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Required struct changes:
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```go
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type T struct {
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// ... existing fields ...
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origDir string
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}
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```
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## Key Design Decisions
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### Build Tags
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Use `//go:build go1.24` syntax (not older `// +build` only) for
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consistency with modern Go.
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### Context Lifecycle
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- Context is created at T initialization
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- Context is NOT canceled during test execution
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- Context IS canceled before Cleanup functions run
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- This allows cleanup functions to wait on Context.Done
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### Chdir Behavior
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- First call to Chdir stores original directory
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- Cleanup is registered once to restore directory
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- Subsequent calls change directory but don't add more cleanups
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- Errors in Chdir call internalError (consistent with TempDir)
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### Backward Compatibility
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- Keep base version at Go 1.15 in go.mod
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- Use build tags to conditionally compile version-specific methods
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- All existing code continues to work on Go 1.15+
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- New methods only available when compiled with Go 1.24+
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## Testing Strategy
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### Unit Tests
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Each new method needs comprehensive unit tests:
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- Context():
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- Returns non-nil context
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- Context is canceled before cleanup
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- Can be used in cleanup functions
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- Works with subtests
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- Chdir():
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- Directory changes work
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- Directory is restored
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- Multiple calls work correctly
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- Error handling
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### Integration Tests
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- Verify TestT_methods passes (the reflective test)
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- Test interaction with existing methods
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- Test with subtests (Run())
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- Test error conditions
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### CI Testing
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- Test on all Go versions 1.15-1.24
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- Test on multiple OS (Linux, macOS, Windows)
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- Run with race detector
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- Verify coverage
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## Timeline Estimate
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- Phase 1 (Implementation): 2-3 hours
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- Phase 2 (CI Updates): 30 minutes
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- Phase 3 (Documentation): 30 minutes
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- Phase 4 (Testing): 1 hour
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- **Total**: ~4-5 hours
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## Risk Assessment
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### Low Risk
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- Go 1.17-1.23 have no new methods (already compatible)
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- Implementation pattern established with Go 1.16 (Setenv)
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- Good test coverage with TestT_methods
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### Medium Risk
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- Context lifecycle management needs careful implementation
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- Chdir affects process state (need proper cleanup)
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- CI configuration changes need validation
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### Mitigation
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- Follow established patterns from Setenv implementation
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- Write comprehensive tests before implementation
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- Test on multiple Go versions locally before CI
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- Use build tags to isolate version-specific code
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## Success Criteria
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1. ✅ TestT_methods passes on Go 1.24
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2. ✅ All existing tests pass on Go 1.15-1.24
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3. ✅ New methods have >90% test coverage
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4. ✅ CI tests pass on all versions
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5. ✅ Documentation is updated
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6. ✅ No breaking changes to existing API
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## Notes
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- The test failure currently shows: "Chdir" and "Context" are not
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implemented
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- These are the ONLY two methods missing
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- Go 1.17-1.23 are already fully supported (no new methods)
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- Implementation should be straightforward following existing patterns
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