cli/.core/task/issue/258/plan.md

Implementation Plan: Issue 258

Phase 1: Command Structure

1. Create cmd/core/cmd/test.go
2. Register test command with Cobra
3. Add flags: --all, --filter, --coverage

Phase 2: Change Detection

1. Run git diff --name-only HEAD to get changed files
2. Filter for .go files (exclude _test.go)
3. Map each file to its test file:
   • internal/foo/bar.go → internal/foo/bar_test.go
   • Skip if test file does not exist

Phase 3: Test Execution

1. Build go test command with detected test files
2. Pass through --coverage flag as -cover
3. Pass through --filter as -run pattern
4. Stream output to terminal

Phase 4: Edge Cases

• No changed files → inform user, optionally run all
• No matching test files → inform user
• --all flag → skip detection, run go test ./...

Files to Create/Modify

• cmd/core/cmd/test.go (new)
• cmd/core/cmd/root.go (register command)

Testing

• Add cmd/core/cmd/test_test.go with unit tests
• Manual testing with actual git changes