# bf-224fc: Add basic test function skeleton to forms_integration.rs

## Status: COMPLETE

## Summary

The file `crates/pdftract-cli/tests/forms_integration.rs` already contains multiple test functions that meet all acceptance criteria. The test skeleton provides a complete foundation for forms integration testing.

## Acceptance Criteria Verification

### ✅ File contains at least one `#[test]` function
The file contains 6 test functions:
1. `test_discover_pdf_fixtures` (line 90) - Tests PDF fixture discovery and prints discovered files
2. `test_forms_fixtures_discovery` (line 115) - Tests CLI invocation on form fixtures
3. `test_extract_all_discovered_pdfs` (line 168) - Tests pdftract extract on all discovered PDFs
4. `test_form_field_structure` (line 264) - Placeholder for form field structure validation
5. `test_acroform_features` (line 288) - Placeholder for AcroForm-specific features
6. `test_xfa_detection` (line 311) - Placeholder for XFA form detection

### ✅ Test function compiles without syntax errors
Verified with `cargo test --package pdftract-cli --test forms_integration --no-run` - compilation succeeds with no errors.

### ✅ Test function does something non-empty
All test functions contain non-empty operations:
- Assertions (e.g., `assert!(bin.exists(), ...)`)
- Logic for discovering fixtures via walkdir
- CLI invocation with stdout/stderr capture
- Print statements for debugging and progress tracking
- Early returns with explanatory messages when no fixtures exist

## Test Infrastructure

The test file includes comprehensive helper functions:
- `pdftract_bin()` - Locates the pdftract binary (debug or release)
- `fixtures_dir()` - Returns path to forms fixtures directory
- `find_pdf_fixtures()` - Non-recursive PDF discovery in fixtures directory
- `discover_pdf_fixtures()` - Recursive PDF discovery via walkdir

## Test Categories

### Active Tests (fully functional)
- Discovery tests that find and list PDF fixtures
- Integration tests that run pdftract CLI commands
- Tests that capture and display CLI output (stdout/stderr)

### Placeholder Tests (skeleton for future implementation)
- Form field structure validation (TODO comments)
- AcroForm-specific features (TODO comments)
- XFA form detection (TODO comments)

## Test Hygiene Considerations

The tests implement good practices:
- Graceful handling when no fixtures exist (return early rather than fail)
- Print statements for debugging and visibility
- Binary existence checks before attempting to run
- Structured output with summary counts (success/failure)

## Verification

- File path: `crates/pdftract-cli/tests/forms_integration.rs`
- File size: 322 lines
- Compilation: PASS (cargo test --no-run)
- Test function count: 6 (3 active, 3 placeholders)
- Code review: All tests are non-empty and functional