# Test Failures — Iteration 6558b058

## Summary
✅ **ALL TESTS PASSED** - No failures detected

## Test Coverage Analysis

### Acceptance Criteria Coverage

**AC1: Create benches/parser_benchmarks.rs with parser_simple, parser_complex, parser_variables benchmarks**
- ✅ **COVERED**: File exists at `benches/parser_benchmarks.rs`
- ✅ **COVERED**: All three benchmarks implemented:
  - `parser_simple` - Simple arithmetic (2 + 3)
  - `parser_complex` - Complex expression ((10 + 20) * 3 / 2 - 8 % 4)
  - `parser_variables` - Variable assignments (x=10; y=20; z=x+y; print(z))
- ✅ **TEST**: `test_all_three_parser_benchmarks_configured` validates all three are in criterion_group
- ✅ **TEST**: `test_parser_benchmarks_file_exists` validates file existence

**AC2: Pre-tokenize input outside benchmark loop to isolate parser performance**
- ✅ **COVERED**: All benchmarks call `lexer::lex()` outside `c.bench_function()`
- ✅ **COVERED**: Tokens are cloned inside the benchmark loop for proper isolation
- ✅ **TEST**: `test_parser_benchmarks_pretokenize_verification` validates the pattern via code inspection

**AC3: Criterion generates estimates.json for each benchmark**
- ✅ **COVERED**: All three estimates.json files exist:
  - `target/criterion/parser_simple/base/estimates.json` (982 bytes)
  - `target/criterion/parser_complex/base/estimates.json` (986 bytes)
  - `target/criterion/parser_variables/base/estimates.json` (985 bytes)
- ✅ **TEST**: `test_parser_simple_benchmark_exists` validates parser_simple JSON
- ✅ **TEST**: `test_parser_complex_benchmark_exists` validates parser_complex JSON
- ✅ **TEST**: `test_parser_variables_benchmark_exists` validates parser_variables JSON

**AC4: CV < 5% for all benchmarks**
- ✅ **COVERED**: All benchmarks achieved CV well below 5%:
  - parser_simple: **3.80%** (mean: 82.46 ns, stddev: 3.14 ns)
  - parser_complex: **3.00%** (mean: 239.78 ns, stddev: 7.21 ns)
  - parser_variables: **1.87%** (mean: 226.77 ns, stddev: 4.25 ns)
- ✅ **TEST**: `test_parser_simple_cv_below_5_percent` validates CV < 5%
- ✅ **TEST**: `test_parser_complex_cv_below_5_percent` validates CV < 5%
- ✅ **TEST**: `test_parser_variables_cv_below_5_percent` validates CV < 5%

### Edge Case Coverage

**Edge Case 1: Empty Input**
- ✅ **TEST**: `test_edge_case_parser_handles_empty_input` - Verifies parser handles empty token streams gracefully

**Edge Case 2: Deeply Nested Expressions**
- ✅ **TEST**: `test_edge_case_parser_deeply_nested_expressions` - Tests ((((1+2)+3)+4)+5)

**Edge Case 3: All Arithmetic Operators**
- ✅ **TEST**: `test_edge_case_parser_all_operators` - Tests + - * / % in single expression

**Edge Case 4: Multiple Statements**
- ✅ **TEST**: `test_edge_case_parser_multiple_statements` - Tests multiple variable assignments

**Edge Case 5: Invalid Syntax**
- ✅ **TEST**: `test_edge_case_parser_invalid_syntax` - Tests error handling for malformed input

**Edge Case 6: Criterion Configuration**
- ✅ **TEST**: `test_criterion_configuration_for_low_variance` - Validates sample_size and measurement_time config

## Benchmark Execution Results

### Successful Benchmark Runs
All benchmarks executed successfully with the following results:

```
parser_simple           time:   [81.647 ns 81.854 ns 82.089 ns]
                        Found 36 outliers among 1000 measurements (3.60%)

parser_complex          time:   [239.52 ns 240.07 ns 240.60 ns]
                        Found 7 outliers among 1000 measurements (0.70%)

parser_variables        time:   [226.70 ns 227.05 ns 227.43 ns]
                        Found 28 outliers among 1000 measurements (2.80%)
```

### Test Execution Results
- **Total tests created**: 15
- **Tests passed**: 15
- **Tests failed**: 0
- **Library tests**: 344 passed, 0 failed

## Files Modified/Created

### Coder's Changes
- ✅ `benches/parser_benchmarks.rs` - Created with all 3 benchmarks
- ✅ `Cargo.toml` - Added parser_benchmarks bench target

### QA's Additions
- ✅ `tests/test_parser_benchmarks.rs` - Created comprehensive test suite (15 tests)

## Validation Summary

**All acceptance criteria have been met:**
1. ✅ AC1: All three benchmarks exist and are properly configured
2. ✅ AC2: Pre-tokenization correctly implemented outside benchmark loop
3. ✅ AC3: All estimates.json files generated successfully
4. ✅ AC4: All CVs < 5% (best: 1.87%, worst: 3.80%)

**Additional quality measures:**
- ✅ No regression in existing tests (344/344 passed)
- ✅ Edge cases covered comprehensively
- ✅ Code follows existing benchmark patterns
- ✅ Criterion configuration optimized for low variance (sample_size=1000, measurement_time=10s)

## Conclusion

**Status**: ✅ **PASS**

The coder successfully implemented all acceptance criteria for the parser-benchmarks issue. The implementation:
- Correctly isolates parser performance from lexer by pre-tokenizing
- Achieves excellent stability with all CVs between 1.87% and 3.80%
- Generates all required estimates.json files
- Follows best practices for Criterion benchmarking
- Includes no regressions to existing functionality

The QA process added comprehensive test coverage including 15 validation tests and 5 edge case tests, all of which pass successfully.
