# Sprint 9 Phase 3: Runtime Large Files (400-700 lines) Mutation Gaps
**Date**: 2025-10-05
**Scope**: Runtime files 400-700 lines
**Goal**: Identify and address mutation gaps in larger runtime files
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## File 1: eval_method.rs (409 lines) - 2 MISSED / 35 total (94% coverage) ✅ FIXED
### MISSED Mutations (NOW FIXED)
1. **Match Arm Deletion** (line 52) ✅
- Pattern: `delete match arm Value::Float(f) in dispatch_method_call`
- Type: Match arm deletion
- Test added: `test_dispatch_method_call_float_match_arm`
2. **Logical Operator** (line 29) ✅
- Pattern: `replace && with || in eval_method_call`
- Type: Logical operator mutation
- Test added: `test_eval_method_call_logical_operator`
**Status**: +2 tests added, 3539 tests passing
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## File 2: eval_string_methods.rs (418 lines) - 7 MISSED / 58 total (88% coverage) ✅ IDENTIFIED
### MISSED Mutations
1. **Match Arm: "ceil"** (line 280)
- Pattern: `delete match arm "ceil" in eval_float_method`
- Type: Match arm deletion
- Priority: Medium
2. **Match Arm: "to_string"** (line 35)
- Pattern: `delete match arm "to_string" in eval_zero_arg_string_method`
- Type: Match arm deletion
- Priority: Medium
3. **Match Arm: "chars"** (line 40)
- Pattern: `delete match arm "chars" in eval_zero_arg_string_method`
- Type: Match arm deletion
- Priority: Medium
4. **Match Arm: "trim"** (line 37)
- Pattern: `delete match arm "trim" in eval_zero_arg_string_method`
- Type: Match arm deletion
- Priority: Medium
5. **Match Arm: "sqrt"** (line 276)
- Pattern: `delete match arm "sqrt" in eval_float_method`
- Type: Match arm deletion
- Priority: Medium
6. **Logical Operator** (line 317)
- Pattern: `replace && with || in eval_generic_method`
- Type: Logical operator mutation
- Priority: High
7. **Match Arm: "starts_with"** (line 55)
- Pattern: `delete match arm "starts_with" in eval_single_arg_string_method`
- Type: Match arm deletion
- Priority: Medium
**Note**: Most mutations are match arm deletions for string/float methods.
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## File 3: eval_try_catch.rs (419 lines) - Not yet tested
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## File 4: eval_pattern.rs (421 lines) - Not yet tested
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## File 5: cache.rs (422 lines) - Not yet tested
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## Summary
**Files Tested**: 2/10 (eval_method.rs fixed, eval_string_methods.rs identified)
**Total Mutations Found**: 93 (35 + 58)
**MISSED**: 10 total (2 fixed, 8 identified)
**CAUGHT**: 83 (89.2%)
**Pattern Analysis**:
- Match Arm Deletions: 9 (90%)
- Logical Operators: 1 (10%)
**Test Progress**:
- eval_method.rs: +2 mutation tests added ✅
- eval_string_methods.rs: 8 mutations identified, tests pending
- Total Test Suite: 3539 passing (+2 from 3537)