# Verification Note for bf-lpyhe

## Summary
Enhanced assertion messages in `unmapped_glyph_names_config.rs` with diagnostic context following the pattern established in `cmap_unmapped_glyphs.rs`.

## Changes Made
Modified `/home/coding/pdftract/crates/pdftract-core/tests/unmapped_glyph_names_config.rs`:
- Enhanced 11 assertions across 4 test functions
- Each assertion now includes:
  - Expected value description
  - Actual value description  
  - Context about why the expectation exists
  - References to relevant configuration files (build/unmapped-glyph-names.json)

## Test Functions Enhanced
1. `test_unmapped_glyph_names_defaults_to_empty` - 4 assertions
2. `test_unmapped_glyph_names_specified` - 4 assertions
3. `test_unmapped_glyph_names_empty_array` - 2 assertions
4. `test_unmapped_glyph_names_minimal_config` - 3 assertions

## Verification
**PASS** - All acceptance criteria met:
- [x] All assertion messages follow a consistent format (expected/actual/why)
- [x] Each message explains expected value, actual value, and rationale
- [x] Messages reference build/unmapped-glyph-names.json where relevant
- [x] No generic assertions without context

## Test Results
```
unmapped_glyph_names_config: 4/4 passed
cmap_unmapped_glyphs: 7/7 passed
```

## Commit
- Hash: `53585e34`
- Message: "test(bf-lpyhe): enhance assertion messages with diagnostic context"
- Files changed: 1 file, 119 insertions(+), 13 deletions(-)

## Example Enhanced Assertion
```rust
assert!(
    config.unmapped_glyph_names.is_empty(),
    "unmapped_glyph_names should default to empty for completely empty config. \
     Expected: empty Vec. \
     Found: {:?}. \
     Why this matters: The #[serde(default)] attribute ensures the field is always present \
     as an empty Vec, never None, even when the entire config is just {{}}.",
    config.unmapped_glyph_names
);
```