# Test Fixture Fix Summary

## Problem

192 tests were failing due to two related issues:

### Issue 1: Corrupted Coverage Database

- **Symptom**: Tests timing out after ~16 minutes (974 seconds)
- **Root Cause**: Corrupted `.coverage` database files
- **Impact**: Coverage collection taking 176+ seconds per test file
- **Fix**: Delete corrupted coverage files
  ```bash
  find . -name ".coverage" -o -name ".coverage.*" | xargs rm -f
  rm -rf htmlcov
  ```

### Issue 2: Test Fixture Bug

- **Symptom**: Tests failing with `assert None == expected_value`
- **Root Cause**: Mock filesystem not configured, causing `read_file()` to return `None`
- **Pattern**: Tests use `mock_filesystem` fixture but don't configure `read_file()` return value
- **Impact**: Code returns `None` when reading mocked files

## Fix Pattern

### Before (BROKEN):

```python
def test_get_current_version_success(self, publish_manager) -> None:
    pyproject_content = """
[project]
version = "1.2.3"
"""
    with patch.object(
        publish_manager.filesystem,
        "read_file",
        return_value=pyproject_content,  # This doesn't work!
    ):
        version = publish_manager._get_current_version()
        assert version == "1.2.3"
```

### After (FIXED):

```python
def test_get_current_version_success(self, publish_manager, temp_pkg_path) -> None:
    pyproject_content = """
[project]
version = "1.2.3"
"""
    # Create the actual file (so Path.exists() returns True)
    pyproject_path = temp_pkg_path / "pyproject.toml"
    pyproject_path.write_text(pyproject_content)

    # Configure mock filesystem to return the file content
    publish_manager.filesystem.read_file.return_value = pyproject_content

    version = publish_manager._get_current_version()
    assert version == "1.2.3"
```

## Why This Works

1. **File Creation**: Creating the actual file ensures `Path.exists()` returns `True`
1. **Mock Configuration**: Setting `read_file.return_value` ensures the mock returns content
1. **No Context Manager**: Direct assignment is clearer than `patch.object()` context manager

## Performance Impact

- **Before**: Test collection ~176 seconds per file (with corrupted coverage)
- **After**: Test collection ~8-10 seconds per file (without coverage)
- **Improvement**: ~20x faster test execution

## Status

- ✅ Root cause identified
- ✅ Fix pattern established
- ✅ First test fixed and passing
- ⏳ Remaining 191 tests need fixing

## Configuration Note

**Current caching settings** (`settings/crackerjack.yaml:97-100`):

```yaml
enable_caching: true
cache_backend: "memory"  # In-memory caching (default)
cache_ttl: 3600  # seconds
cache_max_entries: 100
```

**To enable disk caching**: Change `cache_backend: "tool_proxy"` in settings.
