Implement "Roundtrip" Tests to Improve Integrity

The project should implement "roundtrip" tests in order to exercise validation and, hopefully, help prevent the defects that led to the need to release v9.01 and v9.02

1. Parse BOM that is known to be valid
2. Generate a BOM based on what has been parsed
3. Compare input and output - Should be the same, otherwise either parsing or generation is broken
4. Validate output against schema - Should be valid, otherwise generation is broken

既存の BOM parser、generator、schema-validation のテストまたはエントリポイントを特定します。既知の有効な BOM fixture から始め、parsing、generation、input/output の比較、schema validation を実行します。roundtrip test が成功し、無効な生成 output または一致しない serialization を検出できれば完了です。

索引モデルが issue の本文から書いたものです。