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問題
こちらのテストの通り、FPDFのコンストラクタが呼ばれていないため、FPDFでゼロ除算が発生。
結果として、不正なPDF(/MediaBoxがサイズゼロ)が出力される。
修正
FPDFのコンストラクタを呼ぶようにしました。
補足
PHPUnitに慣れていないため、もしテストのより適切な書き方があればご変更・ご指示ください。