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我使用带有可见签名的 JSignPdf 签署 PDF 文档。正确地做到这一点非常重要，所以我想做 JUnit 测试，检查这个签名（可见）是否存在。我写了 test which check has document got signature 但我不知道如何检查它是否有可见的签名。是否可以使用例如 iText 加载文档并检查它？