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In this article (in french), I wrote 6 months ago, I was searching for a mockito-like syntax to stub only one method of an object instance under test. Mockito brought it in it’s latest version. Read more…

Blog Java, mockito, mocks, unit tests

If you generate a pdf file in your application, there is an easy way to unit test its content using pdfBox.

I tend to prefer iText to generate pdfs but pdfBox is easy enough to use to verify documents:

First, you need to import pdfBox in your pom.xml:

<dependency>
   <groupid>org.pdfbox</groupid>
   <artifactid>com.springsource.org.pdfbox</artifactid>
   <version>0.7.3</version>
   <scope>test</scope>
</dependency>

Here is a method to extract the whole text from a pdf:

private static String extractPdfText(byte[] pdfData) throws IOException {
   PDDocument pdfDocument = PDDocument.load(new ByteArrayInputStream(pdfData));
   try {
      return new PDFTextStripper().getText(pdfDocument);
   } finally {
      pdfDocument.close();
   }
}

This is useful to verify that the pdf you’ve generated contains a given piece of text (I use Fest Assert for assertions):

assertThat(extractPdfText(pdfData)).contains("a text").contains("another text");

Here is another piece of code (more obscure) to verify that a pdf file is signed:

private static boolean isSigned(byte[] pdfData) throws IOException {
  PDDocument pdfDocument = PDDocument.load(new ByteArrayInputStream(pdfData));
  try {
    COSDictionary trailer = pdfDocument.getDocument().getTrailer();
    COSDictionary root = (COSDictionary) trailer.getDictionaryObject(COSName.ROOT);
    COSDictionary acroForm = (COSDictionary) root.getDictionaryObject(COSName.getPDFName("AcroForm"));
    if (null != acroForm) {
      COSArray fields = (COSArray) acroForm.getDictionaryObject(COSName.getPDFName("Fields"));
      for (int i = 0; i < fields.size(); i++) {
        COSDictionary field = (COSDictionary) fields.getObject(i);
        String type = field.getNameAsString("FT");
        if ("Sig".equals(type)) {
          return true;
        }
      }
    }
  } finally {
    pdfDocument.close();
  }

  return false;
}

Blog fest assert, pdf, pdfbox, unit tests