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Software testing a pdf is created correctly

• I have written a REST application in laravel. It accepts a Json payload and creates a formatted pdf using this data. Is it possible to write a test that checks the pdf has been generated correctly? Edit: Ideally I'd like to know the pdf is not corrupted, ie. Will open in a pdf reader. Also it would be good to somehow check the content of the pdf. For example... does it contain the customers name? Thanks.

• Answer:

  Yes this is possible, given that the same JSON input always generates the same PDF. You wouldn't really check the PDF file. PDF is a complex format, based on PostScript and some dark magic. What you can do is generate a “sample” PDF once, then write a unit test that uses the same input data to generate a PDF file, then compare this to your sample. This would look something like (just some example code): $myPdf = $pdfGenerator->generatePdf(); $samplePdf = file_get_contents('/some/example/file.pdf'); // with PHPunit $this->assertEquals(0, strcmp($myPdf, $samplePdf)); That's a bit dirty, but it does the job … if something in your PDF or JSON implementation changes, the unit test will make you aware of it. It is important, however, that your PDF generator does not insert any “dynamic” data, such as date stamps. In that case, the PDF files could obviously never be identical.