How can I test a PDF document if it is PDF/A compliant?

Do you have Adobe PDFL or Acrobat Professional? You can use preflight operation if you do.

A list of PDF/A validators is on the pdfa.org web site here:

verapdf

A free online PDF/A validator is available here:

http://www.validatepdfa.com/

A report on the accuracy of many of these PDF/A validators is available from PDFLib:

https://www.pdflib.com/fileadmin/pdflib/pdf/pdfa/2009-05-04-Bavaria-report-on-PDFA-validation-accuracy.pdf

Se as well:

https://www.pdflib.com/knowledge-base/pdfa/

The 3-Heights™ PDF Validator Online Tool provides good feedback for different PDF/A conformance levels and versions.

pdf validation with OPEN validator:

DROID (Digital Record Object Identification) https://github.com/digital-preservation/droid/

JHOVE - JSTOR/Harvard Object Validation Environment https://jhove.openpreservation.org/

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