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The installation package includes two tools, Akeeba eXtract Wizard and Extract CLI. See https://github.com/akeeba/nativexplatform/wiki

You may need to add the installation folder to your path. The installation folder is detailed in https://github.com/akeeba/nativexplatform/wiki/Installation-and-uninstallation

Then you can run Extract CLI with:

extractCLI c:\path\to\archive.jpa c:\path\to\extract\into [-p JpsPassword] [--test]

The things in brackets are optional parameters. Since you only want to test the archive you could do

extractCLI c:\path\to\archive.jpa %temp% --test

or if you have a JPS file

extractCLI c:\path\to\archive.jps %temp% -p YourJPSPassword --test

The %temp% is a Windows shorthand which always points to the Windows temp folder. We are using it as our extraction target because the tool requires an extraction target folder even if nothing is extracted.

The --test option makes sure that nothing is, in fact, extracted to disk. extractCLI will go through the entire process of reading the file, decompressing the files etc but the extracted data will be discarded. Moreover, if the extraction fails it will return the command line error level to 250.

Yes, my use case writing this tool was similar to yours. I wanted to make sure that the archives I am generating with the backup engine can be extracted by both Kickstart and eXtract Wizard. So I wrote CLI interfaces to both which allowed me to automate my tests.