FillPDFServiceV2UnitTests.fillPDFServiceSSSuccess dumps a filled PDF to src/test/resources/ss-5_filled_out_test_fill.pdf on every test run. This is leftover debug code — the original author likely couldn't get IOUtils.contentEquals to work for InputStream comparison, so they wrote the file to disk for visual inspection and never replaced it with a proper assertion.
The test should assert that the filled PDF fields match the expected form answers, then clean up. No files should be written to disk.