the unit test in ACSTest need to update

[leaf-soba]

JabRef version

5.15 (latest release)

Operating system

macOS

Details on version and operating system

No response

Checked with the latest development build (copy version output from About dialog)

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. run unit test method findByDOI in ACSTest

• failed reason:the link of this case https://pubs.acs.org/doi/pdf/10.1021/bk-2006-STYG.ch014 become "Page Not Found"
  

2. I checked all elements in another page but it don't have element a.button_primary, which is used in org.jabref.logic.importer.fetcher.ACS to find Fulltext PDF, maybe it need fix to use another method to check whether Fulltext PDF exists or not.

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[Siedlerchr]

@koppor You already took a look at the AcsFetcher, right?

[koppor]

Yes, used to try other scraping frameworks. See commits at koppor#695