[WIP] Fix fetcher tests

[Siedlerchr]

Fix some wrong data
Fix help pages
Use jsoup for parsing pre content in inspire fetcher

• Change in CHANGELOG.md described (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for bigger UI changes)
• Checked documentation: Is the information available and up to date? If not: Issue created at https://github.com/JabRef/user-documentation/issues.

[koppor]

it would be OK for me to remove these kind of tests completely. Think, the have been introduced in 2015 by students to increase test coverage.

[LinusDietz]

seems to be good

[Siedlerchr]

Nope, still some failing ones. https://travis-ci.org/JabRef/jabref/jobs/618489482?utm_medium=notification&utm_source=github_status

[Siedlerchr]

I don't understand why the equals is failing: I don't see a differencec

Edit: Debugging showed that PRIMARYCLASS is a standardfield argh!

org.opentest4j.AssertionFailedError: iterable contents differ at index [0], expected: 
org.jabref.model.entry.BibEntry@44a085e5<@phdthesis{Diez:2019pkg,
  archiveprefix = {arXiv},
  author = {Diez, Tobias},
  eprint = {1909.00744},
  primaryclass = {math.SG},
  reportnumber = {urn:nbn:de:bsz:15-qucosa2-352179},
  title = {Normal Form of Equivariant Maps and Singular Symplectic Reduction in Infinite Dimensions with Applications to Gauge Field Theory},
  year = {2019}
}> but was: org.jabref.model.entry.BibEntry@1a3e8e24<@phdthesis{Diez:2019pkg,
  archiveprefix = {arXiv},
  author = {Diez, Tobias},
  eprint = {1909.00744},
  primaryclass = {math.SG},
  reportnumber = {urn:nbn:de:bsz:15-qucosa2-352179},
  title = {Normal Form of Equivariant Maps and Singular Symplectic Reduction in Infinite Dimensions with Applications to Gauge Field Theory},
  year = {2019}
}>

[tobiasdiez]

LGTM. Can we merge this now so that the changes to the actual fetcher are still included in the 5.0 beta release?

[Siedlerchr]

Yes, most things should be fixed. I will continue after the merge.

[Siedlerchr]

I will just fix the ACS test then we can merge, the fetcher is broken