Adjusted check_response so it can also handle single entries.

[JPBergsma]

In #1125 I noticed that the check_response function did not work for single entry endpoints.
This code should fix that issue.

closes #1125

[codecov]

Codecov Report

Merging #1130 (c4c8721) into master (6133cf1) will not change coverage.
The diff coverage is n/a.

❗ Current head c4c8721 differs from pull request most recent head 8a06903. Consider uploading reports for the commit 8a06903 to get more accurate results

@@           Coverage Diff           @@
##           master    #1130   +/-   ##
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  Coverage   92.38%   92.38%           
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  Files          68       68           
  Lines        3889     3889           
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  Hits         3593     3593           
  Misses        296      296           

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[ml-evs]

Minor changes requested below.

Do you plan on using this functionality somewhere? I see the other fixtures in the query params conftest.py (like checking for required response fields) will also only work for the multi-entry endpoints. Should they be updated too?

[JPBergsma]

I tried to use a test like this to find out what was going wrong with the single entry endpoint for the trajectories.
I could however also have formulated the test like the test classes in test_structures.py, so it is not so important.

[JPBergsma]

@ml-evs I have processed your comments.
Could you either approve this pull request or state that you do not think it is worth adding.
That way this PR can be closed.

[ml-evs]

Sorry @JPBergsma, this one got lost. If you think it is useful we can merge it; I'll rebase -> accept -> merge now if all the tests still pass.