Make segments names more clear in test_constraint_solver()

[sanderobdeijn]

Fix for #1378

[sanderobdeijn]

I didn't change the sketch variable names because the Sx seems to be the standard in all the tests. But I could also change those to sketch1, 2, etc

[codecov]

Codecov Report

Merging #1379 (98a99c9) into master (da6354f) will not change coverage.
The diff coverage is n/a.

❗ Current head 98a99c9 differs from pull request most recent head 4786aed. Consider uploading reports for the commit 4786aed to get more accurate results

@@           Coverage Diff           @@
##           master    #1379   +/-   ##
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  Coverage   94.12%   94.12%           
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  Files          27       27           
  Lines        5671     5671           
  Branches      961      961           
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  Hits         5338     5338           
  Misses        199      199           
  Partials      134      134           

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[jmwright]

Thanks @sanderobdeijn !