Add unit test for 1D constant lambda

[ischoegl]

Also, add contributor

Changes proposed in this pull request

Add unit test to ensure lambda is constant (update to #1594)

Checklist

• [x] The pull request includes a clear description of this code change
• [x] Commit messages have short titles and reference relevant issues
• [x] Build passes (scons build & scons test) and unit tests address code coverage
• [x] Style & formatting of contributed code follows contributing guidelines
• [x] The pull request is ready for review

[codecov[bot]]

Codecov Report

Merging #1598 (f174772) into main (717af98) will increase coverage by 0.01%. Report is 23 commits behind head on main. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1598      +/-   ##
==========================================
+ Coverage   70.58%   70.60%   +0.01%     
==========================================
  Files         379      379              
  Lines       59164    59152      -12     
  Branches    21263    21252      -11     
==========================================
  Hits        41763    41763              
+ Misses      14327    14316      -11     
+ Partials     3074     3073       -1     

see 29 files with indirect coverage changes

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