interpreter: (pdl) add test for result matching

[superlopuh]

Another PR adding tests to existing PDL infrastructure.

Note stacked PR

[jianyicheng]

I see what you meant but it may be helpful to add singe-sentence comments to explain what each assertion is doing. They look all the same and took me a few mins to figure out...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (029c9f5) to head (c9bd086).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3465      +/-   ##
==========================================
+ Coverage   90.22%   90.24%   +0.02%     
==========================================
  Files         462      462              
  Lines       57734    57761      +27     
  Branches     5565     5565              
==========================================
+ Hits        52090    52127      +37     
+ Misses       4198     4193       -5     
+ Partials     1446     1441       -5     

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