DM-38601: Couple of small improvements in test methods

[andy-slac]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch coverage: 71.42% and project coverage change: +0.02 🎉

Comparison is base (7d2a789) 80.64% compared to head (1ecb914) 80.67%.

❗ Current head 1ecb914 differs from pull request most recent head 8612af0. Consider uploading reports for the commit 8612af0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
+ Coverage   80.64%   80.67%   +0.02%     
==========================================
  Files          57       57              
  Lines        6376     6380       +4     
  Branches     1303     1199     -104     
==========================================
+ Hits         5142     5147       +5     
  Misses        985      985              
+ Partials      249      248       -1     

Impacted Files	Coverage Δ
python/lsst/pipe/base/tests/no_dimensions.py	0.00% <0.00%> (ø)
python/lsst/pipe/base/tests/simpleQGraph.py	71.61% <100.00%> (+0.56%)	⬆️

... and 1 file with indirect coverage changes

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