TST: remove some more warnings

[jreback]

TST: parametrize stata tests

[codecov]

Codecov Report

Merging #17645 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #17645      +/-   ##
==========================================
+ Coverage   91.22%   91.24%   +0.01%     
==========================================
  Files         163      163              
  Lines       49661    49660       -1     
==========================================
+ Hits        45303    45311       +8     
+ Misses       4358     4349       -9

Flag	Coverage Δ
#multiple	89.03% <100%> (+0.03%)	⬆️
#single	40.17% <28.57%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/util/testing.py	100% <ø> (ø)	⬆️
pandas/core/dtypes/missing.py	90.44% <100%> (+3.25%)	⬆️
pandas/core/internals.py	94.31% <100%> (+0.01%)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.77% <0%> (-0.1%)	⬇️
pandas/plotting/_converter.py	65.2% <0%> (+1.81%)	⬆️

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[gfyoung]

@jreback : While we can, might as well correct "moar" to "more" in your commit message. 😄