fix: stabilize the order of resource helper methods and tests

[software-dov]

Fix for #581

[codecov]

Codecov Report

Merging #582 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #582   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines         1508      1477   -31     
  Branches       308       308           
=========================================
- Hits          1508      1477   -31     

Impacted Files	Coverage Δ
gapic/schema/api.py	100.00% <0.00%> (ø)
gapic/schema/imp.py	100.00% <0.00%> (ø)
gapic/utils/cache.py	100.00% <0.00%> (ø)
gapic/schema/metadata.py	100.00% <0.00%> (ø)
gapic/schema/wrappers.py	100.00% <0.00%> (ø)
gapic/generator/options.py	100.00% <0.00%> (ø)
gapic/samplegen/samplegen.py	100.00% <0.00%> (ø)
gapic/samplegen_utils/types.py	100.00% <0.00%> (ø)

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