Feature/better test messages

[eddelbuettel]

Minor refactoring / cleanup for the new tinytest-based test files

Checklist

• Code compiles correctly
• R CMD check still passes all tests
• Document the changes by file in ChangeLog

[codecov-io]

Codecov Report

Merging #1033 into master will increase coverage by 18.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #1033       +/-   ##
==========================================
+ Coverage   70.67%     89%   +18.33%     
==========================================
  Files          64      64               
  Lines        3038    3038               
==========================================
+ Hits         2147    2704      +557     
+ Misses        891     334      -557

Impacted Files	Coverage Δ
R/Module.R	98.51% <0%> (+0.99%)	⬆️
inst/include/Rcpp/vector/proxy.h	94.11% <0%> (+11.76%)	⬆️
inst/include/Rcpp/internal/Proxy_Iterator.h	100% <0%> (+15.38%)	⬆️
R/Attributes.R	90.37% <0%> (+21.11%)	⬆️
src/attributes.cpp	97.92% <0%> (+25.11%)	⬆️
R/RcppClass.R	73.75% <0%> (+73.75%)	⬆️
R/Rcpp.package.skeleton.R	82.22% <0%> (+82.22%)	⬆️
R/loadModule.R	94% <0%> (+94%)	⬆️

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