Uniform helper method names in checkout specs

[rainerdema]

Summary

Fixes #248

Refer to the issue description for more information about why this refactor was done.

Checklist

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[codecov[bot]]

Codecov Report

Merging #287 (977b499) into master (b04dedd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #287   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          27       27           
  Lines         489      489           
=======================================
  Hits          487      487           
  Misses          2        2           

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