Fix step fixture injection with multiple steps

[youtux]

Fixes #689
Supersedes #690

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.37%. Comparing base (d517a80) to head (865fbe0).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #700      +/-   ##
==========================================
+ Coverage   95.35%   95.37%   +0.02%     
==========================================
  Files          50       50              
  Lines        1828     1838      +10     
  Branches      201      201              
==========================================
+ Hits         1743     1753      +10     
  Misses         53       53              
  Partials       32       32              

Flag	Coverage Δ
	95.37% <100.00%> (+0.02%)	⬆️

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