Added support for concurrent scenarios

[lonnblad]

Solution for #180

[codecov]

Codecov Report

Merging #311 into master will increase coverage by 0.13%.
The diff coverage is 87.87%.

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
+ Coverage   85.44%   85.58%   +0.13%     
==========================================
  Files          23       23              
  Lines        2659     2684      +25     
==========================================
+ Hits         2272     2297      +25     
  Misses        259      259              
  Partials      128      128              

Impacted Files	Coverage Δ
suite.go	86.75% <ø> (-0.18%)	⬇️
storage.go	90.44% <66.66%> (-0.58%)	⬇️
run.go	70.52% <85.41%> (+6.05%)	⬆️
fmt_base.go	94.24% <100.00%> (+0.08%)	⬆️
fmt_pretty.go	93.17% <100.00%> (-0.73%)	⬇️
test_context.go	71.42% <0.00%> (+28.57%)	⬆️

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[l3pp4rd]

Well done 👍

[lonnblad]

Well done 👍

thanks @l3pp4rd 😄