Added features to the in-mem storage

[lonnblad]

No description provided.

[codecov]

Codecov Report

Merging #306 into master will increase coverage by 0.69%.
The diff coverage is 96.18%.

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
+ Coverage   85.50%   86.19%   +0.69%     
==========================================
  Files          19       19              
  Lines        2698     2681      -17     
==========================================
+ Hits         2307     2311       +4     
+ Misses        256      245      -11     
+ Partials      135      125      -10     

Impacted Files	Coverage Δ
storage.go	90.56% <91.66%> (+12.30%)	⬆️
fmt.go	94.76% <100.00%> (+1.07%)	⬆️
fmt_cucumber.go	93.02% <100.00%> (+0.16%)	⬆️
fmt_events.go	97.59% <100.00%> (+0.03%)	⬆️
fmt_junit.go	95.91% <100.00%> (+0.04%)	⬆️
fmt_pretty.go	93.87% <100.00%> (+0.10%)	⬆️
fmt_progress.go	100.00% <100.00%> (ø)
run.go	75.33% <100.00%> (+0.16%)	⬆️
suite.go	86.01% <100.00%> (-0.80%)	⬇️
suite_context.go	79.94% <100.00%> (+0.11%)	⬆️
... and 1 more

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