Added better testing of the Context Initializers and TestSuite{}.Run()

[lonnblad]

• Copied the SuiteContext for testing with the new Context Initializers
• Added testing with TestSuite{}.Run() to fmt_output_test.go
• Added testing with TestSuite{}.Run() to run_test.go

[codecov]

Codecov Report

Merging #301 into master will increase coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   84.56%   84.84%   +0.27%     
==========================================
  Files          17       17              
  Lines        2521     2521              
==========================================
+ Hits         2132     2139       +7     
+ Misses        274      266       -8     
- Partials      115      116       +1     

Impacted Files	Coverage Δ
run.go	72.53% <0.00%> (+2.11%)	⬆️
test_context.go	42.85% <0.00%> (+28.57%)	⬆️

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