Fix test.sh to produce merged report that "go tool cover" understands.

[aalexand]

No description provided.

[codecov-io]

Codecov Report

Merging #236 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   61.48%   61.35%   -0.13%     
==========================================
  Files          34       34              
  Lines        6963     6963              
==========================================
- Hits         4281     4272       -9     
- Misses       2299     2308       +9     
  Partials      383      383

Impacted Files	Coverage Δ
internal/driver/webui.go	64.05% <0%> (-2.77%)	⬇️
internal/driver/commands.go	43.5% <0%> (-1%)	⬇️
internal/binutils/binutils.go	57.44% <0%> (-0.71%)	⬇️

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