Test with 4 processes (3 workers)

[tkf]

This reverts commit 0fc7bf2.

[codecov]

Codecov Report

Merging #11 (b30b77f) into master (0221d79) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
- Coverage   91.02%   90.90%   -0.12%     
==========================================
  Files           2        2              
  Lines          78       77       -1     
==========================================
- Hits           71       70       -1     
  Misses          7        7              

Flag	Coverage Δ
Pkg.test	90.90% <ø> (-0.12%)	⬇️
Run.test	90.78% <ø> (ø)

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Impacted Files	Coverage Δ
src/darray.jl	97.05% <0.00%> (-0.09%)	⬇️

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[tkf]

@jpsamaroo Not sure if this is relevant to #10, but in #8 I found that the test hangs with Julia 1.8-DEV but not with Julia 1.6. https://github.com/JuliaFolds/FoldsDagger.jl/runs/4316965001?check_suite_focus=true

Also, in the current master branch (after #8), the entry point for the test will be a bit different (and should become a bit more robust for loading tests in multiple workers). I'm also trying to support the standard test entry point #12.