Using CSR format in PoissonTests.jl

[amartinhuertas]

No description provided.

[codecov-commenter]

Codecov Report

Merging #66 (e6f96a4) into master (f754e7a) will decrease coverage by 1.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   88.08%   87.04%   -1.05%     
==========================================
  Files           9        9              
  Lines         764      764              
==========================================
- Hits          673      665       -8     
- Misses         91       99       +8     

Impacted Files	Coverage Δ
src/PETScLinearSolvers.jl	86.44% <0.00%> (-13.56%)	⬇️

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