Add tests for solvers

[utkarsh530]

Fixes: SciML/NonlinearSolve.jl#48 (comment)
@ChrisRackauckas

[codecov]

Codecov Report

Merging #8 (2f49790) into master (6a1a088) will increase coverage by 85.71%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master       #8       +/-   ##
===========================================
+ Coverage    0.00%   85.71%   +85.71%     
===========================================
  Files           2        2               
  Lines          51       49        -2     
===========================================
+ Hits            0       42       +42     
+ Misses         51        7       -44     

Impacted Files	Coverage Δ
src/algorithms.jl	75.00% <0.00%> (+75.00%)	⬆️
src/solve.jl	86.66% <0.00%> (+86.66%)	⬆️

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