Minor cleanup of benchmarks and tests

[jlperla]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 1884339676

• 75 of 84 (89.29%) changed or added relevant lines in 6 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+2.9%) to 86.992%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/utilities.jl	10	11	90.91%
src/nonlinear.jl	0	8	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/nonlinear.jl	4	0%

Totals
Change from base Build 1854651567:	2.9%
Covered Lines:	321
Relevant Lines:	369

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💛 - Coveralls

[codecov]

Codecov Report

Merging #49 (ab8b5f0) into main (9c0721e) will increase coverage by 2.89%.
The diff coverage is 89.28%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   84.09%   86.99%   +2.89%     
==========================================
  Files           8        7       -1     
  Lines         371      369       -2     
==========================================
+ Hits          312      321       +9     
+ Misses         59       48      -11     

Impacted Files	Coverage Δ
src/nonlinear.jl	0.00% <0.00%> (ø)
src/utilities.jl	90.90% <90.90%> (ø)
src/DifferenceEquations.jl	71.42% <100.00%> (+46.42%)	⬆️
src/kalman.jl	99.34% <100.00%> (ø)
src/linear.jl	94.91% <100.00%> (+0.36%)	⬆️
src/quadratic.jl	97.00% <100.00%> (-0.17%)	⬇️

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