Add tests

[janbruedigam]

No description provided.

[codecov-io]

Codecov Report

Merging #46 (52f3519) into master (18498cc) will increase coverage by 3.91%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
+ Coverage   71.58%   75.49%   +3.91%     
==========================================
  Files          41       41              
  Lines        2984     2987       +3     
==========================================
+ Hits         2136     2255     +119     
+ Misses        848      732     -116     

Impacted Files	Coverage Δ
...rc/discretization/implicit_trapezoid/integrator.jl	0.00% <ø> (ø)
src/discretization/symplectic_euler/integrator.jl	96.72% <ø> (+8.01%)	⬆️
src/main_components/mechanism_functions.jl	72.59% <ø> (+12.73%)	⬆️
src/solver/linesearch.jl	84.81% <ø> (+2.09%)	⬆️
src/ui/mechanism_ui.jl	37.50% <100.00%> (+37.50%)	⬆️
src/util/quaternion.jl	95.91% <100.00%> (+34.55%)	⬆️
src/joints/translational.jl	90.50% <0.00%> (+1.89%)	⬆️
src/joints/rotational.jl	88.31% <0.00%> (+2.59%)	⬆️
src/main_components/graph.jl	93.40% <0.00%> (+3.29%)	⬆️
src/main_components/equalityconstraint.jl	79.03% <0.00%> (+4.83%)	⬆️
... and 8 more

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