[WIP] increase code coverage

[codecov[bot]]

Codecov Report

Merging #153 into master will increase coverage by 1.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   98.70%   99.80%   +1.09%     
==========================================
  Files          49       49              
  Lines        4029     4027       -2     
  Branches      721      713       -8     
==========================================
+ Hits         3977     4019      +42     
+ Misses         19        3      -16     
+ Partials       33        5      -28     

Impacted Files	Coverage Δ
...w3d/common/structs/mesh_structs/shader_material.py	100.00% <ø> (+2.11%)	:arrow_up:
io_mesh_w3d/common/structs/animation.py	100.00% <100.00%> (+3.70%)	:arrow_up:
io_mesh_w3d/common/structs/collision_box.py	100.00% <100.00%> (+3.57%)	:arrow_up:
io_mesh_w3d/common/structs/hierarchy.py	100.00% <100.00%> (+3.30%)	:arrow_up:
io_mesh_w3d/common/structs/hlod.py	100.00% <100.00%> (+2.77%)	:arrow_up:
io_mesh_w3d/common/structs/mesh.py	100.00% <100.00%> (+4.05%)	:arrow_up:
...o_mesh_w3d/common/structs/mesh_structs/aabbtree.py	100.00% <100.00%> (+0.77%)	:arrow_up:
io_mesh_w3d/common/utils/material_export.py	100.00% <100.00%> (+3.20%)	:arrow_up:
io_mesh_w3d/common/utils/material_import.py	98.83% <100.00%> (+0.57%)	:arrow_up:
... and 2 more

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