Fix registers add tests

[codecov-commenter]

Codecov Report

Merging #261 (4a1f823) into master (0f51575) will decrease coverage by 0.02%. The diff coverage is 91.11%.

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@@            Coverage Diff             @@
##           master     #261      +/-   ##
==========================================
- Coverage   90.09%   90.07%   -0.02%     
==========================================
  Files          34       34              
  Lines        2755     2791      +36     
==========================================
+ Hits         2482     2514      +32     
- Misses        273      277       +4     

Impacted Files	Coverage Δ
mapentity/registry.py	95.74% <ø> (ø)
mapentity/tests/__init__.py	96.08% <90.00%> (-0.77%)	:arrow_down:
mapentity/models.py	88.63% <100.00%> (+0.08%)	:arrow_up:

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