improve test coverage, fix a bug

[geospatial-jeff]

What I am changing

The main goal of this PR was to improve test coverage. Two cases were not covered:

• Calling parse_geometry_obj on an object with no type member.
• Creating a geometry from an object implementing the __geo_interface__ protocol.

Testing the first case revealed a bug that is also fixed in this PR.

How you can test it

Run pytest!

[codecov-commenter]

Codecov Report

Merging #45 (09fba98) into master (1302fb5) will increase coverage by 1.94%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master       #45      +/-   ##
===========================================
+ Coverage   98.05%   100.00%   +1.94%     
===========================================
  Files           4         4              
  Lines         103       103              
===========================================
+ Hits          101       103       +2     
+ Misses          2         0       -2     

Flag	Coverage Δ
unittests	100.00% <ø> (+1.94%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
geojson_pydantic/geometries.py	100.00% <ø> (+1.51%)	⬆️
geojson_pydantic/features.py	100.00% <0.00%> (+3.33%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1302fb5...09fba98. Read the comment docs.

[vincentsarago]

🙏