Streamline unittests

[jGaboardi]

Current implementation of unittests is becoming cumbersome:

• matrix of 4 testing scripts that test:
  • api and developer facing code
  • spatial data read from a .shp and a geopandas.GeoDataFrame

While retaining the basic testing of input, once certain values have been determined to be correct limit testing. For example, if the values of calculation A are equal following a data read from a .shp and a gdf, then calculation B needs only to be performed using the data from either the .shp or gdf, not both. In this way tests will run more quickly and be less time consuming to maintain.

[jGaboardi]

Current scripts:

1. test_network_api_from_gdf
2. test_network_api_from_shp
3. test_network_from_gdf
4. test_network_from_shp

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Merge these down to 2 scripts:

1. test_network_api
2. test_network

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In each other the two testing scripts:

• First test that data read in from a .shp and a gdf are equal.
• Then do the remainder of the unittests from only one of those read methods.

[jGaboardi]

Resolved in #153