test intructions

README.md

 # Routing for Electric Vehicles
+## Tests
+Teste are done using PyTest. To run the tests, the 
+dev dependencies must be installed:
+
+```shell script
+pipenv install --dev
+```
+
+Then simply run pytest within the root folder:
+
+```shell script
+pipenv shell pytest
+```
 
 ## Extras
 
@@ -7,7 +20,7 @@
 To draw all graphs, respectively create ```.tex``` snippets (that make use of the 
 [tikz-network](https://www.ctan.org/pkg/tikz-network)), use:
 
-```bash
+```shell script
 python draw_graphs.py [path]
 
     path -  Path to the location where the .tex files