Merge pull request #200 from liornoy/coverage-doc

Add explanation to the coverage analysis tool

documentation/coverage_guide.md

@@ -0,0 +1,30 @@
+# Code Coverage
+#### *official documentation: https://coverage.readthedocs.io* 
+---
+
+**Code coverage** is a way to determine the number of lines of code that is
+successfully validated under a test procedure.
+In different words, it is used to find dead code (unused) and it's a good idea
+to find code that can no longer be executed and remove it.
+Removing the dead code increases the source code's readability.
+
+## Quick start
+
+1. To run the coverage test use:
+`pipenv run coverage run -m pytest`
+This will execute the test suit and analyze the code coverage.
+
+2. In Order to see the results enter:
+`pipenv run coverage report`
+
+preview of result:
+
+![coverage_report](https://user-images.githubusercontent.com/40122521/128600397-d2be1f4f-b10a-460d-9ca6-7f80859a0e34.png)
+
+3. A more visual and interactive report enter:
+`pipenv run coverage html`
+in order to see this visual report you can open it in VScode
+and open htmlcov/index.html with  something called Live Server.
+
+preview:
+![coverate_htm_report](https://user-images.githubusercontent.com/40122521/128600460-a111d5f9-f6a2-4377-8281-29bea0e7b41f.png)