Added coverage to test requirements

.coveragerc

+# .coveragerc to control coverage.py
+[run]
+branch = True
+source = coffee_bot
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if __name__ == .__main__.:
+
+ignore_errors = True
+
+[html]
+directory = coverage_html_report

README.md

@@ -20,4 +20,5 @@ pip install -r requirements-local.txt
 ```
 The supported IDE for this project is VScode
 
-run tests by `python -m pytest`
+To run tests: `python -m pytest`
+To run coverage: `coverage run -m pytest; coverage report -m`

requirements-test.txt

@@ -3,3 +3,4 @@
 mock==4.0.3
 pytest==6.2.2
 pylint==2.7.1
+coverage==5.5