Add code coverage checker - closes #43

.gitignore

@@ -1,4 +1,5 @@
 *.deb
+cover/
 
 # Byte-compiled / optimized / DLL files
 __pycache__/

Makefile

@@ -31,6 +31,11 @@ unittest_test:
 stylecheck:
 	flake8 --max-line-length=132 .
 
+coverage:
+	rm -r cover/
+	nosetests tests/test_Direct.py --with-coverage --cover-package=email2pdf --cover-erase --cover-html
+	open cover/email2pdf.html
+
 clean:
 	rm -f *.deb
 	rm -f *.log

README.md

@@ -69,6 +69,11 @@ All the unit tests are in the `tests/` directory. You can run them from the
 Makefile using the `unittest` or `unittest_test` targets (the second is more
 verbose, and stops on failing tests).
 
+### Code Coverage
+
+There is a code coverage target in the Makefile. You'll need to have the
+`coverage` Python module installed (`pip3 install coverage`) to run it.
+
 ### Debian
 
 * Install all the package dependencies listed in the