tox: Add code coverage

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

test-requirements.txt

@@ -1,2 +1,4 @@
-mock==2.0.0
-pytest>3.6,<4.0
+mock~=3.0.0
+pytest>=4.0,<6.0;python_version>='3.5'
+pytest>=4.0,<5.0;python_version=='2.7'
+pytest-cov>=2.7,<3.0

tests/__init__.py

@@ -8,7 +8,7 @@ basepython = python3
 deps =
   -r{toxinidir}/test-requirements.txt
 commands =
-  pytest -Wall {posargs}
+  pytest -Wall --cov=git_pw --cov-report term-missing {posargs}
 
 [testenv:pep8]
 skip_install = true
@@ -23,6 +23,22 @@ deps=
 commands=
   mypy {posargs:--ignore-missing-imports --follow-imports=skip} git_pw
 
+[testenv:report]
+skip_install = true
+deps =
+  coverage
+commands =
+  coverage report
+  coverage html
+
+[testenv:clean]
+envdir = {toxworkdir}/report
+skip_install = true
+deps =
+  {[testenv:report]deps}
+commands =
+  coverage erase
+
 [testenv:docs]
 deps =
   -r{toxinidir}/docs/requirements.txt