Add unit test coverage

.gitignore

@@ -2,3 +2,4 @@
 *.egg-info/
 __pycache__
 .tox
+.coverage

.gitlab-ci.yml

@@ -10,7 +10,7 @@ cache:
 
 linter:
   stage: test
-  image: python:3
+  image: python:3.10
 
   cache:
     paths:
@@ -31,7 +31,7 @@ linter:
 
 tests:
   stage: test
-  image: python:3
+  image: python:3.10
 
   cache:
     paths:
@@ -43,6 +43,9 @@ tests:
   script:
     - tox
 
+  # Process coverage report so that it shows up in Gitlab interface
+  coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'
+
 bump-python-deps:
   stage: release
   image: registry.gitlab.teklia.com/infra/devops:latest

tox.ini

 [tox]
 envlist = nerval
 
+[tool:pytest]
+testpaths = tests
+addopts =
+    --cov-report=term-missing
+
+
 [testenv]
 commands =
-  pytest {posargs}
+  pytest --cov=nerval {posargs}
 
 deps =
   pytest
   pytest-lazy-fixture
+  pytest-cov
   -rrequirements.txt