Add coverge reporting in CI and upload to codecov

.github/workflows/regression-tests.yml

@@ -30,3 +30,8 @@ jobs:
 
     - name: Test with tox
       run: tox
+
+    - name: Upload coverage to codecov
+      run: |
+        pip install codecov
+        codecov

.gitignore

@@ -11,3 +11,4 @@ __pycache__/
 
 .tox
 sim_build_*
+.coverage

setup.cfg

@@ -53,10 +53,30 @@ python =
     3.9: py39
 
 [testenv]
+setenv =
+    COVERAGE=1 
+
 deps =
     pytest
     pytest-xdist
     cocotb-test
+    coverage
+    pytest-cov
 
 commands =
-    pytest -n auto
+    pytest --cov=cocotbext --cov=tests --cov-branch -n auto
+    bash -c 'find . -type f -name "\.coverage" | xargs coverage combine --append'
+
+whitelist_externals =
+    bash
+
+# combine if paths are different
+[coverage:paths]
+source =
+    cocotbext/
+    /*/cocotbext
+
+# do not report dependencies
+[coverage:report]
+omit = 
+   .tox/*