chore(pytest): introduce branch coverage to addopts in pyproject.toml

pyproject.toml

@@ -86,7 +86,7 @@ jupyter-nbextensions-configurator = "^0.6.1"
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 python_files = ["test_*.py"]
-addopts = "--strict-markers --suppress-no-test-exit-code --color=yes"
+addopts = "--strict-markers --suppress-no-test-exit-code --color=yes --cov-branch -v"
 filterwarnings = "error"
 markers = "webtest: mark a test as requiring internet connecttion"