fix: configure coverage path mapping for CI

Author: Verdenroz

noxfile.py

@@ -34,6 +34,8 @@ def unit(session: nox.Session) -> None:
 def coverage(session: nox.Session) -> None:
     """Generate coverage report."""
     session.install("coverage[toml]")
+    # Combine coverage data and apply path mappings
+    session.run("coverage", "combine", "--keep", success_codes=[0, 1])
     if session.posargs and session.posargs[0] == "xml":
         session.run("coverage", "xml")
     else:

pyproject.toml

@@ -213,6 +213,12 @@ omit = [
     "*/__pycache__/*",
 ]
 
+[tool.coverage.paths]
+source = [
+    "src/",
+    ".nox/*/lib/python*/site-packages/",
+]
+
 [tool.coverage.report]
 exclude_lines = [
     "pragma: no cover",