chore: support pytest-cov and local reporting (#2179)

Author: stevenh

pyproject.toml

@@ -224,6 +224,20 @@ omit = [
     "pydantic_ai_slim/pydantic_ai/ext/aci.py", # aci-sdk requires Python 3.10+ so cannot be added as an (optional) dependency
 ]
 branch = true
+# Disable include-ignored warnings as --source is enabled automatically causing a self conflict as per:
+# https://github.com/pytest-dev/pytest-cov/issues/532
+# https://github.com/pytest-dev/pytest-cov/issues/369
+# This prevents coverage being generated by pytest-cov which has direct editor support in VS Code,
+# making it super useful to check coverage while writing tests.
+disable_warnings = ["include-ignored"]
+
+[tool.coverage.paths]
+# Allow CI run assets to be downloaded an replicated locally.
+source = [
+    ".",
+    "/home/runner/work/pydantic-ai/pydantic-ai",
+    "/System/Volumes/Data/home/runner/work/pydantic-ai/pydantic-ai"
+]
 
 # https://coverage.readthedocs.io/en/latest/config.html#report
 [tool.coverage.report]