chore: add pytest code coverage report

.gitignore

@@ -17,6 +17,7 @@ gha-creds-*.json
 .env
 .ruff_cache
 .pytest_cache
+.coverage
 .nox
 *.log
 */file::memory:?cache=shared

noxfile.py

@@ -72,7 +72,7 @@ def tests(session, shard):
     if shard == "llamaindex":
         session.posargs.insert(0, "-n4")
 
-    session.run("pytest", *session.posargs, *test_dirs, env=env)
+    session.run("pytest", "--cov=weave", "--cov-report=html", "--cov-branch", *session.posargs, *test_dirs, env=env)
 
 
 # Configure pytest

pyproject.toml

@@ -72,6 +72,7 @@ test = [
   "nox",
   "pytest>=8.2.0",
   "pytest-asyncio>=0.23.6",
+  "pytest-cov>=5.0.0",
   "pytest-xdist>=3.1.0",
   "pytest-rerunfailures>=12.0",
   "clickhouse_connect==0.7.0",