diff --git a/.gitignore b/.gitignore
index 8b0cffa54e7..bfd2c66ffcc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,6 +17,7 @@ gha-creds-*.json
 .env
 .ruff_cache
 .pytest_cache
+.coverage
 .nox
 *.log
 */file::memory:?cache=shared
diff --git a/noxfile.py b/noxfile.py
index 1f0817f4cfe..38552a9c36f 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -72,7 +72,15 @@ 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
diff --git a/pyproject.toml b/pyproject.toml
index bfe44c21cab..605ceabb8ed 100644
--- a/pyproject.toml
+++ b/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",