diff --git a/.github/workflows/code_changes.yaml b/.github/workflows/code_changes.yaml
index 2bd433a49..21c6815b1 100644
--- a/.github/workflows/code_changes.yaml
+++ b/.github/workflows/code_changes.yaml
@@ -46,7 +46,13 @@ jobs:
             run: uv pip install policyengine --system
           - name: UV sync
             run: uv sync
-          - name: Run tests
+          - name: Run tests with coverage
             run: make test
             env:
               HUGGING_FACE_TOKEN: ${{ secrets.HUGGING_FACE_TOKEN }}
+          - name: Upload coverage to Codecov
+            uses: codecov/codecov-action@v3
+            with:
+              file: ./coverage.xml
+              fail_ci_if_error: false
+              verbose: true
diff --git a/.github/workflows/pr_code_changes.yaml b/.github/workflows/pr_code_changes.yaml
index e63a4d908..ffac44323 100644
--- a/.github/workflows/pr_code_changes.yaml
+++ b/.github/workflows/pr_code_changes.yaml
@@ -46,9 +46,15 @@ jobs:
             run: uv pip install policyengine --system
           - name: UV sync
             run: uv sync
-          - name: Run tests
+          - name: Run tests with coverage
             run: make test
             env:
               HUGGING_FACE_TOKEN: ${{ secrets.HUGGING_FACE_TOKEN }}
+          - name: Upload coverage to Codecov
+            uses: codecov/codecov-action@v3
+            with:
+              file: ./coverage.xml
+              fail_ci_if_error: false
+              verbose: true
           - name: Test documentation builds
             run: make documentation
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index faa5fb1d7..ee7a5016f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,28 @@ policyengine_uk/calibration/*.h5
 *.ipynb
 !docs/**/*.ipynb
 !uprating_growth_factors.csv
+
+# Virtual environments
+.venv/
+venv/
+env/
+ENV/
+.env
+env.bak/
+venv.bak/
+.env*
+
+# Coverage / testing
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
diff --git a/Makefile b/Makefile
index 5373978b8..33ddf37ab 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ format:
 
 test:
 	policyengine-core test policyengine_uk/tests/policy -c policyengine_uk
-	pytest policyengine_uk/tests/ -v
+	pytest policyengine_uk/tests/ --cov=policyengine_uk --cov-report=xml --maxfail=0 -v
 
 update-tests:
 	python policyengine_uk/data/economic_assumptions.py
diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb..60f5f8ea2 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,5 @@
+- bump: minor
+  changes:
+    added:
+    - Codecov coverage.
+    - Expanded .gitignore.
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index cc11300e8..f4ce4a955 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,6 +63,7 @@ dev = [
     "furo<2023",
     "tqdm",
     "pytest",
+    "pytest-cov",
     "setuptools",
     "sphinx-argparse>=0.3.2,<1",
     "sphinx-math-dollar>=1.2.1,<2",