diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7b8257a..5dfe3ed 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,8 +28,8 @@ jobs:
         # works without a Flower install.
         run: |
           python -m pip install --upgrade pip
-          pip install pytest "rocrate>=0.13" "tomli>=2.0; python_version < '3.11'"
+          pip install pytest pytest-cov "rocrate>=0.13" "tomli>=2.0; python_version < '3.11'"
           pip install -e . --no-deps
 
-      - name: Run tests
-        run: pytest -q
+      - name: Run tests with coverage
+        run: pytest -q --cov=flwrcrate --cov-report=term-missing --cov-fail-under=85
diff --git a/.gitignore b/.gitignore
index 069a5b7..3d22253 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,5 +10,11 @@ dist/
 fl_crate_out/
 *.tmp
 
+# Test / coverage artifacts
+.coverage
+.coverage.*
+.pytest_cache/
+htmlcov/
+
 # macOS
 .DS_Store
diff --git a/README.md b/README.md
index 20b37c9..f4bd085 100644
--- a/README.md
+++ b/README.md
@@ -259,15 +259,17 @@ it produced.
 ## Development
 
 ```bash
-pip install -e ".[dev]"   # installs pytest
-pytest                    # run the full unit + integration suite
+pip install -e ".[dev]"                      # installs pytest + pytest-cov
+pytest                                        # run the full unit + integration suite
+pytest --cov=flwrcrate --cov-report=term-missing   # with a coverage report
 ```
 
 The suite is split into fast **unit** tests (dependency parsing, metric
 handling, slug/person helpers, crate assembly) and **integration** tests that
 drive the whole `FLCrateTracker` lifecycle and assert a complete, correct
 `ro-crate-metadata.json` — without needing Flower, Ray, or any ML framework
-installed. CI runs it on Python 3.10–3.12 (see the badge above).
+installed. CI runs it on Python 3.10–3.12 (see the badge above) and enforces a
+minimum coverage of 85% (currently ~92%).
 
 ## License
 
diff --git a/pyproject.toml b/pyproject.toml
index 92a4411..f2fd4ea 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,10 +16,13 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-dev = ["pytest>=7.0"]
+dev = ["pytest>=7.0", "pytest-cov>=4.0"]
 
 [tool.hatch.build.targets.wheel]
 packages = ["flwrcrate"]
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]
+
+[tool.coverage.run]
+source = ["flwrcrate"]