diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
new file mode 100644
index 0000000..ef34f6a
--- /dev/null
+++ b/.github/workflows/CI.yml
@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: 'Build and test fjsplib using ${{ matrix.python-version }}'
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ['3.9', '3.12']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Update pip and poetry
+        run: |
+          python -m pip install --upgrade pip
+          pip install poetry
+      - name: Cache Python dependencies
+        uses: actions/cache@v4
+        id: cache-python
+        with:
+          path: ~/.cache/pypoetry
+          key: ${{ runner.os }}-python-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml') }}
+      - name: Install Python dependencies
+        if: steps.cache-python.outputs.cache-hit != 'true'
+        run: poetry install
+      - name: Cache pre-commit
+        uses: actions/cache@v4
+        id: cache-pre-commit
+        with:
+          path: ~/.cache/pre-commit/
+          key: pre-commit-${{ env.pythonLocation }}-${{ hashFiles('.pre-commit-config.yaml') }}
+      - name: Install pre-commit
+        if: steps.cache-pre-commit.outputs.cache-hit != 'true'
+        run: poetry run pre-commit install --install-hooks
+      - name: Run pre-commit
+        run: poetry run pre-commit run --all-files
+      - name: Run tests
+        run: poetry run pytest
+      - if: matrix.python-version == '3.9'
+        name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4.0.1
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+          slug: leonlan/FJSPLIB
diff --git a/README.md b/README.md
index 6417a27..1182589 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
 # FJSPLIB
+![PyPI](https://img.shields.io/pypi/v/FJSPLIB?style=flat-square)
+![License](https://img.shields.io/pypi/l/FJSPLIB?style=flat-square)
+![CI](https://img.shields.io/github/actions/workflow/status/leonlan/FJSPLIB/.github%2Fworkflows%2FCI.yml?style=flat-square)
+![Codecov](https://img.shields.io/codecov/c/github/leonlan/FJSPLIB?style=flat-square)
 
 FJSPLIB is a Python package for reading and writing flexible job shop problem (FJSP) instances.
diff --git a/fjsplib/read.py b/fjsplib/read.py
index 1ef4b35..be52135 100644
--- a/fjsplib/read.py
+++ b/fjsplib/read.py
@@ -1,5 +1,6 @@
 from dataclasses import dataclass
 from pathlib import Path
+from typing import Union
 
 ProcessingData = list[tuple[int, int]]
 Arc = tuple[int, int]
@@ -115,7 +116,7 @@ def read(loc: Path) -> Instance:
     )
 
 
-def file2lines(loc: Path | str) -> list[list[int]]:
+def file2lines(loc: Union[Path, str]) -> list[list[int]]:
     with open(loc, "r") as fh:
         lines = [line for line in fh.readlines() if line.strip()]
 
diff --git a/pyproject.toml b/pyproject.toml
index fdb7af6..7f24a57 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,20 +11,23 @@ repository = "https://github.com/leonlan/FJSPLIB"
 python = "^3.9"
 numpy = "^1.26.4"
 
-
 [tool.poetry.group.dev.dependencies]
-pytest = "^7.1.2"
 pre-commit = "^2.19.0"
+pytest = "^7.1.2"
+pytest-cov = ">=2.6.1"
 
 
 [tool.black]
 line-length = 79
 
 
+[tool.mypy]
+ignore_missing_imports = true
+
+
 [tool.ruff]
 line-length = 79
 
-
 [tool.ruff.lint]
 ignore-init-module-imports = true
 select = [
@@ -36,8 +39,9 @@ case-sensitive = true
 known-first-party = ["fjsplib", "tests"]
 
 
-[tool.mypy]
-ignore_missing_imports = true
+[tool.pytest.ini_options]
+addopts = "--cov=. --cov-report=xml --cov-report=term"
+testpaths = "tests"
 
 
 [build-system]