diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..2f802c6
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,22 @@
+name: Test my project
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["pypy3.10", "3.9", "3.10", "3.11", "3.12", "3.13"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      # You can test your matrix by printing the current Python version
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
+
diff --git a/pyproject.toml b/pyproject.toml
index 66ce77b..0f781f5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,3 +12,7 @@ packages = ["science_project"]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}
+
+[tool.pytest]
+python_files = "test_*.py"
+testpaths = ["science_project/tests"]
diff --git a/science_project/__init__.py b/science_project/__init__.py
index e69de29..aaab658 100644
--- a/science_project/__init__.py
+++ b/science_project/__init__.py
@@ -0,0 +1 @@
+from .main import add_one
diff --git a/science_project/main.py b/science_project/main.py
new file mode 100644
index 0000000..c929f88
--- /dev/null
+++ b/science_project/main.py
@@ -0,0 +1,2 @@
+def add_one(number):
+    return number + 1
diff --git a/science_project/tests/__init__.py b/science_project/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/science_project/tests/test_project.py b/science_project/tests/test_project.py
new file mode 100644
index 0000000..374b50f
--- /dev/null
+++ b/science_project/tests/test_project.py
@@ -0,0 +1,7 @@
+import pytest
+from .. import add_one
+
+
+@pytest.mark.parametrize("x, y", [(1, 2), (2, 3), (3, 4)])
+def test_add_one(x, y):
+    assert y == add_one(x)