diff --git a/.github/workflows/python_test.yml b/.github/workflows/python_test.yml
new file mode 100644
index 0000000..5e5f722
--- /dev/null
+++ b/.github/workflows/python_test.yml
@@ -0,0 +1,42 @@
+name: Pytest
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+
+jobs:
+  uv-test:
+    name: python
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version:
+          - "3.10"
+          - "3.11"
+          - "3.12"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+        with:
+          # Install a specific version of uv.
+          version: "0.5.1"
+          enable-cache: true
+          cache-dependency-glob: "uv.lock"
+
+      - name: Setup Python ${{ matrix.python-version }}
+        run: uv python install ${{ matrix.python-version }}
+
+      - name: Install the project
+        run: uv sync --all-extras --dev
+
+      - name: Run tests
+        run: uv run pytest
diff --git a/.gitignore b/.gitignore
index a007fea..90ab317 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,9 @@
 build/*
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+# venv
+.venv
diff --git a/src/cytnx_core/__init__.py b/src/cytnx_core/__init__.py
index b146483..e581d39 100644
--- a/src/cytnx_core/__init__.py
+++ b/src/cytnx_core/__init__.py
@@ -1,4 +1,4 @@
-from test_build._core import hello_from_bin
+from cytnx_core._core import hello_from_bin
 
 
 def hello() -> str:
diff --git a/src/cytnx_core/__pycache__/__init__.cpython-312.pyc b/src/cytnx_core/__pycache__/__init__.cpython-312.pyc
new file mode 100644
index 0000000..4816ad3
Binary files /dev/null and b/src/cytnx_core/__pycache__/__init__.cpython-312.pyc differ
diff --git a/test/__pycache__/test_simple.cpython-312-pytest-8.3.3.pyc b/test/__pycache__/test_simple.cpython-312-pytest-8.3.3.pyc
new file mode 100644
index 0000000..0e269c9
Binary files /dev/null and b/test/__pycache__/test_simple.cpython-312-pytest-8.3.3.pyc differ
diff --git a/test/test_simple.py b/test/test_simple.py
new file mode 100644
index 0000000..25e4163
--- /dev/null
+++ b/test/test_simple.py
@@ -0,0 +1,5 @@
+from cytnx_core import hello
+
+
+def test_str():
+    assert isinstance(hello(), str)