Add a test for building pyo3 Python extension

Author: rominf

.github/workflows/e2e-extension.yml

@@ -39,3 +39,29 @@ jobs:
       - name: Run C extension
         run: |
           ${{ steps.setup-python.outputs.python-path }} -c "import helloworld; helloworld.say_hello('world')"
+  python-pyo3-extension:
+    name: Test building pyo3 extension (Python ${{ matrix.python-version}}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ['3.9', 'pypy-3.9-v7.x']
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Python
+        id: setup-python
+        uses: ./
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+      - name: Build pyo3 extension
+        uses: PyO3/maturin-action@v1
+        with:
+          args: --release --interpreter 'python3.9 pypy3.9'
+          working-directory: __tests__/data/pyo3_extension/
+      - name: Install pyo3 extension
+        run: pip install --no-index --find-links __tests__/data/pyo3_extension/target/wheels/ helloworld
+      - name: Run pyo3 extension
+        run: |
+          ${{ steps.setup-python.outputs.python-path }} -c "import helloworld; helloworld.say_hello('world')"

__tests__/data/pyo3_extension/Cargo.lock

@@ -0,0 +1,12 @@
+[package]
+name = "helloworld"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+name = "helloworld"
+crate-type = ["cdylib"]
+
+[dependencies.pyo3]
+version = "0.21.1"

__tests__/data/pyo3_extension/Cargo.toml

@@ -0,0 +1,16 @@
+[build-system]
+requires = ["maturin>=1.6,<2.0"]
+build-backend = "maturin"
+
+[project]
+name = "helloworld"
+requires-python = ">=3.8"
+classifiers = [
+    "Programming Language :: Rust",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+]
+dynamic = ["version"]
+
+[tool.maturin]
+features = ["pyo3/extension-module"]

__tests__/data/pyo3_extension/pyproject.toml

@@ -0,0 +1,12 @@
+use pyo3::prelude::*;
+
+#[pyfunction]
+fn say_hello(s: &str) {
+    println!("Hello, {}!", s);
+}
+
+#[pymodule]
+fn helloworld(m: &Bound<'_, PyModule>) -> PyResult<()> {
+    m.add_function(wrap_pyfunction!(say_hello, m)?)?;
+    Ok(())
+}