python tests. (#24)

.github/workflows/ci.yml

@@ -98,4 +98,36 @@ jobs:
           cargo bench
           git checkout ${{ github.head_ref }}
           cargo bench
-        shell: bash -lxeu {0}
+        shell: bash -lxeu {0}
+
+  python-tests:
+    name: Python tests (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.9]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 'stable'
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Build wheel
+        run: |
+          pip install --upgrade maturin
+          maturin build --release -m biosphere-py/Cargo.toml
+      - name: Install wheel
+        run: |
+          pip install numpy pytest
+          pip install --force-reinstall --no-index --find-links biosphere-py/target/wheels/ biosphere
+      - name: Run tests
+        run: pytest biosphere-py/tests