Create test-pytest.yml

added github action script for testing

.github/workflows/test-pytest.yml

@@ -0,0 +1,26 @@
+name: Test with py.test
+
+on:
+  pull_request:
+  merge_group:
+  push:
+    branches:
+      - main
+
+
+jobs:
+  test:
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: "pip"
+    - run: pip install ".[test]"
+    - run: pytest --doctest-modules