add test

.github/workflows/test.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+    - uses: actions/setup-python@v5.1.0
+      with:
+        python-version: "3.9"
+
+    - uses: actions/checkout@v4
+
+    - name: Install 
+      run: |
+        pip install pytest
+
+    - name: Run tests
+      run: |
+        pytest