adds ci workflow for automated testing

Sets up a GitHub Actions workflow to run tests
on push and pull requests to the main branch.

The workflow uses multiple Python versions to
ensure compatibility across different environments.

Author: hellobertrand

.github/workflows/test.yml

@@ -0,0 +1,24 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - run: python -m pip install --upgrade pip
+      - run: python -m unittest discover tests

src/screenshotmax/tests/test_client.py tests/test_client.pysrc/screenshotmax/tests/test_client.py renamed to tests/test_client.py

@@ -0,0 +1,20 @@
+# test_options.py
+import unittest
+from screenshotmax.options import ScreenshotOptions
+from screenshotmax.enums import ImageFormat
+
+class TestScreenshotOptions(unittest.TestCase):
+  def test_to_dict_includes_only_non_none_values(self):
+    options = ScreenshotOptions(
+      url="https://example.com",
+      format=ImageFormat.PNG,
+      full_page=True
+    )
+    data = options.to_dict()
+    self.assertEqual(data["url"], "https://example.com")
+    self.assertEqual(data["format"], "png")
+    self.assertEqual(data["full_page"], True)
+    self.assertNotIn("viewport_device", data)
+
+if __name__ == "__main__":
+  unittest.main()