chore: implement basic tests

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

.github/workflows/php-unit-tests.yml

@@ -0,0 +1,24 @@
+name: PHP Unit Tests
+
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6.0.2
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1
+        with:
+          php-version: '8.5'
+          tools: composer:v2
+          extensions: ctype, iconv, mongodb
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Run tests
+        run: composer test:unit