Added GitHub workflow for tests

Author: WalterWoshid

.github/workflows/tests.yml

@@ -0,0 +1,56 @@
+name: PHP Tests
+
+on:
+  push:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  run:
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      matrix:
+        operating-system: [ ubuntu-latest ]
+        php-version: [ '8.0', '8.1', '8.2' ]
+
+    name: PHP ${{ matrix.php-version }} test on ${{ matrix.operating-system }}
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      - name: Install PHP
+        id: php
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+
+      - name: Check PHP version
+        run: php -v
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: ${{ runner.os }}-${{ matrix.operating-system }}-php-${{ steps.php.outputs.php-version }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.operating-system }}-php-${{ steps.php.outputs.php-version }}
+
+      - if: steps.composer-cache.outputs.cache-hit != 'true'
+        name: Install Composer dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: PHPUnit Tests
+        run: vendor/bin/phpunit --coverage-clover ./tests/coverage.xml
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./tests/coverage.xml
+          flags: os-${{ matrix.operating-system }}_php-${{ matrix.php-version }}
+          verbose: true