ci: Run tests on every pull request across PHP 7.1 to 8.4

.github/workflows/test.yml

@@ -0,0 +1,49 @@
+name: Tests
+
+on:
+    pull_request:
+    workflow_dispatch:
+
+jobs:
+    phpunit:
+        name: PHPUnit (PHP ${{ matrix.php }})
+        runs-on: ubuntu-latest
+        strategy:
+            fail-fast: false
+            matrix:
+                php: [ '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v4
+
+            -   name: Setup PHP ${{ matrix.php }}
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    tools: composer:v2
+                    coverage: none
+
+            # phpbench (benchmarks only) does not support the oldest PHP versions
+            -   name: Remove benchmark dependency
+                run: composer remove --dev phpbench/phpbench --no-update --no-interaction
+
+            -   name: Install dependencies
+                run: composer update --prefer-dist --no-progress --no-interaction
+
+            -   name: Lint
+                run: find src tests/unit -name '*.php' -print0 | xargs -0 -n1 php -l
+
+            -   name: Run tests
+                run: composer test
+
+    traits:
+        name: Generated traits are up to date
+        runs-on: ubuntu-latest
+
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v4
+
+            -   name: Check traits
+                run: python3 tools/generate-traits.py --check

composer.json

@@ -21,7 +21,7 @@
         "phpbench/phpbench": "^1.0",
         "ext-libxml": "*",
         "ext-simplexml": "*",
-        "phpunit/phpunit": "^7.5 || ^9.5"
+        "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5"
     },
     "license": "MIT",
     "version": "4.2.0",