specify php version, added tests workflow, fixed tests on php 8.1

.github/workflows/test.yaml

@@ -0,0 +1,45 @@
+name: Tests
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version: [ '8.1', '8.2' ]
+
+    name: Run tests on PHP v${{ matrix.php-version }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          extensions: pcntl
+
+      - name: Set composer cache directory
+        id: composer-cache
+        run: echo "COMPOSER_CACHE_DIRECTORY=$(composer config cache-files-dir)" >> $GITHUB_ENV
+
+      - name: Restore composer from cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.COMPOSER_CACHE_DIRECTORY }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer dependencies
+        run: composer install --no-interaction --prefer-dist --no-progress
+
+      - name: Run phpunit tests
+        run: vendor/bin/phpunit --colors=always --testdox

composer.json

@@ -19,6 +19,9 @@
             "Aternos\\Taskmaster\\Test\\": "test/"
         }
     },
+    "require": {
+        "php": ">=8.1"
+    },
     "require-dev": {
         "phpunit/phpunit": "^10.4"
     },

test/Task/SynchronizedFieldTask.php

@@ -32,13 +32,12 @@ public function increaseCounter(): void
      * @throws Throwable
      */
     #[OnChild]
-    public function run(): null
+    public function run(): void
     {
         for ($i = 0; $i < $this->amount; $i++) {
             $this->increaseCounter();
             $this->call($this->increaseCounter(...));
         }
-        return null;
     }
 
     /**