ci: test on php 8.4

.github/workflows/ci.yml

@@ -0,0 +1,70 @@
+name: "CI"
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  phpunit:
+    name: "PHPUnit"
+    runs-on: "ubuntu-22.04"
+
+    strategy:
+      matrix:
+        php-version:
+          - "8.1"
+          - "8.2"
+          - "8.3"
+          - "8.4"
+        dependencies:
+          - "highest"
+        include:
+          - dependencies: "lowest"
+            php-version: "8.1"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+        with:
+          fetch-depth: 2
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "${{ matrix.php-version }}"
+          coverage: "pcov"
+          ini-values: "zend.assertions=1"
+
+      - name: "Install dependencies with Composer"
+        uses: "ramsey/composer-install@v2"
+        with:
+          dependency-versions: "${{ matrix.dependencies }}"
+
+      - name: "Run PHPUnit"
+        run: "vendor/bin/phpunit --coverage-clover=coverage.xml"
+
+      - name: "Upload coverage file"
+        uses: "actions/upload-artifact@v4"
+        with:
+          name: "phpunit-${{ matrix.dependencies }}-${{ matrix.php-version }}.coverage"
+          path: "coverage.xml"
+
+  upload_coverage:
+    name: "Upload coverage to Coveralls"
+    runs-on: "ubuntu-22.04"
+    needs:
+      - "phpunit"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+        with:
+          fetch-depth: 2
+
+      - name: "Download coverage files"
+        uses: "actions/download-artifact@v4"
+        with:
+          path: "reports"
+
+      - name: "Upload to Coveralls"
+        uses: coverallsapp/github-action@v2

composer.json

@@ -14,8 +14,7 @@
         "ext-bcmath": "*"
     },
     "require-dev": {
-        "php-coveralls/php-coveralls": "^2.5",
-        "phpunit/phpunit": "^9.0"
+        "phpunit/phpunit": "^9.6"
     },
     "autoload": {
         "psr-4": {