3 files changed, 57 insertions, 0 deletions
diff --git a/composer.json b/composer.json
index 07e888d..001780a 100644
--- a/composer.json
+++ b/composer.json
@@ -24,5 +24,14 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^12"
+    },
+    "scripts": {
+        "test": "phpunit",
+        "matrix": [
+            "COMPOSER_FLAGS=--prefer-lowest docker compose run --rm php84",
+            "COMPOSER_FLAGS=--prefer-stable docker compose run --rm php84",
+            "COMPOSER_FLAGS=--prefer-lowest docker compose run --rm php85",
+            "COMPOSER_FLAGS=--prefer-stable docker compose run --rm php85"
+        ]
     }
 }
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..4a8aea4
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,20 @@
+x-test: &test
+  environment:
+    - COMPOSER_FLAGS=${COMPOSER_FLAGS:-}
+  volumes:
+    - .:/app:ro
+    - composer-cache:/root/.composer
+  working_dir: /app
+  command: sh scripts/test.sh
+
+services:
+  php84:
+    <<: *test
+    image: php:8.4-cli-alpine
+
+  php85:
+    <<: *test
+    image: php:8.5-cli-alpine
+
+volumes:
+  composer-cache:
diff --git a/scripts/test.sh b/scripts/test.sh
new file mode 100755
index 0000000..70554be
--- /dev/null
+++ b/scripts/test.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+set -e
+
+COMPOSER_PHAR="/root/.composer/composer.phar"
+WORKDIR="/tmp/app"
+
+# Copy project to isolated working directory
+rm -rf "$WORKDIR"
+cp -r /app "$WORKDIR"
+cd "$WORKDIR"
+
+# Remove lock file and vendor for fresh install
+rm -f composer.lock
+rm -rf vendor/
+
+# Download Composer if not cached
+if [ ! -f "$COMPOSER_PHAR" ]; then
+    echo "Downloading Composer..."
+    mkdir -p /root/.composer
+    curl -sS https://getcomposer.org/installer | php -- --install-dir=/root/.composer --filename=composer.phar
+fi
+
+# Install dependencies
+echo "COMPOSER_FLAGS: ${COMPOSER_FLAGS:-<empty>}"
+php "$COMPOSER_PHAR" update --no-interaction ${COMPOSER_FLAGS:-}
+
+# Run tests
+php "$COMPOSER_PHAR" test