diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..8ed46e5
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,15 @@
+FROM php:8.4-cli
+
+# zip: ZipArchive in JSignPdfRuntimeService | sockets: donatj/mock-webserver in the tests
+ADD https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
+RUN chmod uga+x /usr/local/bin/install-php-extensions && sync \
+ && install-php-extensions \
+    sockets \
+    zip \
+    @composer \
+ && rm /usr/local/bin/install-php-extensions
+
+# PharData exceeds the default 128M just to open the JRE tarball
+RUN echo 'memory_limit=512M' > /usr/local/etc/php/conf.d/app.ini
+
+WORKDIR /app
diff --git a/README.md b/README.md
index 68dc638..76338a9 100644
--- a/README.md
+++ b/README.md
@@ -64,5 +64,31 @@ Change parameters of JSignPDF:
 $param->setJSignParameters("-a -kst PKCS12 -ts https://freetsa.org/tsr");
 ```
 
+## Docker Environment
+
+The repository ships a minimal Docker setup (`Dockerfile` and `compose.yml`) with the extensions
+the test suite needs.
+
+```bash
+docker compose build
+docker compose run --rm php composer install
+```
+
+Checks, the same ones the CI runs:
+
+```bash
+docker compose run --rm php composer run test:unit
+docker compose run --rm php composer run cs:check   # cs:fix to apply the formatting
+docker compose run --rm php composer run psalm
+```
+
+### Usage example
+
+To sign a PDF end to end. It downloads the JRE and the JSignPdf jar into `tmp/` on the first run:
+
+```bash
+docker compose run --rm php php example/index.php
+```
+
 ## Credits
 - [Jeidison Farias](https://github.com/jeidison)
diff --git a/compose.yml b/compose.yml
new file mode 100644
index 0000000..82c0200
--- /dev/null
+++ b/compose.yml
@@ -0,0 +1,9 @@
+services:
+  php:
+    build: .
+    # export HOST_UID/HOST_GID if yours are not 1000, so the files it writes are yours (see: id -u; id -g)
+    user: "${HOST_UID:-1000}:${HOST_GID:-1000}"
+    environment:
+      COMPOSER_HOME: ${COMPOSER_HOME:-/tmp/composer}
+    volumes:
+      - .:/app
diff --git a/tests/Runtime/JavaRuntimeServiceTest.php b/tests/Runtime/JavaRuntimeServiceTest.php
index 8f16ba0..a86e88f 100644
--- a/tests/Runtime/JavaRuntimeServiceTest.php
+++ b/tests/Runtime/JavaRuntimeServiceTest.php
@@ -170,6 +170,7 @@ public function testGetPathWithDownloadUrlWithInvalidVersion(): void
         $baseUrl = $server->getServerRoot();
         $url = $baseUrl . '/OpenJDK21U-jre_x64_linux_hotspot_21.0.8_9.tar.gz';
         $jsignParam->setJavaDownloadUrl($url);
+        $jsignParam->setJavaPath($this->testTmpDir . '/bin/java');
 
         $this->expectException(InvalidArgumentException::class);
         $this->expectExceptionMessageMatches('/cannot be extracted/');