Added testing

Dockerfile

@@ -0,0 +1,22 @@
+FROM composer:lts as deps
+WORKDIR /app
+RUN --mount=type=bind,source=./composer.json,target=composer.json \
+    --mount=type=bind,source=./composer.lock,target=composer.lock \
+    --mount=type=cache,target=/tmp/cache \
+    composer install --no-interaction
+
+FROM php:8-cli as base
+WORKDIR /app
+RUN apt-get update &&  \
+    apt-get install -yq --no-install-recommends libsqlite3-dev &&  \
+    rm -rf /var/lib/apt/lists/* &&  \
+    docker-php-ext-install pdo pdo_sqlite
+COPY ./src /app/src
+
+FROM base as dev
+COPY ./tests /app/tests
+RUN mv "$PHP_INI_DIR/php.ini-development" "$PHP_INI_DIR/php.ini"
+COPY --from=deps /app/vendor/ /app/vendor
+
+FROM dev as test
+ENTRYPOINT [ "./vendor/bin/phpunit" ]