Add integration tests

docker-compose.test.yml

@@ -0,0 +1,32 @@
+services:
+  vol1:
+    image: nginx:alpine
+    volumes:
+      - ./tests/nginx.conf:/etc/nginx/conf.d/default.conf
+      - vol1_data:/data
+    ports:
+      - "3101:80"
+    entrypoint: ["/bin/sh", "-c", "chown nginx:nginx /data && exec nginx -g 'daemon off;'"]
+
+  vol2:
+    image: nginx:alpine
+    volumes:
+      - ./tests/nginx.conf:/etc/nginx/conf.d/default.conf
+      - vol2_data:/data
+    ports:
+      - "3102:80"
+    entrypoint: ["/bin/sh", "-c", "chown nginx:nginx /data && exec nginx -g 'daemon off;'"]
+
+  vol3:
+    image: nginx:alpine
+    volumes:
+      - ./tests/nginx.conf:/etc/nginx/conf.d/default.conf
+      - vol3_data:/data
+    ports:
+      - "3103:80"
+    entrypoint: ["/bin/sh", "-c", "chown nginx:nginx /data && exec nginx -g 'daemon off;'"]
+
+volumes:
+  vol1_data:
+  vol2_data:
+  vol3_data: