Run server on different port when running tests

package.json

@@ -10,6 +10,7 @@
     "svg-pan-zoom": "github:webdevcat-me/svg-pan-zoom"
   },
   "scripts": {
+    "start": "node dev-server.cjs",
     "test:integ": "jest --config jest.config.integ.cjs",
     "test": "jest"
   }