Resolve "Optimize waiting time for starting e2e tests"

Closes #647 (closed)

scripts/run_e2e-tests.sh

+#!/usr/bin/env bash
+
+# Inspired from https://stackoverflow.com/a/25042323/5300212
+# How to run e2e test after serving the app
+
+# Start the web app
+npm start &
+NG_SERVE_PID=$!
+
+echo "**************************************************************************"
+echo "Just in case... Use kill -9 -${NG_SERVE_PID} to kill the server if something goes wrong"
+echo "**************************************************************************"
+
+# Wait for http response 200 on port 4200
+response=0
+while [ "$response" != "200" ]; do
+    response=$(curl --write-out '%{http_code}' --silent --output /dev/null 127.0.0.1:4200 || echo 0)
+    sleep 5;
+done
+
+# Run wdio
+npm run e2equick
+
+# Cleanup daemon processes
+kill -9 -$NG_SERVE_PID