Run browser mode tests in Docker with authentication instead of Electron (#972)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasnordquist <7721625+thomasnordquist@users.noreply.github.com>
Co-authored-by: Thomas Nordquist <thomasnordquist@users.noreply.github.com>

scripts/runBrowserTests.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+# Browser Mode Test Runner
+# 
+# This script runs UI tests against the browser mode server (instead of Electron).
+# It starts a local mosquitto MQTT broker and the MQTT Explorer server, then runs
+# the test suite using Playwright with a headless Chrome browser.
+#
+# Environment Variables:
+#   MQTT_EXPLORER_USERNAME - Username for browser authentication (default: test)
+#   MQTT_EXPLORER_PASSWORD - Password for browser authentication (default: test123)
+#   PORT - Server port (default: 3000)
+#   BROWSER_MODE_URL - URL for browser tests (set automatically)
+#   MQTT_BROKER_HOST - MQTT broker host for tests (default: 127.0.0.1)
+#   MQTT_BROKER_PORT - MQTT broker port for tests (default: 1883)
+#
+set -e
+
+function finish {
+  set +e
+  echo "Exiting, cleaning up.."
+
+  if [[ ! -z "$PID_MOSQUITTO" ]]; then
+    echo "Stopping mosquitto ($PID_MOSQUITTO).."
+    kill "$PID_MOSQUITTO" || echo "Already stopped"
+  fi
+
+  if [[ ! -z "$PID_SERVER" ]]; then
+    echo "Stopping server ($PID_SERVER).."
+    kill "$PID_SERVER" || echo "Already stopped"
+  fi
+}
+
+trap finish EXIT
+
+# Start mqtt broker
+mosquitto &
+export PID_MOSQUITTO=$!
+sleep 1
+
+# Set credentials for browser authentication (tests will use these to login)
+export MQTT_EXPLORER_USERNAME=${MQTT_EXPLORER_USERNAME:-test}
+export MQTT_EXPLORER_PASSWORD=${MQTT_EXPLORER_PASSWORD:-test123}
+export PORT=${PORT:-3000}
+
+# Start the browser mode server
+node dist/src/server.js &
+export PID_SERVER=$!
+
+# Wait for server to be ready (max 60 seconds)
+echo "Waiting for server to start..."
+for i in {1..60}; do
+  if curl -f --connect-timeout 5 --max-time 10 http://localhost:${PORT} > /dev/null 2>&1; then
+    echo "Server started successfully after $i seconds"
+    break
+  fi
+  if [ $i -eq 60 ]; then
+    echo "Server failed to start within 60 seconds"
+    exit 1
+  fi
+  sleep 1
+done
+
+# Run browser tests
+export BROWSER_MODE_URL="http://localhost:${PORT}"
+export MQTT_BROKER_HOST="127.0.0.1"
+export MQTT_BROKER_PORT="1883"
+
+yarn test:browser
+TEST_EXIT_CODE=$?
+
+echo "Browser tests exited with $TEST_EXIT_CODE"
+exit $TEST_EXIT_CODE