ui tests: get reliable service url inside containers network

msa/black-box-tests/src/test/java/org/thingsboard/server/msa/TestProperties.java

@@ -16,6 +16,7 @@
 package org.thingsboard.server.msa;
 
 import lombok.extern.slf4j.Slf4j;
+import org.testcontainers.DockerClientFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -41,7 +42,9 @@ public class TestProperties {
 
     public static String getBaseUiUrl() {
         if (instance.isActive()) {
-            return "https://host.docker.internal";
+            //return "https://host.docker.internal" // this alternative requires docker-selenium.yml extra_hosts: - "host.docker.internal:host-gateway"
+            //return "https://" + DockerClientFactory.instance().dockerHostIpAddress(); //this alternative will get Docker IP from testcontainers
+            return "https://haproxy"; //communicate inside current docker-compose network to the load balancer container
         }
         return getProperties().getProperty("tb.baseUiUrl");
     }

msa/black-box-tests/src/test/resources/docker-selenium.yml

@@ -31,5 +31,6 @@ services:
       SE_SCREEN_HEIGHT: 1080
       SE_SCREEN_DEPTH: 24
       SE_SCREEN_DPI: 74
-    extra_hosts:
-      - "host.docker.internal:host-gateway"
+# Alternative way how to connect to the host address
+#    extra_hosts:
+#      - "host.docker.internal:host-gateway"