New configRoundtrip method for Cloud configuration

src/main/java/org/jvnet/hudson/test/JenkinsRule.java

@@ -105,6 +105,7 @@
 import hudson.security.AbstractPasswordBasedSecurityRealm;
 import hudson.security.GroupDetails;
 import hudson.security.csrf.CrumbIssuer;
+import hudson.slaves.Cloud;
 import hudson.slaves.ComputerConnector;
 import hudson.slaves.ComputerLauncher;
 import hudson.slaves.DumbSlave;
@@ -180,6 +181,7 @@
 import java.util.logging.Level;
 import java.util.logging.LogRecord;
 import java.util.logging.Logger;
+import java.util.stream.Collectors;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletException;
@@ -1426,6 +1428,23 @@ public <V extends View> V configRoundtrip(V view) throws Exception {
         return view;
     }
 
+    /**
+     * Performs a configuration round-trip testing for a cloud.
+     * The given cloud is added to the cloud list of Jenkins.
+     *
+     * If a cloud with the same name already exists, then this old one will be replaced by the given one.
+     */
+    public <C extends Cloud> C configRoundtrip(C cloud) throws Exception {
+        Cloud cloudConfig = jenkins.getCloud(cloud.name);
+        if (cloudConfig != null) {
+            jenkins.clouds.remove(cloudConfig);
+        }
+        jenkins.clouds.add(cloud);
+        jenkins.save();
+        submit(createWebClient().goTo("configureClouds/").getFormByName("config"));
+        return (C)jenkins.getCloud(cloud.name);
+    }
+
 
     /**
      * Asserts that the outcome of the build is a specific outcome.