[JENKINS-48463] Added a unit test that validates jenkins xml v1.0 configs

are silently migrated to xml v1.1 as they are persisted

core/src/test/java/hudson/XmlFileTest.java

@@ -7,7 +7,6 @@ import java.io.IOException;
 import java.net.URL;
 
 import jenkins.model.Jenkins;
-import org.junit.Ignore;
 import org.junit.Test;
 
 import static org.hamcrest.CoreMatchers.is;
@@ -44,28 +43,7 @@ public class XmlFileTest {
             assertThat(n.getMode().toString(), is("NORMAL"));
         }
     }
-
-    @Test
-    @Ignore
-    //TODO: find a way to complete this test
-    public void xml1_0ConfigMigrateTo1_1Test() throws IOException {
-        URL configUrl = getClass().getResource("/hudson/config_1_0.xml");
-        File configFile = new File(configUrl.getFile());
-        XStream2  xs = new XStream2();
-        xs.alias("hudson", Jenkins.class);
-
-        XmlFile xmlFile =  new XmlFile(xs, configFile);
-        if (xmlFile.exists()) {
-            Node n = (Node) xmlFile.read();
-            assertThat(n.getNumExecutors(), is(2));
-            assertThat(n.getMode().toString(), is("NORMAL"));
-            // this fails, because configFile.getParent() returns null....how do i fix?
-            n.save();
-            // Now verify that the node is showing <?xml version='1.1'> tag
-        }
-
-    }
-
+    
     @Test
     public void canReadXmlWithControlCharsTest() throws IOException {
         URL configUrl = getClass().getResource("/hudson/confg_1_1_with_special_chars.xml");

test/src/test/java/hudson/XMLFileTest.java

 package hudson;
 
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
 import org.junit.Rule;
 import org.junit.Test;
 import org.jvnet.hudson.test.JenkinsRule;
@@ -20,4 +23,23 @@ public class XMLFileTest {
         assertThat(j.jenkins.getLabelString(),is("LESS_TERMCAP_mb=\u001B[01;31m"));
 
     }
+
+    /**
+     *
+     * This test validates that xml v1.0 configs silently get migrated to xml v1.1 when they are persisted
+     *
+     */
+    @Test
+    @LocalData
+    public void silentlyMigrateConfigsTest() throws Exception {
+        j.jenkins.save();
+        // verify that we did indeed load our test config.xml
+        assertThat(j.jenkins.getLabelString(), is("LESS_TERMCAP_mb=\u001B[01;31m"));
+        //verify that the persisted top level config.xml is v1.1
+        File configFile = new File(j.jenkins.getRootPath().getRemote() + File.separator + "config.xml");
+        assertThat(configFile.exists(), is(true));
+        BufferedReader config = new BufferedReader(new FileReader(configFile));
+        assertThat(config.readLine(), is("<?xml version='1.1' encoding='UTF-8'?>"));
+        config.close();
+    }
 }

test/src/test/resources/hudson/XMLFileTest/silentlyMigrateConfigsTest/config.xml

+<?xml version='1.0' encoding='UTF-8'?>
+<hudson>
+    <disabledAdministrativeMonitors/>
+    <version>1.480.1</version>
+    <numExecutors>2</numExecutors>
+    <mode>NORMAL</mode>
+    <label>LESS_TERMCAP_mb=&#x1b;[01;31m</label>
+    <!-- Yeah, we deleted a lot of this ... fine for testing. -->
+</hudson>
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