Add @DataBoundConstructor to SleepBuilder along with test unit.

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

@@ -29,6 +29,7 @@ import hudson.model.AbstractBuild;
 import hudson.model.BuildListener;
 import hudson.model.Descriptor;
 import hudson.tasks.Builder;
+import org.kohsuke.stapler.DataBoundConstructor;
 
 import java.io.IOException;
 
@@ -40,6 +41,7 @@ import java.io.IOException;
 public class SleepBuilder extends Builder {
     public final long time;
 
+    @DataBoundConstructor
     public SleepBuilder(long time) {
         this.time = time;
     }

test/src/main/resources/org/jvnet/hudson/test/SleepBuilder/config.jelly

@@ -23,4 +23,8 @@ THE SOFTWARE.
 -->
 
 <?jelly escape-by-default='true'?>
-<j:jelly xmlns:j="jelly:core" />
\ No newline at end of file
+<j:jelly xmlns:j="jelly:core" xmlns:f="/lib/form">
+    <f:entry field="time" title="${%Time}">
+        <f:textbox />
+    </f:entry>
+</j:jelly>
\ No newline at end of file

test/src/test/groovy/org/jvnet/hudson/test/SleepBuilderTest.groovy

+package org.jvnet.hudson.test
+
+import org.junit.Rule
+import org.junit.Test
+
+/**
+ * @author schristou@cloudbees.com
+ * Date: 9/17/13
+ * Time: 11:43 AM
+ * To change this template use File | Settings | File Templates.
+ */
+class SleepBuilderTest {
+    @Rule public JenkinsRule j = new JenkinsRule();
+    @Test
+    void testPerform() {
+        def project = j.createFreeStyleProject();
+        def builder = new SleepBuilder(30)
+        project.buildersList.add(builder);
+        j.configRoundtrip(project);
+        j.assertEqualDataBoundBeans(project.buildersList.get(SleepBuilder.class), builder);
+    }
+}