Add regression test using RealJenkinsRule

Author: dwnusbaum

plugin/src/test/java/org/jenkinsci/plugins/workflow/cps/CpsFlowDefinitionRJRTest.java

@@ -1,6 +1,7 @@
 package org.jenkinsci.plugins.workflow.cps;
 
 import org.jenkinsci.plugins.workflow.job.WorkflowJob;
+import org.jenkinsci.plugins.workflow.job.WorkflowRun;
 import org.junit.Rule;
 import org.junit.Test;
 import org.jvnet.hudson.test.JenkinsRule;
@@ -21,4 +22,26 @@ private static void doesItSmoke(JenkinsRule r) throws Exception {
         p.setDefinition(new CpsFlowDefinition("print Jenkins.get().getRootDir().toString()", false));
         r.assertBuildStatusSuccess(p.scheduleBuild2(0));
     }
+
+    @Test
+    public void flushLogsOnShutdown() throws Throwable {
+        rjr.then(CpsFlowDefinitionRJRTest::flushLogsOnShutdownPreRestart);
+        rjr.then(CpsFlowDefinitionRJRTest::flushLogsOnShutdownPostRestart);
+    }
+
+    private static void flushLogsOnShutdownPreRestart(JenkinsRule r) throws Exception {
+        WorkflowJob p = r.createProject(WorkflowJob.class, "p");
+        p.setDefinition(new CpsFlowDefinition("sleep 10\n", true));
+        WorkflowRun b = p.scheduleBuild2(0).waitForStart();
+        r.waitForMessage("Sleeping for 10 sec", b);
+        r.jenkins.doQuietDown();
+    }
+
+    private static void flushLogsOnShutdownPostRestart(JenkinsRule r) throws Exception {
+        WorkflowJob p = r.jenkins.getItemByFullName("p", WorkflowJob.class);
+        WorkflowRun b = p.getLastBuild();
+        r.assertBuildStatusSuccess(r.waitForCompletion(b));
+        r.assertLogContains("Resuming build at ", b);
+        r.assertLogContains("Pausing (Preparing for shutdown)", b);
+    }
 }