restore test-case for issue #37987

Author: ndeloof

src/test/java/org/jenkinsci/plugins/docker/workflow/DockerDSLTest.java

@@ -60,6 +60,7 @@
 import org.junit.Test;
 import org.junit.runners.model.Statement;
 import org.jvnet.hudson.test.BuildWatcher;
+import org.jvnet.hudson.test.Issue;
 import org.jvnet.hudson.test.RestartableJenkinsRule;
 
 public class DockerDSLTest {
@@ -145,6 +146,22 @@ private static void grep(File dir, String text, String prefix, Set<String> match
         });
     }
 
+    @Issue("JENKINS-37987")
+    @Test public void entrypoint() {
+        story.addStep(new Statement() {
+            @Override public void evaluate() throws Throwable {
+                assumeDocker();
+                WorkflowJob p = story.j.jenkins.createProject(WorkflowJob.class, "p");
+                p.setDefinition(new CpsFlowDefinition(
+                        "docker.image('maven:latest').inside {\n" +
+                               "  sh 'mvn -version'\n" +
+                               "}", true));
+
+                story.j.assertBuildStatusSuccess(p.scheduleBuild2(0));
+            }
+        });
+    }
+
     @Test public void endpoints() {
         story.addStep(new Statement() {
             @Override public void evaluate() throws Throwable {