Raise default permissions of JUnit5JenkinsRule (#910)

Co-authored-by: strangelookingnerd <strangelookingnerd@users.noreply.github.com>

src/main/java/org/jvnet/hudson/test/junit/jupiter/JUnit5JenkinsRule.java

@@ -2,6 +2,8 @@
 
 import edu.umd.cs.findbugs.annotations.NonNull;
 import java.lang.reflect.Method;
+
+import hudson.security.ACL;
 import org.junit.jupiter.api.extension.ExtensionContext;
 import org.junit.jupiter.api.extension.ParameterContext;
 import org.junit.runner.Description;
@@ -26,6 +28,9 @@ class JUnit5JenkinsRule extends JenkinsRule {
 
     @Override
     public void recipe() throws Exception {
+        // so that test code has all the access to the system
+        ACL.as2(ACL.SYSTEM2);
+
         JenkinsRecipe jenkinsRecipe =
                 context.findAnnotation(JenkinsRecipe.class).orElse(null);
         if (jenkinsRecipe != null) {

src/test/java/org/jvnet/hudson/test/JenkinsRulePermissionTest.java

@@ -0,0 +1,54 @@
+package org.jvnet.hudson.test;
+
+import hudson.security.Permission;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.jupiter.api.Assertions;
+import org.jvnet.hudson.test.junit.jupiter.WithJenkins;
+
+/**
+ * Validates that JUnit4 and JUnit5 based {@link JenkinsRule} implementations have the same default authorization and permissions.
+ */
+@SuppressWarnings("deprecation")
+public class JenkinsRulePermissionTest {
+
+    @Rule
+    public JenkinsRule junit4rule = new JenkinsRule();
+
+    @org.junit.Test
+    public void junit4() {
+        MockAuthorizationStrategy strategy = new MockAuthorizationStrategy();
+        junit4rule.getInstance().setAuthorizationStrategy(strategy);
+
+        // basic permissions
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.READ));
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.WRITE));
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.CREATE));
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.UPDATE));
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.DELETE));
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.CONFIGURE));
+
+        // admin permissions
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.FULL_CONTROL));
+        Assert.assertTrue(junit4rule.getInstance().getACL().hasPermission(Permission.HUDSON_ADMINISTER));
+    }
+
+    @org.junit.jupiter.api.Test
+    @WithJenkins
+    void junit5(JenkinsRule junit5rule) {
+        MockAuthorizationStrategy strategy = new MockAuthorizationStrategy();
+        junit5rule.getInstance().setAuthorizationStrategy(strategy);
+
+        // basic permissions
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.READ));
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.WRITE));
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.CREATE));
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.UPDATE));
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.DELETE));
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.CONFIGURE));
+
+        // admin permissions
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.FULL_CONTROL));
+        Assertions.assertTrue(junit5rule.getInstance().getACL().hasPermission(Permission.HUDSON_ADMINISTER));
+    }
+}