8328194: Add a test to check default rendering engine

Reviewed-by: prr, tr

test/jdk/sun/java2d/marlin/DefaultRenderingEngine.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import sun.java2d.pipe.RenderingEngine;
+
+/**
+ * @test
+ * @bug 8241307
+ * @summary Verifies that the Marlin renderer is the default RenderingEngine
+ * @modules java.desktop/sun.java2d.pipe
+ */
+public final class DefaultRenderingEngine {
+
+    public static void main(String[] argv) {
+
+        final RenderingEngine engine = RenderingEngine.getInstance();
+
+        if (!engine.getClass().getSimpleName().contains("Marlin")) {
+            throw new RuntimeException("Marlin must be the default RenderingEngine");
+        }
+    }
+}