compilation test for Supplier based converter maps

Signed-off-by: Ceki Gulcu <ceki@qos.ch>

logback-classic/src/test/java/ch/qos/logback/classic/pattern/SubPatternLayout.java

@@ -0,0 +1,31 @@
+/*
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2024, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+
+package ch.qos.logback.classic.pattern;
+
+import ch.qos.logback.classic.PatternLayout;
+
+import java.util.Map;
+
+/**
+ * Test backward compatibility support by virtue of correct compilation.
+ */
+public class SubPatternLayout extends PatternLayout {
+
+    SubPatternLayout() {
+        Map<String, String> defaultConverterMap = getDefaultConverterMap();
+        defaultConverterMap.put("dooo", DateConverter.class.getName());
+    }
+
+}