version information is self declared by modules.

Due to cyclical dependency reasons, it is not possible for VersionUtil in
logback-core to querty properties files located in logback-classic. It
follows that, logback-classic deplicated some code found in VersionUtil
in ClassicVersionUtil.

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

Author: ceki

logback-classic-blackbox/src/test/java/ch/qos/logback/classic/blackbox/VersionCheckTest.java

@@ -14,12 +14,15 @@
 
 package ch.qos.logback.classic.blackbox;
 
+import ch.qos.logback.classic.ClassicConstants;
 import ch.qos.logback.classic.LoggerContext;
 import ch.qos.logback.core.CoreConstants;
 import ch.qos.logback.core.util.VersionUtil;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
 
 /**
@@ -44,6 +47,8 @@
 public class VersionCheckTest {
 
 
+    // WARNING: do not add other tests to this file
+
     LoggerContext loggerContext = new LoggerContext();
 
     /**
@@ -66,4 +71,6 @@ public void versionTest() {
         }
     }
 
+    // WARNING: do not add other tests to this file
+
 }

logback-classic-blackbox/src/test/java/ch/qos/logback/classic/blackbox/util/ClassicVersionUtilTest.java

@@ -0,0 +1,32 @@
+/*
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ *  Copyright (C) 1999-2026, 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.blackbox.util;
+
+import ch.qos.logback.classic.util.ClassicVersionUtil;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ClassicVersionUtilTest {
+
+    @Test
+    public void bySelfDeclaredProperties() {
+        String version = ClassicVersionUtil.getVersionBySelfDeclaredProperties();
+        assertNotNull(version);
+        assertTrue(version.startsWith("1.5"));
+    }
+
+}

logback-classic-blackbox/src/test/java/module-info.java

@@ -25,4 +25,5 @@
 
     // resources in named modules are accessible only if opened
     opens asResource;
+    exports ch.qos.logback.classic.blackbox.util;
 }