[ZEPPELIN-6281] Add Unit Tests for LivyVersion Class

### What is this PR for?
This PR adds a comprehensive suite of unit tests for the LivyVersion class. The LivyVersion class is critical for ensuring Zeppelin's compatibility with various versions of the Livy server.


### What type of PR is it?
Test

### Todos
* [x] Add LivyVersionTest.java with comprehensive test cases.
* [x] Ensure all tests pass with the existing LivyVersion implementation.

### What is the Jira issue?
[ZEPPELIN-6281](https://issues.apache.org/jira/browse/ZEPPELIN-6281)

### How should this be tested?

### Screenshots (if appropriate)

### Questions:
* Does the license files need to update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No


Closes #5029 from celinayk/ZEPPELIN-6281.

Signed-off-by: ParkGyeongTae <[email protected]>

Author: celinayk

livy/src/test/java/org/apache/zeppelin/livy/LivyVersionTest.java

@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.zeppelin.livy;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+class LivyVersionTest {
+
+  @Test
+  void testVersionParsing() {
+    LivyVersion v = new LivyVersion("1.6.2");
+    assertEquals(10602, v.toNumber());
+    assertEquals("1.6.2", v.toString());
+  }
+
+  @Test
+  void testPreReleaseVersionParsing() {
+    LivyVersion v = new LivyVersion("0.6.0-SNAPSHOT");
+    assertEquals(600, v.toNumber());
+    assertEquals("0.6.0-SNAPSHOT", v.toString());
+  }
+
+  @Test
+  void testComparisonLogic() {
+    LivyVersion v1 = new LivyVersion("0.5.0");
+    LivyVersion v2 = new LivyVersion("0.4.0");
+    assertTrue(v1.newerThan(v2));
+    assertTrue(v2.olderThan(v1));
+    assertFalse(v2.newerThan(v1));
+    assertFalse(v1.olderThan(v2));
+  }
+
+  @Test
+  void testInvalidVersionString() {
+    LivyVersion v1 = new LivyVersion("invalid");
+    assertEquals(99999, v1.toNumber());
+
+    LivyVersion v2 = new LivyVersion(null);
+    assertEquals(99999, v2.toNumber());
+  }
+
+  @Test
+  void isCancelSupported() {
+    assertTrue(new LivyVersion("0.3.0").isCancelSupported());
+    assertFalse(new LivyVersion("0.2.0").isCancelSupported());
+  }
+
+  @Test
+  void isSharedSupported() {
+    assertTrue(new LivyVersion("0.5.0").isSharedSupported());
+    assertFalse(new LivyVersion("0.4.0").isSharedSupported());
+  }
+
+  @Test
+  void isGetProgressSupported() {
+    assertTrue(new LivyVersion("0.4.0").isGetProgressSupported());
+    assertFalse(new LivyVersion("0.3.0").isGetProgressSupported());
+  }
+}
+