Code refactor for AbsoluteValue improvements (#3018)

Fix #3017

Co-authored-by: Yang Libin <szuyanglb@outlook.com>

src/test/java/com/thealgorithms/maths/AbsoluteValueTest.java

@@ -0,0 +1,18 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class AbsoluteValueTest {
+
+    @Test
+    void testGetAbsValue() {
+        Stream.generate(() -> ThreadLocalRandom.current().nextInt())
+                .limit(1000)
+                .forEach(number -> assertEquals(Math.abs(number), AbsoluteValue.getAbsValue(number)));
+    }
+}