testing: improve tests coverage AbsoluteValueTest (#6385)

testing: improve tests coverage AbsoluteValueTest

Author: alxkm

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

@@ -12,4 +12,28 @@ public class AbsoluteValueTest {
     void testGetAbsValue() {
         Stream.generate(() -> ThreadLocalRandom.current().nextInt()).limit(1000).forEach(number -> assertEquals(Math.abs(number), AbsoluteValue.getAbsValue(number)));
     }
+
+    @Test
+    void testZero() {
+        assertEquals(0, AbsoluteValue.getAbsValue(0));
+    }
+
+    @Test
+    void testPositiveNumbers() {
+        assertEquals(5, AbsoluteValue.getAbsValue(5));
+        assertEquals(123456, AbsoluteValue.getAbsValue(123456));
+        assertEquals(Integer.MAX_VALUE, AbsoluteValue.getAbsValue(Integer.MAX_VALUE));
+    }
+
+    @Test
+    void testNegativeNumbers() {
+        assertEquals(5, AbsoluteValue.getAbsValue(-5));
+        assertEquals(123456, AbsoluteValue.getAbsValue(-123456));
+        assertEquals(Integer.MAX_VALUE, AbsoluteValue.getAbsValue(-Integer.MAX_VALUE));
+    }
+
+    @Test
+    void testMinIntEdgeCase() {
+        assertEquals(Integer.MIN_VALUE, AbsoluteValue.getAbsValue(Integer.MIN_VALUE));
+    }
 }