Code refactor for AbsoluteMin improvements (#3022)

Fix #3021

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

@@ -0,0 +1,21 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class AbsoluteMinTest {
+
+    @Test
+    void testGetMinValue() {
+        assertEquals(0, AbsoluteMin.getMinValue(4, 0, 16));
+        assertEquals(-2, AbsoluteMin.getMinValue(3, -10, -2));
+    }
+
+    @Test
+    void testGetMinValueWithNoArguments() {
+        Exception exception = assertThrows(IllegalArgumentException.class, () -> AbsoluteMin.getMinValue());
+        assertEquals("Numbers array cannot be empty", exception.getMessage());
+    }
+}