Add unit tests for RotatingCalipers class

Author: sandeepgoudmacha

src/test/java/com/thealgorithms/geometry/rotatingCalipersTest.java

@@ -0,0 +1,17 @@
+package com.thealgorithms.geometry;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.Arrays;
+import org.junit.jupiter.api.Test;
+
+public class RotatingCalipersTest {
+    @Test
+    void testDiameterSquare() {
+        var square = Arrays.asList(
+            new Point(0, 0), new Point(0, 1),
+            new Point(1, 1), new Point(1, 0)
+        );
+        double diameter = RotatingCalipers.findDiameter(square);
+        assertEquals(Math.sqrt(2), diameter, 1e-6);
+    }
+}