Add unit test for Delaunay triangulation

Author: sandeepgoudmacha

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

@@ -0,0 +1,21 @@
+package com.thealgorithms.geometry;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+public class DelaunayTriangulationTest {
+
+    @Test
+    void testBasicTriangulation() {
+        List<Point> points = Arrays.asList(
+            new Point(0, 0), new Point(1, 0),
+            new Point(0, 1), new Point(1, 1)
+        );
+
+        List<DelaunayTriangulation.Triangle> triangles = DelaunayTriangulation.triangulate(points);
+        assertFalse(triangles.isEmpty());
+        assertTrue(triangles.size() >= 2); // At least 2 triangles for a square
+    }
+}