Add unit tests for line segment intersection

Author: sandeepgoudmacha

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

@@ -0,0 +1,20 @@
+package com.thealgorithms.geometry;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+public class LineSegmentIntersectionTest {
+    @Test
+    void testIntersectingSegments() {
+        Point p1 = new Point(1, 1), q1 = new Point(4, 4);
+        Point p2 = new Point(1, 4), q2 = new Point(4, 1);
+        assertTrue(LineSegmentIntersection.doIntersect(p1, q1, p2, q2));
+    }
+
+    @Test
+    void testNonIntersectingSegments() {
+        Point p1 = new Point(1, 1), q1 = new Point(2, 2);
+        Point p2 = new Point(3, 3), q2 = new Point(4, 4);
+        assertFalse(LineSegmentIntersection.doIntersect(p1, q1, p2, q2));
+    }
+}