add test for rectangle intersects with zero area rectangle

Author: davidmoten

src/test/java/com/github/davidmoten/rtree/geometry/RectangleTest.java

@@ -138,6 +138,14 @@ public void testIntersectsOneRectangleContainsTheOther() {
         assertTrue(b.intersects(a));
     }
 
+    @Test
+    public void testIntersectsOneRectangleReturnsTrueDespiteZeroArea() {
+        Rectangle a = rectangle(10, 50, 50, 50);
+        Rectangle b = rectangle(20, 20, 60, 60);
+        assertTrue(a.intersects(b));
+        assertTrue(b.intersects(a));
+    }
+    
     @Test
     public void testContains() {
         Rectangle r = rectangle(10, 20, 30, 40);