more unit tests

README.md

@@ -256,6 +256,8 @@ Here are the accepted types and their preview :
 
 ![](preview/links.svg)
 
+You can use **`none`** to make an invisible link.
+
 (soon)
 
 ### Font styles

test/rendering.test.js

@@ -125,6 +125,10 @@ describe('getLinkPath (non-regression)', () => {
       });
     });
   });
+
+  test('none', () => {
+    expect(rendering().getLinkPath('none', 1)).toEqual(null);
+  });
 });
 
 describe('getBounds', () => {