diff --git a/src/test/java/org/xbib/standardnumber/DOITests.java b/src/test/java/org/xbib/standardnumber/DOITests.java
index 58687fa..49b6d90 100644
--- a/src/test/java/org/xbib/standardnumber/DOITests.java
+++ b/src/test/java/org/xbib/standardnumber/DOITests.java
@@ -10,11 +10,21 @@ public class DOITests {
 
     @Test
     public void testDOI() throws Exception {
-        StandardNumber doi = StandardNumber.getInstance("doi").set("10.1016/0032-3861(93)90481-o").normalize().verify();
+        StandardNumber doi = StandardNumber.getInstance("doi")
+                .set("10.1016/0032-3861(93)90481-o").normalize().verify();
         assertEquals("10.1016/0032-3861(93)90481-o", doi.normalizedValue());
         assertEquals("http://doi.org/10.1016/0032-3861(93)90481-o", doi.format());
     }
 
+    @Test
+    public void testURL() throws Exception {
+        StandardNumber doi = StandardNumber.getInstance("doi")
+                .set("http://doi.org/10.1016/0032-3861(93)90481-o").normalize().verify();
+        assertEquals("10.1016/0032-3861(93)90481-o", doi.normalizedValue());
+        assertEquals("http://doi.org/10.1016/0032-3861(93)90481-o", doi.format());
+    }
+
+
     @Test
     public void testClone() throws Exception {
         StandardNumber doi = StandardNumber.getInstance("doi").set("10.1016/0032-3861(93)90481-o").normalize().verify();