Add unit test for url parser.

ocaml/test.ml

@@ -38,6 +38,21 @@ let test_https test_ctx =
   let title = SimpleHttp.get_http_title (SimpleHttp.get_body url) in
   assert_equal (Some "Wikipedia, the free encyclopedia") title
 
+
+let test_is_url test_ctx =
+  let urls = [
+    ("http://foo.bar", true);
+    ("https://foo.bar", true);
+    ("www.foo.bar", true);
+    ("foo.bar", true);
+    ("http://www.foo.bar", true);
+    ("foo-bar", false);
+    ("http://www.foo.bar/baz/quuz", true)
+  ] in
+  let check (url, b) = assert_equal (Evaluate.is_url url) b in
+  List.iter check urls
+
+
 (* Name the test cases and group them together *)
 let suite =
 "suite">:::