add unit test for m.route() overload

tests/mithril-tests.js

@@ -415,6 +415,24 @@ function testMithril(mock) {
 		var paramValueAfter = m.route.param("a1")
 		return mock.location.search == "?/" && paramValueBefore === "foo" && paramValueAfter === undefined
 	})
+	test(function() {
+		//https://github.com/lhorie/mithril.js/issues/61
+		mock.performance.$elapse(50)
+		mock.location.search = "?"
+		
+		var module = {controller: function() {}, view: function() {return m.route.param("a1")}}
+		
+		var root = mock.document.createElement("div")
+		m.route.mode = "search"
+		m.route(root, "/test7/foo", {
+			"/": module,
+			"/test7/:a1": module
+		})
+		var routeValueBefore = m.route()
+		m.route("/")
+		var routeValueAfter = m.route()
+		return routeValueBefore === "/test7/foo" && routeValueAfter === "/"
+	})
 
 	//m.prop
 	test(function() {