feat(UrlMatcher): validates whole interface

urlMatcherFactoryProvider.isMatcher() now validates the entire UrlMatcher interface.

src/urlMatcherFactory.js

@@ -449,13 +449,22 @@ function $UrlMatcherFactory() {
    * @methodOf ui.router.util.$urlMatcherFactory
    *
    * @description
-   * Returns true if the specified object is a UrlMatcher, or false otherwise.
+   * Returns true if the specified object is a `UrlMatcher`, or false otherwise.
    *
    * @param {Object} object  The object to perform the type check against.
-   * @returns {Boolean}  Returns `true` if the object has the following functions: `exec`, `format`, and `concat`.
+   * @returns {Boolean}  Returns `true` if the object matches the `UrlMatcher` interface, by
+   *          implementing all the same methods.
    */
   this.isMatcher = function (o) {
-    return isObject(o) && isFunction(o.exec) && isFunction(o.format) && isFunction(o.concat);
+    if (!isObject(o)) return false;
+    var result = true;
+
+    forEach(UrlMatcher.prototype, function(val, name) {
+      if (isFunction(val)) {
+        result = result && (isDefined(o[name]) && isFunction(o[name]));
+      }
+    });
+    return result;
   };
 
   this.type = function (name, def) {

test/urlMatcherFactorySpec.js

@@ -29,6 +29,14 @@ describe("UrlMatcher", function () {
       provider.strictMode(false);
       expect(provider.compile('/hello').exec('/hello/')).toEqual({});
     });
+
+    it("should correctly validate UrlMatcher interface", function () {
+      var m = new UrlMatcher("/");
+      expect(provider.isMatcher(m)).toBe(true);
+
+      m.validates = null;
+      expect(provider.isMatcher(m)).toBe(false);
+    });
   });
 
   it("should match static URLs", function () {
@@ -177,7 +185,13 @@ describe("urlMatcherFactory", function () {
   it("recognizes matchers", function () {
     expect($umf.isMatcher(new UrlMatcher('/'))).toBe(true);
 
-    var custom = { format: angular.noop, exec: angular.noop, concat: angular.noop };
+    var custom = {
+      format:     angular.noop,
+      exec:       angular.noop,
+      concat:     angular.noop,
+      validates:  angular.noop,
+      parameters: angular.noop
+    };
     expect($umf.isMatcher(custom)).toBe(true);
   });