more test cases and remove useless code

Class.js

@@ -31,11 +31,6 @@
                 return !fn(input);
             };
         },
-        or: function(fn, fm) {
-            return function(input) {
-                return fn(input) || fm(input);
-            };
-        },
         and: function(fn, fm) {
             return function(input) {
                 return fn(input) && fm(input);
@@ -516,12 +511,7 @@
         });
     }
 
-    function copyDescriptors(origin, dest, propNames, accept) {
-        if (isFunction(accept)) {
-            propNames = propNames.filter(function(name) {
-                return accept(origin, dest, name);
-            });
-        }
+    function copyDescriptors(origin, dest, propNames) {
         propNames.forEach(function(name) {
             copyDescriptor(origin, dest, name);
         });

test/decorate.js

@@ -40,6 +40,9 @@ describe('test decorate', () => {
         expect(() => {
             Airplane.decorate(function(){});
         }).toThrow();
+        expect(() => {
+            Class.decorate();
+        }).toThrow();
     });
     it('decorate contrustor: decorator should be called', () => {
         var decorators = {
@@ -191,4 +194,25 @@ describe('test decorate', () => {
         }).not.toThrow();
         expect(thrownSpy).toHaveBeenCalled();
     });
+    it('decorate object: should not throw', () => {
+        var airplane = new Airplane();
+        expect(() => {
+            Class.decorate(airplane, {});
+        }).not.toThrow();
+    });
+    it('decorate object: "*" decorates all methods', () => {
+        var airplane = new Airplane();
+        var decorator = {
+            before: function(){}
+        };
+        var beforeSpy = spyOn(decorator, 'before');
+
+        Class.decorate(airplane, {
+            '*': decorator
+        });
+
+        airplane.fly();
+
+        expect(beforeSpy).toHaveBeenCalled();
+    });
 });