pakmanaged.js
function respondTo (method, msg) {
        if (msg) flag(this, 'message', msg);
        var obj = flag(this, 'object')
          , itself = flag(this, 'itself')
          , context = ('function' === _.type(obj) && !itself)
            ? obj.prototype[method]
            : obj[method];
    
        this.assert(
            'function' === typeof context
          , 'expected #{this} to respond to ' + _.inspect(method)
          , 'expected #{this} to not respond to ' + _.inspect(method)
        );
      }
function respondTo (method, msg) {
        if (msg) flag(this, 'message', msg);
        var obj = flag(this, 'object')
          , itself = flag(this, 'itself')
          , context = ('function' === _.type(obj) && !itself)
            ? obj.prototype[method]
            : obj[method];
    
        this.assert(
            'function' === typeof context
          , 'expected #{this} to respond to ' + _.inspect(method)
          , 'expected #{this} to not respond to ' + _.inspect(method)
        );
      }
### .respondTo(method)

Asserts that the object or class target will respond to a method.

Klass.prototype.bar = function(){};
expect(Klass).to.respondTo('bar');
expect(obj).to.respondTo('bar');

To check if a constructor will respond to a static function,
set the `itself` flag.

Klass.baz = function(){};
expect(Klass).itself.to.respondTo('baz');

@name respondTo
@alias respondsTo
@param {String} method
@param {String} message _optional_
@api public