Question

我试图存根：

Thing.where(uuid: options['uuid']).first

经：

allow(Thing).to receive_message_chain(:where, :first)
  .with(uuid: thing_double.uuid)
  .and_return(nil)

但这又回来了：

 #<Double (anonymous)> received :first with unexpected arguments
         expected: ({:uuid=>123})
              got: (no args)

我应该以不同的方式验证消息链的参数吗？

Answer 1

当参数与最终方法不同时，您可以将<?php class MY_Router extends CI_Router { protected function _set_routing() { if (file_exists(APPPATH.'config/routes.php')) { include(APPPATH.'config/routes.php'); } if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/routes.php')) { include(APPPATH.'config/'.ENVIRONMENT.'/routes.php'); } // Validate & get reserved routes if (isset($route) && is_array($route)) { isset($route['default_controller']) && $this->default_controller = $route['default_controller']; isset($route['translate_uri_dashes']) && $this->translate_uri_dashes = $route['translate_uri_dashes']; unset($route['default_controller'], $route['translate_uri_dashes']); $this->routes = $route; } if ($this->enable_query_strings) { if ( ! isset($this->directory)) { $route = isset($_GET['route']) ? trim($_GET['route'], " \t\n\r\0\x0B/") : ''; if ($route !== '') { $part = explode('/', $route); $this->uri->filter_uri($part[0]); $this->set_directory($part[0]); if ( ! empty($part[1])) { $this->uri->filter_uri($part[1]); $this->set_class($part[1]); // Testing function atm if ( ! empty($_GET['function'])) { $this->uri->filter_uri($_GET['function']); $this->set_method($_GET['function']); } $this->uri->rsegments = array( 1 => $this->class, 2 => $this->method ); } } else { $this->_set_default_controller(); } } // Routing rules don't apply to query strings and we don't need to detect // directories, so we're done here return; } // Is there anything to parse? if ($this->uri->uri_string !== '') { $this->_parse_routes(); } else { $this->_set_default_controller(); } } }与with结合使用。因此消息：

receive_message_chain

这是有道理的 - RSpec如何知道链中的哪个方法应该接收参数？

要验证参数预期，请不要对链进行存根，只需存根#<Double (anonymous)> received :first with unexpected arguments

where

或省略参数：

allow(Thing).to receive(:where).with(uuid: 1).and_return([])
expect(Thing.where(uuid: 1).first).to eq nil

不建议IMO {p>

 allow(Thing).to receive_message_chain(:where, :first).and_return(nil)
 expect(Thing.where(uuid: 1).first).to eq nil

。来自文档：

你应该考虑使用receive_message_chain代码嗅觉

Answer 2

这是我们解决类似情况的方法：

expect(Theme).to receive(:scoped).and_return(double('scope').tap do |scope| 
  expect(scope).to receive(:includes).with(:categories).and_return scope
  expect(scope).to receive(:where).with(categories: { parent_id: '1'}).and_return scope
  expect(scope).to receive(:order).with('themes.updated_at DESC').and_return scope
  expect(scope).to receive(:offset).with(10).and_return scope
  expect(scope).to receive(:limit).with(10000)
end)

Answer 3

有时有时容易出错（我会间歇性地收到一条错误消息，指出“参数数量错误（0表示1+）”；尽管这似乎仅在单个测试中执行多个receive_message_chains时才会发生），但是您也可以选择这样链接“ with”方法：

fun flatten [] = ...
  | flatten ((x,y)::pairs) = ...

val evenNumbers pairs = ...

RSpec：匹配receive_message_chain

3 个答案: