Question

我只是想知道是否有办法模拟一个＆＃34;没有连接＆＃34;摩卡单元测试中的事件。我有一个方法返回一个承诺，应该等待与轮询策略的互联网连接，我想用mocha测试它。有一种方法可以达到这样的效果。

一些代码：

it('should wait for connection', function(done)
{
   this.timeout(2500);

   //simulate an internet connection drop here

   wait.connection().then(done);
   setTimeout(//activate connection, 2000);
});

感谢您的回复。

[编辑]：这里有我要测试的代码：

var wait = {
connection: function()
  {
    'use strict';
    var settings = {retry: 1000};

    return new Promise(function(resolve)
    {
      (function poll()
      {
        needle.get('https://api.ipify.org', function(error, response)
        {
          if(!error && response.statusCode === 200 && /^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$|^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$|^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$/.test(response.body))
            resolve();
          else
            wait.for(settings.retry).then(poll);
        });
      })();
    });
  }
};

在这种情况下，Promise将保持挂起状态，因为新的连接可用。如何在needle获取请求中模拟错误？

Answer 1

您可以使用sinon来存根needle.get

var needle = require("needle");
var sinon = require("sinon");;

before(() => {
    sinon.stub(needle, "get", (url, calback) => {
        var dummyError = {};
        callback(dummyError);
    })
});

// Run your 'it' here 

after(() => {
    needle.get.restore();
});

Answer 2

您可以使用Private Function GeneratePDF(ByVal streamFO As IO.Stream, ByVal pdfFile As String) As Boolean 'OLD Dim streamFO As java.io.FileInputStream = New java.io.FileInputStream(foFile) Dim memStreamFo As ApacheFop.Net.tools.DotNetInputStream = New ApacheFop.Net.tools.DotNetInputStream(streamFO) Dim src As org.xml.sax.InputSource = New org.xml.sax.InputSource(memStreamFo) Dim streamOut As java.io.FileOutputStream = New java.io.FileOutputStream(pdfFile) Dim oDriver As org.apache.fop.apps.Driver = New org.apache.fop.apps.Driver(src, streamOut) oDriver.setRenderer(org.apache.fop.apps.Driver.RENDER_PDF) Try oDriver.run() BCreated = True Catch ex As Exception BCreated = False Finally streamOut.close() streamFO.close() oDriver.reset() GC.Collect() End Try End Function：https://github.com/nock/nock#enabledisable-real-http-requests

Answer 3

如果您没有连接或任何连接问题，请使用您的承诺的2015-04-…'并抓住它们。 reject()是一个函数，如果使用非null参数调用该函数，则表示您的测试不好。也许你必须尝试：

done

如何在mocha测试中模拟没有连接

3 个答案: