带有es6承诺对象的sinon存根

好的，我的设置如下：使用节点6.2，es6-promisify，sinon，sinon-promised和babel转换对es6导入/导出的支持。

我的测试代码看起来像这样：

const client = restify.createJsonClient({
    url: 'http://www.example.com'
});
export let get = promisify(client.get, {thisArg: client, multiArgs: true});

export default function* () {
    yield get('/some/path');
}

然后在我的测试文件中，我将得到以下内容：

import * as m from mymodule;
it('should fail', function(done) {
    let stub = sinon.stub(m, 'get').rejects('i failed');
    client.get('/endpoint/that/leads/to/mymodule/call', function(err, req, res, data) {
        stub.called.should.be.eql(true); // assertion fails!!
        done();
    }
});

我也尝试过将原始的client.get调用存根，但这也不起作用。我要做的唯一一件事就是在每次调用时即时进行通知，并将原始的client.get存根，这似乎很la脚。例如：

export const client = restify.createJsonClient({
    url: 'http://www.example.com'
});
function get() {
    return promisify(client.get, {thisArg: client, multiArgs: true});
}

export default function* () {
    yield get('/some/path');
}

和测试代码这样做：

import {module_client} from mymodule;
it('should fail', function(done) {
    let stub = sinon.stub(module_client, 'get').yields('i failed');
    client.get('/endpoint/that/leads/to/mymodule/call', function(err, req, res, data) {
        stub.called.should.be.eql(true); // assertion succeeds
        done();
    }
});

因此，问题（如果不是很明显的话）为什么我的原始代码不起作用？有没有一种方法可以使存根工作而不会每次都要求原始的重新调整（例如，其他人如何使这种事情工作）？

编辑：

当前代码如下：

const client = restify.createJsonClient({
    url: 'http://www.example.com'
});

export let get = promisify(client.get, {thisArg: client, multiArgs: true});

export default function*() {
    try {
        console.log(exports.get); // <= a large sinon stub object, I'll post that below
        yield exports.get(); // <= throws here, "exports.get is not a function"
    }
    catch(ex) {
        log.error('got an error', ex);
        throw ex;
    }
}

console.log打印以下内容：

{ [Function: proxy]
  isSinonProxy: true,
  reset: [Function],
  invoke: [Function: invoke],
  named: [Function: named],
  getCall: [Function: getCall],
  getCalls: [Function],
  calledBefore: [Function: calledBefore],
  calledAfter: [Function: calledAfter],
  withArgs: [Function],
  matches: [Function],
  printf: [Function],
  calledOn: [Function],
  alwaysCalledOn: [Function],
  calledWith: [Function],
  calledWithMatch: [Function],
  alwaysCalledWith: [Function],
  ....

编辑2：

FWIW，babel生成的代码正在生成此代码：

let get = exports.get = (0, _es6Promisify2.default)(client.get, { thisArg: client, multiArgs: true });

编辑3：

好的，很奇怪。我更改了源来执行此操作：

const client = restify.createJsonClient({
    url: 'http://www.example.com'
});

export let get = promisify(client.get, {thisArg: client, multiArgs: true});

export default function*() {
    try {
        let thePromise = exports.get(); // e.g. call exports.get on separate line from the yield
        yield thePromise; // and the throw now says 'undefined is not a function'. I should note that in both cases, the stack trace shows the error on node_modules/co/index.js at line 65.
    }
    catch(ex) {
        log.error('got an error', ex);
        throw ex;
    }
}