我已经开始使用 import * as obj 样式，该样式将从模块中导入所有导出作为对象的属性，然后可以对其进行模拟。我发现这比使用诸如rewire或proxyquire或任何类似技术之类的方法要干净得多。例如，在需要模拟Redux操作时，我经常这样做。在上面的示例中，我可能会使用以下示例：

I've started employing the import * as obj style within my tests, which imports all exports from a module as properties of an object which can then be mocked. I find this to be a lot cleaner than using something like rewire or proxyquire or any similar technique. I've done this most often when needing to mock Redux actions, for example. Here's what I might use for your example above:

import * as network from 'network.js';

describe("widget", function() {
  it("should do stuff", function() {
    let getDataFromServer = spyOn(network, "getDataFromServer").andReturn("mockData")
    let widget = new Widget();
    expect(getDataFromServer).toHaveBeenCalledWith("dataForWidget");
    expect(otherStuff).toHaveHappened();
  });
});

如果您的函数恰好是默认导出，则 import * as network从'./network'会产生 {default：getDataFromServer} ，您可以模拟network.default。

If your function happens to be a default export, then import * as network from './network' would produce {default: getDataFromServer} and you can mock network.default.