javascript - 如何检查多个 Jest spy 调用的多个参数？

Question

我在 React 组件中有以下函数:

onUploadStart(file, xhr, formData) {
  formData.append('filename', file.name);
  formData.append('mimeType', file.type);
}

这是我的测试，至少可以调用 spy :

const formData = { append: jest.fn() };
const file = { name: 'someFileName', type: 'someMimeType' };
eventHandlers.onUploadStart(file, null, formData);

expect(formData.append).toHaveBeenCalledWith(
  ['mimeType', 'someMimeType'],
  ['fileName', 'someFileName']
);

但是，断言不起作用:

Expected mock function to have been called with:
 [["mimeType", "someMimeType"], ["fileName", "someFileName"]]
But it was called with:
  ["mimeType", "someMimeType"], ["filename", "someFileName"]

使用toHaveBeenCalledWith的正确方法是什么？

Answer 1

我能够模拟多个调用并以这种方式检查参数:

expect(mockFn.mock.calls).toEqual([
  [arg1, arg2, ...], // First call
  [arg1, arg2, ...]  // Second call
]);

其中 mockFn 是您的模拟函数名称。