Question

我有一个导入另一个文件。我想在每个测试中以不同的方式模拟其他导入，但要通过导入它的文件来显示它。

我尝试了通过谷歌搜索进行各种模拟和导入的方法，但是都没有用。

考虑文件：

settings.js

export default { mySetting: null };

store.js

import settings from "./settings";
export default {
  settings: { ...settings },
};

settingsDemo.js

import store from "./store";

it("default settings", () => {
  expect(store.settings.mySetting).toBe(null);
});

it("mocked to true", () => {
  expect(store.settings.mySetting).toBe(true);
});

it("mocked to false", () => {
  expect(store.settings.mySetting).toBe(false);
});

如何在settingsDemo.js中模拟这些文件以使所有3个测试都通过而无需编辑settings.js或store.js？

注意：这类似于我的previous question，但是导入依赖项和更改值的解决方案在这种情况下不起作用，因为store在这里未引用settings对象，而是克隆它是一个初始值。

Answer 1

同样的原则适用："while you can't change the value of imports, you can change the objects that they are referring to."

在这种情况下，store是包含嵌套settings对象的对象。虽然不可能简单地将store分配给其他内容，但是可以将store.settings分配给其他内容。也可以将store.settings.mySetting设置为其他值：

import store from "./store";

it("default settings", () => {
  expect(store.settings.mySetting).toBe(null);  // SUCCESS
});

it("mocked to true", () => {
  store.settings = { mySetting: true };  // set store.settings to something else
  expect(store.settings.mySetting).toBe(true);  // SUCCESS
});

it("mocked to false", () => {
  store.settings.mySetting = false;  // set store.settings.mySetting to something else
  expect(store.settings.mySetting).toBe(false);  // SUCCESS
});

Answer 2

我不确定我是否理解你的问题。听起来您只想模拟一个简单的对象
“ {settings:{ mySetting: null }}”。

let store = {settings:{ mySetting: null }}

it("default settings", () => {
  store.settings.mySetting = null
  expect(store.settings.mySetting).toBe(null);
});

it("mocked to true", () => {
  store.settings.mySetting = true
  expect(store.settings.mySetting).toBe(true);
});

it("mocked to false", () => {
  store.settings.mySetting = false
  expect(store.settings.mySetting).toBe(false);
});

在每个测试中如何模拟克隆的导入依赖关系

2 个答案: