[英]Jest - one function mocks file for multiple test files
我想要这样的东西:
mockFunctions.ts
jest.mock('../utils', () => {
return {
getNumbers: () => [1,2,3]
}
})
__tests__/test1.ts
---import from mockFunctions---
...
it('After adding another number array has more elements', () => {
const numbers = <get these numbers using mock function>
expect([...numbers, 11]).toHaveLength(4);
})
__tests__/test2.ts
---import from mockFunctions---
...
it('After removing a number, array has less elements', () => {
const numbers = <get these numbers using mock function>
expect(numbers.filter(x => x>1)).toHaveLength(2);
})
是否可以在一个文件中实现模拟功能,然后将它们导入多个测试文件中?
有一些替代方法可以实现这一点:
__mocks__
目录。 见https://jestjs.io/docs/en/manual-mocks实用程序/ index.js
export const getNumbers= () => [1, 2, 3, 4, 5];
->utils/ __mocks__
/index.js
export const getNumbers= () => [3, 4];
开玩笑的配置文件
{
"setupFilesAfterEnv": [
"<rootDir>/jestSetup.js"
]
}
jestSetup.js
jest.mock("../utils"); // will apply to all tests
开玩笑的配置文件
{
"setupFilesAfterEnv": [
"<rootDir>/jestSetup.js"
]
}
jestSetup.js
jest.mock("../utils", () => ({
getNumbers: () => [3, 4]
}));
或者用模拟创建一个文件
模拟.js
jest.mock("../utils", () => ({
getNumbers: () => [3, 4]
}));
jestSetup.js
import './mocks.js'
如果您不想在特定测试中使用模拟,您可以调用:
jest.unmock('../utils')
请参阅: https : //jestjs.io/docs/en/jest-object#jestunmockmodulename
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