如何使用Jest在React JS中使用Mock函数？

Question

我正在尝试使用以下功能模拟功能： Facebook的Jest Mock Functions

但是，我收到此错误：

 jest.mock is not a function

    TypeError: jest.mock is not a function
        at evaluate (https://oq7kwzrnj5.codesandbox.io/src/ListItem.spec.js:21:6)
        at r.a (https://codesandbox.io/static/js/sandbox.f3fc5e5b.js:5354:971)
        at e.value (https://codesandbox.io/static/js/sandbox.f3fc5e5b.js:5413:270)
        at e.value (https://codesandbox.io/static/js/sandbox.f3fc5e5b.js:5386:23195)
        at e.value (https://codesandbox.io/static/js/sandbox.f3fc5e5b.js:5386:22974)
        at e. (https://codesandbox.io/static/js/sandbox.f3fc5e5b.js:5386:18687)
        at n (https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:2847:811)
        at Generator._invoke (https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:2847:599)
        at Generator.e.(anonymous function) [as next] (https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:2847:990)
        at o (https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:3049:316)
        at https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:3049:464
        at new Promise ()
        at new t (https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:678:776)
        at https://codesandbox.io/static/js/common-sandbox.5c75aa32.js:3049:258
        at https://codesandbox.io/static/js/sandbox.f3fc5e5b.js:5386:18996
        at Array.map ()

这是我的代码： https : //codesandbox.io/s/oq7kwzrnj5

有人可以帮我解决这个错误吗？

任何更新

Answer 1

您可以像这样模拟函数mockMyFunc = jest.fn（）

还要检查我对这个问题的答案： 为什么React JS中的实际长度和预期长度不相等