好了，我最终重新定义了de global expect jest函数：

const originalExpect = expect

// Match patterns of the form __3-4-5__ (including the underscores)
const toMatch = /__\d+-\d+-\d+__/g

// Each node of the tree has only 3 properties: a type, props and children.
// Inside the props it is the className, we remove substrings of the className
// using the match form. If the node has children, then we recursively walk through them.
function removeCLVersion(obj) {
    if (!obj || typeof obj !== 'object') return obj
    if ('props' in obj && 'className' in obj.props) obj.props.className = obj.props.className.replace(toMatch, '__')
    if ('children' in obj && obj.children) obj.children = obj.children.map(element => removeCLVersion(element))
    return obj
}

// Javascript functions cant be changed, so we are replacing it with a custom one that
// removes the CL version of the received object in the toMatchSnapshot method
global.expect = received => {
    const resultObject = originalExpect(received)
    resultObject.toMatchSnapshot = () => originalExpect(removeCLVersion(received)).toMatchSnapshot()
    return resultObject
}
// And then we add the methods of the original function to our new expect function
Object.assign(expect, {...originalExpect})

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我在jest setupFilesAfterEnv中做了这件事。它可以用来重写expect result对象的任何方法。