我有以下示例脚本来试验 Cypress 中的异常处理。但是异常没有被捕获。我在这里缺少什么?
Cypress.on('uncaught:exception', (err, runnable) => {
Cypress.log("this is top-level exception hadling")
return false
})
context('Actions', () => {
it('sample_testing', () => {
cy.on('uncaught:exception', (err, runnable) => {
cy.log("this is test-level exception hadling")
return false
})
cy.get("#notfound", {timeout:1000})
})
})
请注意,我的网页中没有未找到 id 的元素。
最佳答案
未捕获的异常仅针对应用程序错误。测试代码中的失败会被 Cypress 捕获,但随后会报告为测试失败。
测试失败
为了防止这种情况,您可以使用 fail event
Cypress.on('fail', (error, runnable) => {
debugger
// we now have access to the err instance
// and the mocha runnable this failed on
throw error // throw error to have test still fail
})
it('calls the "fail" callback when this test fails', () => {
// when this cy.get() fails the callback
// is invoked with the error
cy.get('element-that-does-not-exist')
})
未捕获的异常看看食谱 Handling Application Errors
app.js - 抛出错误
document.getElementById('error').addEventListener('click', () => {
console.log('application will throw an error in 1 second')
setTimeout(() => {
console.log('application is about to throw an error')
throw new Error('Things went bad')
}, 1000)
})
测试 - 捕获错误并有选择地忽略它是否有特定消息 it('can be ignored', () => {
/**
* By using "cy.on()" we can ignore an exception in the current test only.
* If you want to register exception handler for all tests using "Cypress.on()"
* @see https://on.cypress.io/catalog-of-events
* @param {Error} e The exception we caught
* @param {Mocha.Runnable} runnable is the current test or hook during which the error is caught
*/
cy.on('uncaught:exception', (e, runnable) => {
console.log('error', e)
console.log('runnable', runnable)
// we can simply return false to avoid failing the test on uncaught error
// return false
// but a better strategy is to make sure the error is expected
if (e.message.includes('Things went bad')) {
// we expected this error, so let's ignore it
// and let the test continue
return false
}
// on any other error message the test fails
})
cy.visit('index.html')
cy.get('button#error').click()
// the error happens after 1000ms
// we can use hard-coded wait, see the other test
// to learn how to avoid an unnecessary wait
cy.wait(1500)
})
关于未捕获异常的 Cypress 不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/68001586/