断言该元素在赛普拉斯中不可操作

Assert that element is not actionable in Cypress

如果某个元素在页面上不可操作(在本例中,被另一个元素覆盖)并且您尝试单击它,Cypress 将显示如下错误:

CypressError: Timed out retrying: cy.click() failed because this element:

<span>...</span>

is being covered by another element:

太棒了!但是有什么办法可以断言是这种情况,也就是无法单击该元素?

这行不通:

click_spec.coffee 查看 Cypress 测试。

it "throws when a non-descendent element is covering subject", (done) ->

  $btn = $("<button>button covered</button>")
    .attr("id", "button-covered-in-span")
    .prependTo(cy.$$("body"))

  span = $("<span>span on button</span>")
    .css(position: "absolute", 
         left: $btn.offset().left, 
         top: $btn.offset().top, 
         padding: 5, display: "inline-block", 
         backgroundColor: "yellow")
    .prependTo(cy.$$("body"))

  cy.on "fail", (err) =>
    ...
    expect(err.message).to.include "cy.click() failed because this element"
    expect(err.message).to.include "is being covered by another element"
    ...
    done()

  cy.get("#button-covered-in-span").click()

最简单的方法是模仿这个测试,尽管文档建议只使用 cy.on('fail') 进行调试。

这类似于使用 expect().to.throw() 检查是否按预期发生异常的单元测试,所以我觉得这里的模式是合理的。

为了彻底,我会包括对 click({force: true}).

的调用
it('should fail the click() because element is covered', (done) => {

  // Check that click succeeds when forced
  cy.get('button').click({ force: true })

  // Use once() binding for just this fail
  cy.once('fail', (err) => {

    // Capturing the fail event swallows it and lets the test succeed

    // Now look for the expected messages
    expect(err.message).to.include('cy.click() failed because this element');
    expect(err.message).to.include('is being covered by another element');

    done();
  });

  cy.get("#button-covered-in-span").click().then(x => {
    // Only here if click succeeds (so test fails)
    done(new Error('Expected button NOT to be clickable, but click() succeeded'));
  })

})

作为自定义命令

我不确定如何制作您要求的 chai 扩展,但逻辑可以包含在自定义命令中

/cypress/support/index.js

Cypress.Commands.add("isNotActionable", function(selector, done) {
  cy.get(selector).click({ force: true })
  cy.once('fail', (err) => {
    expect(err.message).to.include('cy.click() failed because this element');
    expect(err.message).to.include('is being covered by another element');
    done();
  });
  cy.get(selector).click().then(x => {
    done(new Error('Expected element NOT to be clickable, but click() succeeded'));
  })
}) 

/cypress/integration/myTest.spec.js

it('should fail the click() because element is covered', (done) => {
  cy.isNotActionable('button', done)
});

备注

我原以为 done() 会在测试前提(即按钮被覆盖)为假时超时。

这不会发生(原因未知),但是通过将 .then() 链接到第二次点击后允许调用 done() 并显示错误消息。 then() 回调只会在点击成功时被调用,否则 cy.once('fail') 回调会处理点击失败(根据赛普拉斯自己的测试)。

不是一般性答案,但如果元素已知且已知重叠,则仅指定 z 索引可能就足够了:

cy.get('element1').should('have.css', 'z-index', '2');
cy.get('element2').should('have.css', 'z-index', '1');