如何在softAssertAll上应用expect或在softAssertAll通过的测试结果中明确显示（错误：预期对象是一个函数）

Question

I'm using 'soft-assert' library ( soft-assert library ) to apply assertion on my test steps without stopping the test if any of them fail.

According to the documentation, all soft-assert is verified at the end of the test by using softAssertAll() command. And this works very well. However, if nothing fails, I don't see any explicit message in my test result as when I use expect command.

So, I'm trying to apply expect over the softAssertAll() command, as it's seen below, but I'm getting the error message: "expected { Object (userInvocationStack, specWindow, ...) } to be a function"

What I'm trying to do:

 expect(cy.softAssertAll()).not.throw(Error)

Does anyone know how can I do this or solve the error in the image below? Thanks in advance.

Answer 1

See the Chai example for throw

var badFn = function () { throw new TypeError('Illegal salmon!'); };
expect(badFn).to.throw();

Note you pass in the function name without invoking it. I think this allows chai to wrap the function invocation in a try-catch and gracefully report the failure.

You can't do the same with a Cypress custom command as it will not raise errors in the same way as badFn above. Internally it swallows any error and sets the state of the test to "failed".

You could reasonably expect this to work

expect(jsonAssertion.softAssertAll).not.throw()

however there's an internal error in jsonAssertion that seems to be related to the this reference inside it's class.

TypeError: Cannot read properties of undefined (reading '_softThrowJsonDiffArray')

To fix, use an arrow function

const testSoftAssertAll = () => jsonAssertion.softAssertAll();
expect(testSoftAssertAll).not.throw()

or shorter

expect(() => jsonAssertion.softAssertAll()).not.throw()

---

Check the diff array

This is cleaner and clearer

// expect all soft-assert to be passing
expect(jsonAssertion.jsonDiffArray).to.eq(undefined)

// expect first soft-assert to fail with a certain message
expect(jsonAssertion.jsonDiffArray[0].error.message).to.contain('Illegal salmon')