Async Await Typescript Cucumber assertion fails with UnhandledPromiseRejectionWarning: AssertionError: but the test itself still passes

Question

I've been trying to catch and throw this error thinking that might be the issue but the test still passes. I am at a loss as to how to catch/throw this (if that is the issue) so the test will fail when the assertion fails.

The Error Msg -

UnhandledPromiseRejectionWarning: AssertionError: expected '25' to equal '2500'
    at selectElement.getText.then
...
1 scenario (1 passed)
13 steps (13 passed)

Here is my code Feature Code

Then(/^I verify the below options are correct:$/, async (coverageTable: TableDefinition) => {
async function processArray2(array) {
  let ArrayList;
  let firstLetterlowerEl;
  let actualList;
  for (let i = 0; i < array.rows().length; i++) {
    ArrayList = Coverage_Defaults[array.rows()[i][0]][array.rows()[i][1]];
    firstLetterlowerEl = await array.rows()[i][0].charAt(0).toLowerCase() + array.rows()[i][0].slice(1);
    actualList = await coveragesAuto[firstLetterlowerEl].elementId;
    await assertions.assertDropDownSelectedValue(actualList,ArrayList);
  }
});

The assertion code

    public assertDropDownSelectedValue = async (elementId: string, expectedText: string, override?: string) => {
        try {
            let selectElement = override === 'xpath' ? element(by.xpath(elementId)).$('option:checked') : element(by.id(elementId)).$('option:checked');
            await selectElement.getText()
                .then((text: any) => expect(text).to.equal(expectedText)).catch(Err => {throw Err.stack})

        } catch (Err) {
            if (Err instanceof error.NoSuchElementError) {
                log.error(`${elementId} Element not found error \n ${Err.stack}`);
                throw Err.stack;
            } else if (Err instanceof error.ElementNotSelectableError) {
                log.error(Err.stack);
                throw Err.stack;
            } else {
                log.error(`Dropdown selected option does NOT match with expected text - elementId passed : ${elementId}`);
                throw Err;
            }
        }
    }

I should note that if I call the await assertions.assertDropDownSelectedValue(actualList,ArrayList) directly without the for loop that it works correctly (fails correctly). The reason I need the for loop is that I want to be able to loop through each value array in the table and compare it against the values of a dropdown. — BruceEng, Oct 15 '19 at 18:57

score 0 · Answer 1 · answered Dec 23 '19 at 13:07

I think you need to use an IIFE for you loop.

Also if you are doing an await, its better to save the value of that promise in a variable and then using that variable instead of using a .then.

I also have a feeling that this error is because of your code missing a promise during execution. Because of that the for loop finishes before your complete code is executed. Thus the test passes but the exception fails.

Async Await Typescript Cucumber assertion fails with UnhandledPromiseRejectionWarning: AssertionError: but the test itself still passes

1 Answers1