promisify() doesn't work together with cypress-cucumber-preprocessor

[johnknoop]

Hi!

I'm using the Cypress plugin cypress-cucumber-preprocessor which lets you write Cypress tests in BDD format.

It means you have your .feature file that expresses your test scenarios, and then you have js/ts files where you define your "step definitions" that are effectively just the where you implement the test code.

So in order to have a step definition for the step When I do xxx, you add this code:

When('I do xxx', function () {
    // Implement step
});

These step definition functions may be async as well. For example, this works:

// my-working-spec.ts

When('some step', async function () {
	const data = await new Promise(resolve => {
		setTimeout(() => {
			resolve('mock data');
		}, 1000);
	});
	console.log(data);
});

So cypress-cucumber-preprocessor seems to be able to handle async step definitions just fine.

But when I use promisify like this;

// my-failing-spec.ts

import promisify from 'cypress-promise';

When('some step', async function () {
	const data = await promisify(cy.task('LoadDataFromDatabase'));
	console.log(data);
});

then I get this error:

I'm not super versed in the internals of Cypress, so it's hard for me to tell where it goes wrong, but the fact that other async step definitions work fine suggests that it's something to do with cypress-promise.

[richardszanyi-kasa]

Up, encountered the same problem here.