E/launcher - Error: TypeError: Cannot read property 'children' of undefined , Causing Report to generate empty results! #518
Comments
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Hey @mtahat and thanks for the detailed report! This looks like a synchronisation issue that typically happens if the cucumber step does not return the For example, the below sample would cause a synchronisation issue: Given(/some step/, () => {
// note no `return` statement:
actorInTheSpotlight().attemptsTo(/*... tasks ...*/);
});While both the below samples would work correctly: Given(/some step/, () => {
// explicit `return` statement
return actorInTheSpotlight().attemptsTo(/*... tasks ...*/);
});// `return` is implied with one-liner fat arrow functions with no curly brackets
Given(/some step/, () => actorInTheSpotlight().attemptsTo(
/*... tasks ...*/
));Could you please have a look at your cucumber steps implementation and check if they are synchronised with Serenity/JS actor flow (the Best, |
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@jan-molak Thank you for your suggestion. Step file: Tasks in UseTopNav |
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Could you please add a StreamReporter to your // protractor.conf.js
const { StreamReporter } = require('@serenity-js/core');
const fs = require('fs');
module.exports = {
crew: [
new StreamReporter(fs.createWriteStream('./events.ndjson'))
// other crew members
],
// other config
};Also, I noticed that the timeouts for your waits are really long - 15 and 5 seconds, which might be reasonable if the system under test is this slow. However, if that's the case then it's possible that your cucumber step times out before your Serenity/JS tasks. Check out my post on StackOverflow. If you want to adjust your cucumber step timeout, try the following: When(/(?:he|she|user) hovers over (.*) and clicks (.*)/, { timeout: 30 * 1000 }, (arg1: string, arg2: string) =>
actorInTheSpotlight().attemptsTo(
UseTopNav.with(arg1, arg2),
)); |
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@jan-molak Yes, our website is so slow! some of the wait statements goes up to 1 minute! I will also add the Stream reporter to my config file and run again. |
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@jan-molak I tried to increase the cucumber timeout as suggested, I added Protractor.config timeout.ts Here is the output of my StreamReporter-- FYI: the tests fails when I run: npm test ( around 25 tests will run) and the report will show empty results as above..
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Thanks, @mtahat, based on the events log, it definitely looks like a synchronisation problem. If you analyse the event log you'll see: So this corresponds to this sequence of tasks: But then I see an end of the following task, instead of the end of the wait interaction I'd expect: So it feels like whatever wraps the wait of 15 seconds does not have a sufficient timeout. I'd suggest:
It's difficult for me to suggest more without seeing your actual code base and the system itself. |
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Yup I agree..it is indeed sync issue! I pumped up the cucumber time out and it seemed to be more stable. I am considering integrating a service virtualization tool (hoverfly) to eliminate some of the flakiness in the backend. I will add an actor who can send API calls and see how stable the service even before running the test.. Again, Thank you so much for your quick responses! I am closing this issue since it is not related to serenity js. |
…rter In cases where Cucumber interrupts execution of an already started Serenity/JS activity (i.e. when a Cucumber step times out before actor finishes what they're doing), some internal domain events could arrive during the subsequnt scenario, confusing SerenityBDDReporter and making it throw a bit of a cryptic error along the lines of "Cannot read property 'children' of undefined". This new implementation of the reporter resolves this issue by aggregating scenario-specific events before they're analysed, making sure they're ordered correctly, and generating the report only when all the events are available. Closes #518
Hello @jan-molak I am using Serenity-js with Cucumber, protractor & typescript ( see dependencies below) , I also have a hook.js that cleans the locale storage session after each feature/scenario. (see below).
I start getting Empty Reports after failed runs, I noticed this issue happen when the test timeout durning the execution ( for example the task code has wait.upto(Durations.seconds(60), " See task below")
FYI: I used the template cucumber/serenity template that you have here to build my project. see dependencies below, I am also using Mac book, VS Code IDE.
Exception 1: TypeError Cannot read property
Exception 2: TypeError: Cannot read property 'screenshots' of undefined
Task Used to Hover over top menu bar then click on sub-menu
Hooks.ts
Dependencies
Protractor.config
Empty Report after test is done
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