Unhandled Promise Rejection Karma. With karma 6. It appears that the errors is being caused when d
With karma 6. It appears that the errors is being caused when delaying the destroy via the setImmediate. onComplete', '; Value:', TypeError: Cannot Karma TestBed. 4. ERROR: 'Unhandled Promise rejection:', 'Cannot match any routes. configureTestingModule: Unit Tests pass, but raise ERROR: 'Unhandled Promise rejection:', 'invalid link: LoginPage' Asked 6 years, 8 months ago Modified So it applies a simple rule: whenever control is returned to the runtime, an unhandled rejection event is fired for every promise that has been rejected and not awaited (or . As you can see from my comment in I was seeing this when I had a util file with a Promised API call, a component that calls it but wasn't explicitly handling the . then -d). all call. 🚨 This can lead to silent failures, crashes, and hard-to-debug issues. Let's take a look at what you should do when there is an Here, despite common understanding that the promises will reside in pending state during and after the for loop and would "really" start to execute only after Promise. I am trying to implement a test (1) for this module (2). By consistently handling these When I run ng test command in my angular project has error, it gives an error like that 10% building modules 1/1 modules 0 active04 12 2018 11:29:43. js:690 Unhandled Promise rejection: Cannot read properties of undefined How can I configure a spy to return a rejected promise without triggering an unhandled promise rejection error? How can I mock AJAX/fetch/XMLHTTPRequest calls? Why can't I spy on 'Unhandled Promise rejection:', 'Cannot read properties of undefined (reading 'then')', '; Zone:', 'ProxyZone', '; Task:', 'jasmine. 3. Unhandled promise rejection: Error: Injector has already been destroyed Asked 3 years, 6 months ago Modified 11 months ago Viewed 32k times Karma - Jasmine, Unhandled promise rejection: Error: Could not load "util" Asked 3 years, 10 months ago Modified 3 years, 10 months ago Viewed 1k times The states of JavaScript promises can be pending, fulfilled, or rejected. catch, and a Jest that was mocking up a Unhandled Promise rejection: Cannot read properties of null (reading 'clientHeight') ; Zone: <root> ; Task: Promise. You're possibly running into this issue on jasmine a dependency of karma. It appears that this I am struggling with Angular Unit test on running "ng test", I get the below error in terminal. They had changed their error detection logic so that it started reporting unhandled rejections that Many developers have been haunted by the elusive “unhandled promise rejection” — a problem that can quietly undermine even the most robust applications. It Today when I ran ng test on a project on Karma 4. I'm currently encountering a problem when using jasmine test with promises. onComplete" with async/forEach #3124 Closed maplion opened this issue on Aug 31, I'm looking into some code however when running the test i came across these errors: - zone. The same code worked fine The unhandledrejection event is sent to the global scope of a script when a JavaScript Promise that has no rejection handler is rejected; typically, this is the window, but Fix 'Promise Rejection (Unhandled)' error in JavaScript fast! Learn causes, solutions, and code examples in this 2025 guide for Unhandled Promise Rejections occur when a rejected promise is not properly handled. URL Which @angular/* package(s) are the source of the bug? compiler-cli, compiler, core, router Is this a regression? Yes Description Karma-Jasmine Returning "Unhandled Promise rejection" on Task: "jasmine. then ; Value: TypeError: Cannot read properties of null (reading . My purpose is to check if the collection is fetched when a particular event is triggered. A promise is handled when something is done in reaction to that promise, even if it's creating another rejected promise, or turning a Unhandled Promise Rejections can be a significant source of frustration in JavaScript development. 3, I'm getting an Unhandled promise rejection error, which looks like a false positive to me. 408:WARN [karma Since the default settings for karma run the tests randomly and also parallel (depending on the configuration), logs can be messed up. 1, I got the following error [karma-server]: UnhandledRejection and the tests stopped midway - "Executed 26 of 1371". The error is 'Unhandled Promise rejection:' which mean my promise don't handle catch() and then() @CL-BayanAbuawad, had a look at the reproduction.