The Karma test suite is encountering issues with the following message:
Disconnected, because no message in 10000 ms.
The tests are not running properly.
"@angular/core": "7.1.3",
"jasmine-core": "3.3.0",
"karma-jasmine": "1.1.2",
The failure seems to have occurred unexpectedly after a recent test addition.
After facing an identical issue and attempting various solutions without success, I finally found the one thing that worked - adding a specific option to my karma.conf.js:
browserNoActivityTimeout: 400000
Encountered a similar issue while using Chrome version 85.0.4183. I am uncertain as to why Karma lost connection with the browser, resulting in the message "Disconnected, because of no message in 30000 ms."
To resolve this, I made adjustments to my Karma.conf file:
captureTimeout: 210000,
browserDisconnectTolerance: 3,
browserDisconnectTimeout : 210000,
browserNoActivityTimeout : 210000
After making these changes, the issue was resolved. Hopefully, this solution is helpful for you as well.
When setting the TypeScript compiler option --module to commonjs in the tsconfig.spec.json file, Karma experiences internal failures before running any tests and displays a timeout error.
Karma may fail due to import ordering:
import CustomerTypeEnum = CustomerDto.CustomerTypeEnum;
import {CustomerDto} from '../api/CustomerDto';
To prevent this issue, ensure the correct import order:
import {CustomerDto} from '../api/CustomerDto';
import CustomerTypeEnum = CustomerDto.CustomerTypeEnum;
Alternatively, changing the module compiler option to something like es2015 can also resolve the problem.
My experience was unsuccessful as a result of my attempt to set window.location.href in the component. Instead of failing during the test for my component, the test run would randomly hang at times.
Make sure to review the karma log, as it may indicate a timeout error instead of the actual compilation errors when there are issues in test files.
After updating the basic Angular libraries, I noticed that the Chrome driver started to function correctly.
"devDependencies": {
"@angular-devkit/build-angular": "15.1.1", #previous version
"@angular-devkit/build-angular": "^15.2.10", #updated version
"@angular/cli": "15.1.1", #previous version
"@angular/cli": "^15.2.10", #updated version
If you require more time than the default jasmine time limit, you can insert the following code:
beforeEach(async(() => {
jasmine.DEFAULT_TIMEOUT_INTERVAL = <specify the necessary test completion time>;
}));
You can also refer to this answer on Stack Overflow if the above solution does not work for you:
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