Karma 断开连接，因为 10000 毫秒内没有消息

Question

The Karma test suite fails with the message:

Disconnected, because no message in 10000 ms.

No tests are executed at all.

"@angular/core": "7.1.3",
"jasmine-core": "3.3.0",
"karma-jasmine": "1.1.2",

There is no apparent reason for the failure, it just started after a new test was introduced.

Answer 1

我遇到了同样的问题并尝试了所有方法 - 除了将此选项添加到我的karma.conf.js之外没有任何效果：

browserNoActivityTimeout: 400000

Answer 2

When the --module compiler option for TypeScript in tsconfig.spec.json is set to commonjs Karma fails internally before any tests are executed and shows the timeout error above.

The import ordering can let Karma fail:

import CustomerTypeEnum = CustomerDto.CustomerTypeEnum;
import {CustomerDto} from '../api/CustomerDto';

While this order works as expected:

import {CustomerDto} from '../api/CustomerDto';
import CustomerTypeEnum = CustomerDto.CustomerTypeEnum;

The problem can also be fixed by changing the module compiler option to eg es2015 .

Answer 3

它对我来说失败了，因为我在我的组件中设置了 window.location.href，但是测试运行只是在随机时间挂起，而不是在我的组件测试中失败。

Answer 4

I had a similar problem on Chrome 85.0.4183. I don't know why Karma lose connection with browser and I get "Disconnected, because of no message in 30000 ms."

I've add this to Karma.conf:

captureTimeout: 210000,
browserDisconnectTolerance: 3, 
browserDisconnectTimeout : 210000,
browserNoActivityTimeout : 210000

now it works, hope this will help you

Answer 5

查看 karma 的日志，当测试文件中有编译错误时，karma 服务器返回超时错误而不是真正的错误

Answer 6

You can add this where you have need greater time than jasmine default time.

  beforeEach(async(() => {
    jasmine.DEFAULT_TIMEOUT_INTERVAL = <whatever time your test need to complete>;
  }));

and also you can check this answer if this not working. https://stackoverflow.com/a/37969873/1931563