Angular tests failing with Failed to execute 'send' on 'XMLHttpRequest'
This is a problem of the new Angular Cli. Run your test with --sourcemaps=false and you will get the right error messages.
See details here: https://github.com/angular/angular-cli/issues/7296
EDIT:
Shorthand for this is:
ng test -sm=false
As of angular 6 the command is:
ng test --source-map=false
I had the same issue using angualar cli 6, I have used this tag to get the right error message :
ng test --source-map=falseMaybe it will help someone :) .
For my case there was a mock data problem and in case of Array, I was returning string from the mock.
someApi = fixture.debugElement.injector.get(SomeApi);spyOn(someApi, 'someMethod') .and.returnValue(Observable.of('this is not a string but array'));The error message is really distracting and was not telling the actual error. Running
ng test --source=falsepointed the correct error and line, and helped me to fix it quickly.
Many time it happens when you mock data is incomplete or incorrect.