在 Angular 7.x 中,我有一个全局错误处理,可以使用注入器注入他的服务。因此每个函数都有一个对注入器的引用,如下所示:
import { ErrorHandler, Injectable, Injector, NgZone } from '@angular/core';
import { Router } from '@angular/router';
import { LoggingService } from '../logging/logging.service';
import { EnvironmentService } from '../services/environment.service';
@Injectable()
export class GlobalErrorHandler implements ErrorHandler {
constructor(private readonly injector: Injector, private readonly zone: NgZone) {}
handleError(error: any): void {
// Handle Client Error (Angular Error, ReferenceError...)
this.processError(error);
throw error;
}
processError(error: any): void {
const environmentService = this.injector.get(EnvironmentService);
const environment = environmentService.getEnvironment();
if (!environment.production) {
console.error(error);
} else {
// Log the expection to the logger
this.logException(error);
this.zone.run(() => {
this.navigateToErrorPage(error);
});
}
}
private logException(error: any): void {
const loggingService = this.injector.get(LoggingService);
loggingService.logException(error);
}
private navigateToErrorPage(error: any): void {
const router = this.injector.get(Router);
router.navigate(['/500'], { queryParams: { error } });
}
}
如您所见,在processError
函数我注入环境服务。该服务的唯一目标是能够在我的规范测试中模拟环境。我在另一个服务测试中执行此操作,但我将其与依赖项注入一起使用,而不是与this.injector.get(...)
功能。
有谁知道我是如何嘲笑这个的?
it('should log the error if the environment is in production', () => {
// Arrange
const environmentSpy = jasmine.createSpyObj('EnvironmentService', 'getEnvironment'); ??? How do I mock this ???
const error: Error = new Error('New Error');
spyOn<any>(errorHandler, 'logException');
// Act
errorHandler.processError(error);
// Assert
expect(errorHandler['logException']).toHaveBeenCalledWith(error);
});
您可以监视 Injector 并返回一个假类来代替具有自定义的 EnvironmentServicegetEnvironment()
method:
spyOn(TestBed.get(Injector), 'get').and.callFake((token) => {
if (token === EnvironmentService) {
// Return a mocked EnvironmentService class
return {
getEnvironment: () => { return { production: true }; }
};
} else {
// Otherwise, return whatever was originally defined in the TestBed
return TestBed.get(token);
}
});
或者,您可以使用真正的注入器并监视环境服务:
spyOn(TestBed.get(EnvironmentService), 'getEnvironment').and
.returnValue({ production: true });
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