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logger.service.spec.ts
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logger.service.spec.ts
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import { ErrorHandler, ReflectiveInjector } from '@angular/core';
import { Logger } from './logger.service';
describe('logger service', () => {
let logSpy: jasmine.Spy;
let warnSpy: jasmine.Spy;
let logger: Logger;
let errorHandler: ErrorHandler;
beforeEach(() => {
logSpy = spyOn(console, 'log');
warnSpy = spyOn(console, 'warn');
const injector = ReflectiveInjector.resolveAndCreate([
Logger,
{ provide: ErrorHandler, useClass: MockErrorHandler }
]);
logger = injector.get(Logger);
errorHandler = injector.get(ErrorHandler);
});
describe('log', () => {
it('should delegate to console.log', () => {
logger.log('param1', 'param2', 'param3');
expect(console.log).toHaveBeenCalledWith('param1', 'param2', 'param3');
});
});
describe('warn', () => {
it('should delegate to console.warn', () => {
logger.warn('param1', 'param2', 'param3');
expect(console.warn).toHaveBeenCalledWith('param1', 'param2', 'param3');
});
});
describe('error', () => {
it('should delegate to ErrorHandler', () => {
const err = new Error('some error message');
logger.error(err);
expect(errorHandler.handleError).toHaveBeenCalledWith(err);
});
});
});
class MockErrorHandler implements ErrorHandler {
handleError = jasmine.createSpy('handleError');
}