calculator.service.spec.ts

import {CalculatorService} from './calculator.service';
import {LoggerService} from './logger.service';
import {TestBed} from '@angular/core/testing';


describe('CalculatorService', () => {

    let calculator: CalculatorService,
        loggerSpy: any;

    beforeEach(() => {

        console.log("Calling beforeEach");

        loggerSpy = jasmine.createSpyObj('LoggerService', ["log"]);

        // calculator = new CalculatorService(loggerSpy);

        TestBed.configureTestingModule({
            providers: [
                CalculatorService,
                {provide: LoggerService, useValue: loggerSpy}
            ]
        });

        calculator = TestBed.inject(CalculatorService);

    });

    it('should add two numbers', () => {

        // const logger = new LoggerService();

        // const logger = jasmine.createSpyObj('LoggerService', ["log"]);

        // spyOn(logger, 'log')

        // const calculator = new CalculatorService(logger);

        const result = calculator.add(2, 2)

        expect(result).toBe(4)

        console.log("add test");

        // const result = calculator.add(2, 2);

        // expect(result).toBe(4);

        expect(loggerSpy.log).toHaveBeenCalledTimes(1);

    });


    it('should subtract two numbers', () => {

        // const calculator = new CalculatorService(new LoggerService());

        // const logger = jasmine.createSpyObj('LoggerService', ["log"]);

        // spyOn(logger, 'log')

        // const calculator = new CalculatorService(logger);

        const result = calculator.subtract(2, 2)

        expect(result).toBe(0, "unexpected subtraction result")

        console.log("subtract test");

        // const result = calculator.subtract(2, 2);

        // expect(result).toBe(0, "unexpected subtraction result");

        expect(loggerSpy.log).toHaveBeenCalledTimes(1);

    });

});