import { ApplicationError } from './application_error';

describe('ApplicationError', () => {

it('check inheritance tree', () => {

const err = new ApplicationError();

expect(err instanceof Error).toBeTruthy();

expect(err instanceof ApplicationError).toBeTruthy();

});

it('should set default error message', () => {

const err = new ApplicationError();

expect(err).toHaveProperty('message');

expect(typeof err.message).toBe('string');

expect(err.message).toBe('ApplicationError');

});

it('should set custom error message', () => {

const err = new ApplicationError('MyErrorMessage');

expect(err).toHaveProperty('message');

expect(typeof err.message).toBe('string');

expect(err.message).toBe('MyErrorMessage');

});

it('should set default error code', () => {

const err = new ApplicationError();

expect(err).toHaveProperty('code');

expect(typeof err.code).toBe('string');

expect(err.code).toBe('E_APPLICATION_ERROR');

});

it('should set custom error code', () => {

const err = new ApplicationError(undefined, { code: 'E_CUSTOM_ERROR' });

expect(err).toHaveProperty('code');

expect(typeof err.code).toBe('string');

expect(err.code).toBe('E_CUSTOM_ERROR');

});

it('should set default cause (undefined)', () => {

const err = new ApplicationError();

expect(err).toHaveProperty('cause');

expect(typeof err.cause).toBe('undefined');

expect(err.cause).toBe(undefined);

});

it('should set custom cause (another application error)', () => {

const cause = new ApplicationError(undefined, { code: 'E_CAUSE' });

const err = new ApplicationError(undefined, { cause });

expect(err).toHaveProperty('cause');

expect(err.cause instanceof ApplicationError).toBeTruthy();

expect((err.cause as ApplicationError).code).toBe('E_CAUSE');

});

});