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Train Driver: Prevent deleting object property #2674

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merged 1 commit into from
Jun 13, 2025
Merged

Train Driver: Prevent deleting object property #2674

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26 changes: 17 additions & 9 deletions exercises/concept/train-driver/train-driver.spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,17 @@ function list(...values) {
return new LimitedArray(values);
}

function time(timeOfArrival, route) {
Object.defineProperty(route, 'timeOfArrival', {
configurable: false,
writable: false,
enumerable: true,
value: timeOfArrival,
});

return route;
}

describe('getListOfWagons', () => {
test('returns the correct array', () => {
expect(getListOfWagons(1, 5, 2, 7, 4)).toEqual([1, 5, 2, 7, 4]);
Expand Down Expand Up @@ -181,13 +192,12 @@ describe('extendRouteInformation', () => {

describe('separateTimeOfArrival', () => {
test('separates timeOfArrival from complete object', () => {
const route = {
const route = time('12:00', {
from: 'Berlin',
to: 'Hamburg',
timeOfArrival: '12:00',
precipitation: '10',
temperature: '5',
};
});

const expected = [
'12:00',
Expand All @@ -198,12 +208,11 @@ describe('separateTimeOfArrival', () => {
});

test('separates timeOfArrival with smaller object', () => {
const route = {
const route = time('10:30', {
from: 'Paris',
to: 'London',
timeOfArrival: '10:30',
temperature: '20',
};
});

const expected = [
'10:30',
Expand All @@ -214,13 +223,12 @@ describe('separateTimeOfArrival', () => {
});

test('separates timeOfArrival from differently ordered object', () => {
const route = {
const route = time('21:20', {
from: 'Gothenburg',
to: 'Copenhagen',
precipitation: '1',
timeOfArrival: '21:20',
temperature: '-6',
};
});

const expected = [
'21:20',
Expand Down