Oli Sturm
55 lines
1.9 KiB
JavaScript
55 lines
1.9 KiB
JavaScript
import { describe, it, expect } from 'vitest';
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import { openAccount, withdraw } from '../js-fp3/domain/account.js';
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import { createMoney } from '../js-fp3/domain/money.js';
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describe('account domain', () => {
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it('opening an account with a negative balance returns openingBalanceMustBeNonNegative', () => {
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const result = openAccount('id-1', createMoney(-1));
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expect(result.error.type).toBe('OpeningBalanceMustBeNonNegative');
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});
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it('withdrawing a zero amount returns amountMustBePositive', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const result = withdraw(account, createMoney(0));
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expect(result.error.type).toBe('AmountMustBePositive');
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});
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it('withdrawing a negative amount returns amountMustBePositive', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const result = withdraw(account, createMoney(-10));
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expect(result.error.type).toBe('AmountMustBePositive');
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});
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it('withdrawing more than the balance returns insufficientBalance', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const result = withdraw(account, createMoney(101));
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expect(result.error.type).toBe('InsufficientBalance');
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});
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it('insufficientBalance error reports the current balance and attempted amount', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const error = withdraw(account, createMoney(150)).error;
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expect(error.type).toBe('InsufficientBalance');
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expect(error.balance.amount).toBe(100);
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expect(error.amount.amount).toBe(150);
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});
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it('successive withdrawals are each applied to the running balance', () => {
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const account = openAccount('id-1', createMoney(300)).value;
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const updatedAccount1 = withdraw(account, createMoney(100)).value;
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const updatedAccount2 = withdraw(updatedAccount1, createMoney(100)).value;
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expect(updatedAccount2.balance.amount).toBe(100);
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});
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});
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