bank_account.test.js

const {credit, debit} = require("../../src/liskov_substitution/bank_account");

const bankAccountTest = (account, credit, debit) => {

    it('credit account', () => {
        const credited = credit({...account, balance: 0}, 50);
        expect(credited.balance).toBe(50);
    })

    it('debit account with sufficient funds', () => {
        const debited = debit({...account, balance: 50}, 50);
        expect(debited.balance).toBe(0);
    })

    it('debit account with insufficient funds', () => {
        expect(() => debit({...account, balance: 50}, 51)).toThrow('Insufficient funds error');
    })
}

describe("bank account", () => {
    const {credit, debit} = require("../../src/liskov_substitution/bank_account");
    const account = {id: 1, balance: 0};
    bankAccountTest(account, credit, debit);
})

describe("bank account with overdraft facility", () => {
    const overdraft_debit = require("../../src/liskov_substitution/overdraft_account");
    const overdraft_account = {id: 1, balance: 0, limit: 1000};
    bankAccountTest(overdraft_account, credit, overdraft_debit);
})