Hi, Please help me with this question.

Problem Soulution source :

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Source Code problem 3 :

const { fixPostalCode } = require('./solutions'); describe('Problem 3 - fixPostalCode() function', function () { test('leading space is removed', function () { const postalCode = ' A1A 1A1'; expect(fixPostalCode(postalCode)).toEqual('A1A 1A1'); }); test('trailing space is removed', function () { const postalCode = 'A1A 1A1 '; expect(fixPostalCode(postalCode)).toEqual('A1A 1A1'); }); test('an internal space is added', function () { const postalCode = 'A1A1A1'; expect(fixPostalCode(postalCode)).toEqual('A1A 1A1'); }); test('lowercase letters are converted to UPPER case', function () { const postalCode = 'a1a 1a1'; expect(fixPostalCode(postalCode)).toEqual('A1A 1A1'); }); test('a postal code with too many characters throws an error', function () { const invalidPostalCode = 'A1A 1A11'; expect(() => fixPostalCode(invalidPostalCode)).toThrow(); }); test('a postal code with too few characters throws an error', function () { const invalidPostalCode = 'A1A'; expect(() => fixPostalCode(invalidPostalCode)).toThrow(); }); test('a postal code that starts with an invalid character throws an error', function () { // D, F, I, O, Q, W, U, Z are all invalid in the first position expect(() => fixPostalCode('D1A 1A1')).toThrow(); expect(() => fixPostalCode('F1A 1A1')).toThrow(); expect(() => fixPostalCode('I1A 1A1')).toThrow(); expect(() => fixPostalCode('O1A 1A1')).toThrow(); expect(() => fixPostalCode('Q1A 1A1')).toThrow(); expect(() => fixPostalCode('W1A 1A1')).toThrow(); expect(() => fixPostalCode('U1A 1A1')).toThrow(); expect(() => fixPostalCode('Z1A 1A1')).toThrow(); }); test('a postal code with a non-digit in the second position throws an error', function () { expect(() => fixPostalCode('DZA 1A1')).toThrow(); }); test('a postal code with an invalid character in the third position throws an error', function () { // D, F, I, O, Q, U are all invalid in the first position expect(() => fixPostalCode('A1D 1A1')).toThrow(); expect(() => fixPostalCode('A1F 1A1')).toThrow(); expect(() => fixPostalCode('A1I 1A1')).toThrow(); expect(() => fixPostalCode('A1O 1A1')).toThrow(); expect(() => fixPostalCode('A1Q 1A1')).toThrow(); // W is valid in this position expect(fixPostalCode('A1W 1A1')).toEqual('A1W 1A1'); expect(() => fixPostalCode('A1U 1A1')).toThrow(); // Z is valid in this position expect(fixPostalCode('A1Z 1A1')).toEqual('A1Z 1A1'); }); test('a postal code with a non-space or invalid character in the fourth position throws an error', function () { expect(() => fixPostalCode('AZA-1A1')).toThrow(); expect(() => fixPostalCode('AZA 1A1')).toThrow(); }); test('a postal code with a non-digit in the fifth position throws an error', function () { expect(() => fixPostalCode('AZAAA1')).toThrow(); expect(() => fixPostalCode('AZA A1')).toThrow(); }); test('a postal code with an invalid character in the sixth position throws an error', function () { // D, F, I, O, Q, U are all invalid in the sixth position expect(() => fixPostalCode('A1A 1D1')).toThrow(); expect(() => fixPostalCode('A1A 1F1')).toThrow(); expect(() => fixPostalCode('A1A 1I1')).toThrow(); expect(() => fixPostalCode('A1A 1O1')).toThrow(); expect(() => fixPostalCode('A1A 1Q1')).toThrow(); // W is valid in this position expect(fixPostalCode('A1A 1W1')).toEqual('A1A 1W1'); expect(() => fixPostalCode('A1A 1U1')).toThrow(); // Z is valid in this position expect(fixPostalCode('A1A 1Z1')).toEqual('A1A 1Z1'); }); test('a postal code with a non-digit in the seventh position throws an error', function () { expect(() => fixPostalCode('AZA AAG')).toThrow(); expect(() => fixPostalCode('AZA A1-')).toThrow(); }); }); 

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