JavaScript - kolejny test w JEST (TDD)

Opublikowano śro 10 czerwca 2020 w testy • 2 min read

jest

Poniższy wpis powstał na podstawie tego materiału, patrz również tutaj i jego założeniem jest próbą wprowadzenia do TDD (test driven development). W pierwszej kolejności znane są wytyczne/scenariusz funkcji następnie powstaje test a na jego podstawie funkcja

Zadanie stwórz funkcję spełniającą następujące warunki

1. Bob answers 'Sure.' if you ask him a question.

2. He answers 'Whoa, chill out!' if you yell at him.

3. He retorts 'Calm down, I know what I'm doing!' if you yell a question at him.

4. He says 'Fine. Be that way!' if you address him without actually saying anything.

5. He answers 'Whatever.' to anything else.

Test 1

talkToBob.test.js

const talkToBob = require('./talkToBob');

test("answers Sure, if ask him a question", () => {
  expect(talkToBob("How are You?")).toBe("Sure")
});

talkToBob.js

function talkToBob(info = "") {
  if(info.endsWith("?")) return "Sure";
};

module.exports = talkToBob;

Test 2

talkToBob.test.js

const talkToBob = require('./talkToBob');

describe('Function - talkToBob', () => {
  test("answers Sure, if ask him a question", () => {
    expect(talkToBob("How are You?")).toBe("Sure")
  });
  test("Answers 'Whoa, chill out!' if you yell at him", () => {
    expect(talkToBob("WHAT?")).toBe("Whoa, chill out!")
  });
});

talkToBob.js

function talkToBob(info = "") {
  if(info.endsWith("?") && info !== info.toUpperCase()) return "Sure";
  if(info === info.toUpperCase()) return "Whoa, chill out!";
};

module.exports = talkToBob;

Test 3

talkToBob.test.js

const talkToBob = require('./talkToBob');

describe('Function - talkToBob', () => {
  test("answers Sure, if ask him a question", () => {
    expect(talkToBob("How are You?")).toBe("Sure")
  });
  test("Answers 'Whoa, chill out!' if you yell at him", () => {
    expect(talkToBob("DON'T")).toBe("Whoa, chill out!")
  });
  test("He retorts 'Calm down, I know what I'm doing!' if you yell a question at him.", () => {
    expect(talkToBob("WHAT?")).toBe("Calm down, I know what I'm doing!")
  });
});

talkToBob.js

function talkToBob(info = "") {
  if(info.endsWith("?") && info !== info.toUpperCase()) return "Sure";
  if(info === info.toUpperCase() && !info.endsWith("?")) return "Whoa, chill out!";
  if(info.endsWith("?")) return "Calm down, I know what I'm doing!";
  if(info === "") return "Fine. Be that way!";
  else return 'Whatever.'
};

module.exports = talkToBob;

Test 4-5

talkToBob.test.js

const talkToBob = require('./talkToBob');

describe('Function - talkToBob', () => {
  test("answers Sure, if ask him a question", () => {
    expect(talkToBob("How are You?")).toBe("Sure")
  });
  test("Answers 'Whoa, chill out!' if you yell at him", () => {
    expect(talkToBob("DON'T")).toBe("Whoa, chill out!")
  });
  test("He retorts 'Calm down, I know what I'm doing!' if you yell a question at him.", () => {
    expect(talkToBob("WHAT?")).toBe("Calm down, I know what I'm doing!")
  });
  test("He says 'Fine. Be that way!' if you address him without actually saying anything.", () => {
    expect(talkToBob("")).toBe('Fine. Be that way!')
  });
  test("He answers 'Whatever.' to anything else.", () => {
    expect(talkToBob("whatever")).toBe('Whatever.')
  });
});

talkToBob.js

function talkToBob(info = "") {
  if(info.endsWith("?") && info !== info.toUpperCase()) return "Sure";
  if(info === info.toUpperCase() && !info.endsWith("?") && info.length !== 0 ) return "Whoa, chill out!";
  if(info.endsWith("?")) return "Calm down, I know what I'm doing!";
  if(info === "") return "Fine. Be that way!";
  else return 'Whatever.'
};

module.exports = talkToBob;

::: Niezastosowanie przy drugim warunku && info.length !== 0 a wprowadzenie dowolnej wartości jako domyślnej wprowadzanego, który stanie się wywołaniem czwartego warunku nie spełni wymogu założonego przez piąty test:::

Źródła:

https://jestjs.io/

https://www.youtube.com/watch?v=gX440uva4NU

https://medium.com/javascript-scene/tdd-changed-my-life-5af0ce099f80 --TDD