the-biscuit-machine/test/vitest/__tests__/biscuitOven.test.ts

import {
  HEATER_PLUS_DEGREES_PER_TICK,
  ROOM_TEMPERATURE,
  useBiscuitOven,
} from 'src/composables/biscuitOven';
import { test, expect } from 'vitest';
import { ref } from 'vue';
import { toggleTickAsync } from '../utils';

test('starts off at room temperature', () => {
  const tick = ref(false);
  const isOn = ref(false);

  const { currentTemperature } = useBiscuitOven(tick, isOn);
  expect(currentTemperature.value).toBe(ROOM_TEMPERATURE);
});

test('does not heat up when off', async () => {
  const tick = ref(false);
  const isOn = ref(false);

  const { currentTemperature } = useBiscuitOven(tick, isOn);

  await toggleTickAsync(tick, 10);

  expect(currentTemperature.value).toBe(ROOM_TEMPERATURE);
});

test('heats up when on', async () => {
  const tick = ref(false);
  const isOn = ref(true);

  const { currentTemperature } = useBiscuitOven(tick, isOn);

  const heatingUpTime = 10;
  await toggleTickAsync(tick, heatingUpTime);

  expect(currentTemperature.value).toBe(
    ROOM_TEMPERATURE + heatingUpTime * HEATER_PLUS_DEGREES_PER_TICK
  );
});

test('cools down to room temperature when turned off', async () => {
  const tick = ref(false);
  const isOn = ref(true);

  const { currentTemperature } = useBiscuitOven(tick, isOn);

  const heatingUpTime = 10;
  await toggleTickAsync(tick, heatingUpTime);

  expect(currentTemperature.value).toBe(
    ROOM_TEMPERATURE + heatingUpTime * HEATER_PLUS_DEGREES_PER_TICK
  );

  isOn.value = false;

  const cooldownTime = 1000;
  await toggleTickAsync(tick, cooldownTime);

  expect(currentTemperature.value).toBe(ROOM_TEMPERATURE);
});