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

import { TICKS_PER_REVOLUTION, useMotor } from 'src/composables/motor';
import { describe, expect, test } from 'vitest';
import { nextTick, ref } from 'vue';
import { toggleTickAsync, usePulseCount } from '../utils';

describe('motor', () => {
  test('starts in the off state', () => {
    const isOn = ref(false);
    const tick = ref(false);

    const { pulse } = useMotor(tick, isOn);
    const { pulseCount } = usePulseCount(pulse);

    expect(pulseCount.value).toBe(0);
  });

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

    const { pulse } = useMotor(tick, isOn);
    const { pulseCount } = usePulseCount(pulse);

    for (let i = 0; i < 3 * TICKS_PER_REVOLUTION; i++) {
      await toggleTickAsync(tick);
    }
    expect(pulseCount.value).toBe(0);
  });

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

    const { pulse } = useMotor(tick, isOn);
    const { pulseCount } = usePulseCount(pulse);

    for (let i = 0; i < 3 * TICKS_PER_REVOLUTION; i++) {
      await toggleTickAsync(tick);

      const expectedValue = Math.floor((i + 1) / TICKS_PER_REVOLUTION);
      expect(pulseCount.value).toBe(expectedValue);
    }
  });

  test('stops pulsing when turned off', async () => {
    const tick = ref(false);
    const isOn = ref(true);

    const { pulse } = useMotor(tick, isOn);
    const { pulseCount } = usePulseCount(pulse);

    for (let i = 0; i < 3 * TICKS_PER_REVOLUTION; i++) {
      await toggleTickAsync(tick);

      const expectedValue = Math.floor((i + 1) / TICKS_PER_REVOLUTION);
      expect(pulseCount.value).toBe(expectedValue);
    }

    const pulseValueAtStop = pulseCount.value;

    isOn.value = false;
    await nextTick();

    for (let i = 0; i < 3 * TICKS_PER_REVOLUTION; i++) {
      toggleTickAsync(tick);
    }

    expect(pulseCount.value).toBe(pulseValueAtStop);
  });
});