webamp/js/__tests__/Band-test.js

import {
  spriteNumber,
  spriteOffsets
} from '../components/Band';

describe('spriteNumber', () => {
  it('gives the first sprite', () => {
    const actual = spriteNumber(0);
    const expected = 0;
    expect(actual).toEqual(expected);
  });
  it('gives the middle sprite', () => {
    const actual = spriteNumber(50);
    const expected = 14;
    expect(actual).toEqual(expected);
  });
  it('gives the last sprite', () => {
    const actual = spriteNumber(100);
    const expected = 27;
    expect(actual).toEqual(expected);
  });
});

describe('spriteOffsets', () => {
  it('gives the first sprite', () => {
    const actual = spriteOffsets(0);
    const expected = {x: 0, y: 0};
    expect(actual).toEqual(expected);
  });
  it('gives the middle sprite', () => {
    const actual = spriteOffsets(14);
    const expected = {x: 0, y: 1};
    expect(actual).toEqual(expected);
  });
  it('gives the last sprite', () => {
    const actual = spriteOffsets(27);
    const expected = {x: 13, y: 1};
    expect(actual).toEqual(expected);
  });
});