cfc/cfc-frontend/__tests__/utils/fontScale.test.js

/**
 * fontScale 工具函数单元测试
 * 覆盖：微信系统字号读取 / 用户设置优先级 / 值域钳制 / storage 互斥 / mp-html tag-style 生成
 */
import {
  readSystemFontScale,
  getUserFontScale,
  setUserFontScale,
  getFontScale,
  syncFontScale,
  buildContentTagStyle
} from '@/utils/fontScale.js'

// 每个用例前清空 mock storage，并给出可控的 getAppBaseInfo
beforeEach(() => {
  global.uni._storage = {}
  global.uni.getAppBaseInfo = jest.fn(() => ({}))
})

describe('readSystemFontScale', () => {
  it('优先返回 fontSizeScaleFactor', () => {
    global.uni.getAppBaseInfo = jest.fn(() => ({ fontSizeScaleFactor: 1.25, fontSizeSetting: 20 }))
    expect(readSystemFontScale()).toBe(1.25)
  })

  it('无 factor 时用 fontSizeSetting / 16 兜底', () => {
    global.uni.getAppBaseInfo = jest.fn(() => ({ fontSizeSetting: 20 }))
    expect(readSystemFontScale()).toBeCloseTo(1.25, 5)
  })

  it('两者都缺省时返回 1', () => {
    expect(readSystemFontScale()).toBe(1)
  })

  it('API 抛异常时返回 1', () => {
    global.uni.getAppBaseInfo = jest.fn(() => { throw new Error('low lib') })
    expect(readSystemFontScale()).toBe(1)
  })
})

describe('setUserFontScale / getUserFontScale', () => {
  it('设置后能读回，且保留两位小数', () => {
    setUserFontScale(1.1234)
    expect(getUserFontScale()).toBe(1.12)
  })

  it('超出上界钳制到 1.7', () => {
    expect(setUserFontScale(5)).toBe(1.7)
  })

  it('低于下界钳制到 0.9', () => {
    expect(setUserFontScale(0.1)).toBe(0.9)
  })

  it('未设置时返回 null', () => {
    expect(getUserFontScale()).toBeNull()
  })

  it('非法值（0 / NaN）返回 null', () => {
    global.uni.setStorageSync('userFontScale', 0)
    expect(getUserFontScale()).toBeNull()
    global.uni.setStorageSync('userFontScale', NaN)
    expect(getUserFontScale()).toBeNull()
  })
})

describe('getFontScale 优先级', () => {
  it('用户手动设置优先于系统字号', () => {
    global.uni.setStorageSync('fontSizeScaleFactor', 1.5)
    setUserFontScale(1)
    expect(getFontScale()).toBe(1)
  })

  it('用户未设置时使用缓存中的系统值', () => {
    global.uni.setStorageSync('fontSizeScaleFactor', 1.3)
    expect(getFontScale()).toBe(1.3)
  })

  it('缓存也没有时实时读系统', () => {
    global.uni.getAppBaseInfo = jest.fn(() => ({ fontSizeScaleFactor: 1.4 }))
    expect(getFontScale()).toBe(1.4)
  })

  it('全部缺失时返回 1', () => {
    expect(getFontScale()).toBe(1)
  })
})

describe('syncFontScale', () => {
  it('用户未设置时把系统值写入缓存', () => {
    global.uni.getAppBaseInfo = jest.fn(() => ({ fontSizeScaleFactor: 1.6 }))
    syncFontScale()
    expect(global.uni._storage.fontSizeScaleFactor).toBe(1.6)
  })

  it('用户已设置时不覆盖缓存', () => {
    setUserFontScale(1.2)
    global.uni.setStorageSync('fontSizeScaleFactor', 1.6)
    global.uni.getAppBaseInfo = jest.fn(() => ({ fontSizeScaleFactor: 1.6 }))
    syncFontScale()
    expect(global.uni._storage.fontSizeScaleFactor).toBe(1.6)
  })
})

describe('buildContentTagStyle', () => {
  it('按 scale 放大正文字号（rpx）', () => {
    const style = buildContentTagStyle(32, 1.25)
    expect(style.p).toBe('font-size:40rpx;color:#444;line-height:1.8;')
    expect(style.div).toBe('font-size:40rpx;color:#444;line-height:1.8;')
    expect(style.section).toBe('font-size:40rpx;color:#444;line-height:1.8;')
    expect(style.li).toBe('font-size:40rpx;color:#444;line-height:1.8;')
  })

  it('scale 缺省按 1 处理', () => {
    expect(buildContentTagStyle(28).p).toBe('font-size:28rpx;color:#444;line-height:1.8;')
  })

  it('包含常用块级标签', () => {
    const keys = Object.keys(buildContentTagStyle(28, 1))
    expect(keys).toEqual(expect.arrayContaining(['p', 'div', 'section', 'li', 'blockquote']))
  })
})