atom/packages/one-light-ui/spec/theme-spec.js

const themeName = 'one-light-ui'

describe(`${themeName} theme`, () => {
  beforeEach(() => {
    waitsForPromise(() => atom.packages.activatePackage(themeName))
  })

  it('allows the font size to be set via config', () => {
    expect(document.documentElement.style.fontSize).toBe('12px')

    atom.config.set(`${themeName}.fontSize`, '10')
    expect(document.documentElement.style.fontSize).toBe('10px')
  })

  it('allows the tab sizing to be set via config', () => {
    atom.config.set(`${themeName}.tabSizing`, 'Maximum')
    expect(
      document.documentElement.getAttribute(`theme-${themeName}-tabsizing`)
    ).toBe('maximum')
  })

  it('allows the tab sizing to be set via config', () => {
    atom.config.set(`${themeName}.tabSizing`, 'Minimum')
    expect(
      document.documentElement.getAttribute(`theme-${themeName}-tabsizing`)
    ).toBe('minimum')
  })

  it('allows the tab close button to be shown on the left via config', () => {
    atom.config.set(`${themeName}.tabCloseButton`, 'Left')
    expect(
      document.documentElement.getAttribute(
        `theme-${themeName}-tab-close-button`
      )
    ).toBe('left')
  })

  it('allows the dock toggle buttons to be hidden via config', () => {
    atom.config.set(`${themeName}.hideDockButtons`, true)
    expect(
      document.documentElement.getAttribute(`theme-${themeName}-dock-buttons`)
    ).toBe('hidden')
  })

  it('allows the tree-view headers to be sticky via config', () => {
    atom.config.set(`${themeName}.stickyHeaders`, true)
    expect(
      document.documentElement.getAttribute(`theme-${themeName}-sticky-headers`)
    ).toBe('sticky')
  })

  it('allows the tree-view headers to not be sticky via config', () => {
    atom.config.set(`${themeName}.stickyHeaders`, false)
    expect(
      document.documentElement.getAttribute(`theme-${themeName}-sticky-headers`)
    ).toBe(null)
  })
})