getStagedFiles.spec.js

import path from 'path'

import normalize from 'normalize-path'

import { getStagedFiles } from '../lib/getStagedFiles'
import { execGit } from '../lib/execGit'

jest.mock('../lib/execGit')

// Windows filepaths
const normalizePath = (input) => normalize(path.resolve('/', input))

describe('getStagedFiles', () => {
  afterEach(() => {
    jest.clearAllMocks()
  })

  it('should return array of file names', async () => {
    execGit.mockImplementationOnce(async () => 'foo.js\u0000bar.js\u0000')
    const staged = await getStagedFiles({ cwd: '/' })
    // Windows filepaths
    expect(staged).toEqual([normalizePath('/foo.js'), normalizePath('/bar.js')])

    expect(execGit).toHaveBeenLastCalledWith(
      ['diff', '--diff-filter=ACMR', '--name-only', '-z', '--staged'],
      { cwd: '/' }
    )
  })

  it('should return empty array when no staged files', async () => {
    execGit.mockImplementationOnce(async () => '')
    const staged = await getStagedFiles()
    expect(staged).toEqual([])
  })

  it('should return null in case of error', async () => {
    execGit.mockImplementationOnce(async () => {
      throw new Error('fatal: not a git repository (or any of the parent directories): .git')
    })
    const staged = await getStagedFiles({})
    expect(staged).toEqual(null)
  })

  it('should support overriding diff trees with ...', async () => {
    execGit.mockImplementationOnce(async () => 'foo.js\u0000bar.js\u0000')
    const staged = await getStagedFiles({ cwd: '/', diff: 'master...my-branch' })
    // Windows filepaths
    expect(staged).toEqual([normalizePath('/foo.js'), normalizePath('/bar.js')])

    expect(execGit).toHaveBeenLastCalledWith(
      ['diff', '--diff-filter=ACMR', '--name-only', '-z', 'master...my-branch'],
      { cwd: '/' }
    )
  })

  it('should support overriding diff trees with multiple args', async () => {
    execGit.mockImplementationOnce(async () => 'foo.js\u0000bar.js\u0000')
    const staged = await getStagedFiles({ cwd: '/', diff: 'master my-branch' })
    // Windows filepaths
    expect(staged).toEqual([normalizePath('/foo.js'), normalizePath('/bar.js')])

    expect(execGit).toHaveBeenLastCalledWith(
      ['diff', '--diff-filter=ACMR', '--name-only', '-z', 'master', 'my-branch'],
      { cwd: '/' }
    )
  })
})