mjackson/expect

/*eslint-disable newline-per-chained-call*/
import expect from '../index'

describe('withArgs', () => {
  const fn = (arg1, arg2) => {
    if (arg1 === 'first' && typeof arg2 === 'undefined') {
      throw new Error('first arg found')
    }
    if (arg1 === 'first' && arg2 === 'second') {
      throw new Error('both args found')
    }
  }

  it('invokes actual function with args', () => {
    expect(() => {
      expect(fn).withArgs('first').toThrow(/first arg found/)
    }).toNotThrow()
  })

  it('can be chained', () => {
    expect(() => {
      expect(fn).withArgs('first').withArgs('second').toThrow(/both args found/)
    }).toNotThrow()
  })

  it('throws when actual is not a function', () => {
    expect(() => {
      expect('not a function').withArgs('first')
    }).toThrow(/must be a function/)
  })
})