const modulo = require('../../src/deps/math/modulo')

const eq = (x, y, msg) => expect(x).toEqual(y)

describe('modulo', function() {
  it('divides the first param by the second and returns the remainder', function() {
    eq(modulo(100, 2), 0)
    eq(modulo(100, 3), 1)
    eq(modulo(100, 17), 15)
  })

  it('is curried', function() {
    var hundredMod = modulo(100)
    eq(typeof hundredMod, 'function')
    eq(hundredMod(2), 0)
    eq(hundredMod(3), 1)
    eq(hundredMod(17), 15)
  })

  it('behaves right curried when passed `__` for its first argument', function() {
    var isOdd = modulo('_', 2)
    eq(typeof isOdd, 'function')
    eq(isOdd(3), 1)
    eq(isOdd(198), 0)
  })

  it('preserves javascript-style modulo evaluation for negative numbers', function() {
    eq(modulo(-5, 4), -1)
  })
})