// @flow
/* eslint-env mocha */

import assert from 'power-assert'
import subMinutes from '.'

describe('subMinutes', function() {
  it('subtracts the given number of minutes', function() {
    const result = subMinutes(new Date(2014, 6 /* Jul */, 10, 12, 0), 30)
    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 11, 30))
  })

  it('accepts a timestamp', function() {
    const result = subMinutes(
      new Date(2014, 6 /* Jul */, 10, 12, 0).getTime(),
      20
    )
    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 11, 40))
  })

  it('converts a fractional number to an integer', function() {
    const result = subMinutes(new Date(2014, 6 /* Jul */, 10, 12, 0), 30.4)
    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 11, 30))
  })

  it('implicitly converts number arguments', function() {
    // $ExpectedMistake
    const result = subMinutes(new Date(2014, 6 /* Jul */, 10, 12, 0), '30')
    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 11, 30))
  })

  it('does not mutate the original date', function() {
    const date = new Date(2014, 6 /* Jul */, 10, 12, 0)
    subMinutes(date, 25)
    assert.deepEqual(date, new Date(2014, 6 /* Jul */, 10, 12, 0))
  })

  it('returns `Invalid Date` if the given date is invalid', function() {
    const result = subMinutes(new Date(NaN), 30)
    // @ts-expect-error
    assert(result instanceof Date && isNaN(result))
  })

  it('returns `Invalid Date` if the given amount is NaN', function() {
    const result = subMinutes(new Date(2014, 6 /* Jul */, 10, 12, 0), NaN)
    // @ts-expect-error
    assert(result instanceof Date && isNaN(result))
  })

  it('throws TypeError exception if passed less than 2 arguments', function() {
    assert.throws(subMinutes.bind(null), TypeError)
    assert.throws(subMinutes.bind(null, 1), TypeError)
  })
})