/* eslint-env mocha */

import assert from 'assert'
import previousMonday from '.'

describe('previousMonday', () => {
  it('returns the previous Monday given various dates after the same', () => {
    assert.deepStrictEqual(
      previousMonday(new Date(2021, 5 /* Jun */, 5)),
      new Date(2021, 4 /* May */, 31)
    )

    assert.deepStrictEqual(
      previousMonday(new Date(2021, 5 /* Jun */, 6)),
      new Date(2021, 4 /* May */, 31)
    )

    assert.deepStrictEqual(
      previousMonday(new Date(2021, 5 /* Jun */, 7)),
      new Date(2021, 4 /* May */, 31)
    )

    assert.deepStrictEqual(
      previousMonday(new Date(2021, 5 /* Jun */, 14)),
      new Date(2021, 5 /* Jun */, 7)
    )

    assert.deepStrictEqual(
      previousMonday(new Date(2021, 5 /* Jun */, 15)),
      new Date(2021, 5 /* Jun */, 14)
    )

    assert.deepStrictEqual(
      previousMonday(new Date(2021, 5 /* Jun */, 16)),
      new Date(2021, 5 /* Jun */, 14)
    )
  })

  it('returns `Invalid Date` if the given date is invalid', () => {
    assert(previousMonday(new Date(NaN)) instanceof Date)
  })
})