bidirectional-map/test.js at main · educastellano/bidirectional-map · GitHub

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const test = require('brittle')
const BiMap = require('.')

function makeOne() {
  return new BiMap({
    john: 'mary',
    bob: 'alice',
    ptolemy: 'cleopatra'
  })
}

test('it should create an empty Map', function (t) {
  const empty = new BiMap()
  t.is(empty instanceof BiMap, true)
  t.is(empty.size, 0)
})

test('it should get the value by key', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.get('bob'), 'alice')
})

test('it should get the key by value', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.getKey('alice'), 'bob')
})

test('it should set change values of same key', function (t) {
  const monogamy = new BiMap()
  monogamy.set('a', 0)
  monogamy.set('a', 1)
  t.is(monogamy.get('a'), 1)
  t.is(monogamy.getKey(1), 'a')
  t.is(monogamy.hasValue(0), false)
  t.is(monogamy.hasValue(1), true)
})

test('it should set change keys of same value', function (t) {
  const monogamy = new BiMap()
  monogamy.set('a', 0)
  monogamy.set('b', 0)
  t.is(monogamy.get('b'), 0)
  t.is(monogamy.getKey(0), 'b')
  t.is(monogamy.has('a'), false)
  t.is(monogamy.has('b'), true)
})

test('it should set the same key-value', function (t) {
  const monogamy = new BiMap()
  monogamy.set('a', 0)
  monogamy.set('a', 0)
  t.is(monogamy.get('a'), 0)
  t.is(monogamy.getKey(0), 'a')
  t.is(monogamy.has('a'), true)
  t.is(monogamy.hasValue(0), true)
})

test('it should chain calls to set', function (t) {
  const monogamy = new BiMap()
  const result = monogamy.set('a', 0).set('b', 1)

  t.is(result, monogamy)
  t.is(monogamy.get('a'), 0)
  t.is(monogamy.get('b'), 1)
})

test('it should get the size', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.size, 3)
})

test('it should clear', function (t) {
  const monogamy = makeOne()
  monogamy.clear()
  t.is(monogamy.size, 0)
})

test('it should delete by key', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.delete('john'), true)
  t.is(monogamy.has('john'), false)
  t.is(monogamy.hasValue('mary'), false)
})

test('it should not delete by a missing key', function (t) {
  const monogamy = new BiMap()
  t.is(monogamy.delete('missing'), false)
})

test('it should delete by value', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.deleteValue('alice'), true)
  t.is(monogamy.has('bob'), false)
  t.is(monogamy.hasValue('alice'), false)
})

test('it should not delete by a missing value', function (t) {
  const monogamy = new BiMap()
  t.is(monogamy.deleteValue('missing'), false)
})

test('it should return the entries', function (t) {
  const monogamy = makeOne()
  const entriesIt = monogamy.entries()
  t.is(entriesIt.next().value[0], 'john')
  t.is(entriesIt.next().value[1], 'alice')
})

test('it should check if it has a key', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.has('bob'), true)
  t.is(monogamy.has('bill'), false)
})

test('it should check if it has a value', function (t) {
  const monogamy = makeOne()
  t.is(monogamy.hasValue('alice'), true)
  t.is(monogamy.hasValue('laura'), false)
})

test('it should return the keys', function (t) {
  const monogamy = makeOne()
  const keysIt = monogamy.keys()
  t.is(keysIt.next().value, 'john')
  t.is(keysIt.next().value, 'bob')
})

test('it should return the values', function (t) {
  const monogamy = makeOne()
  const valuesIt = monogamy.values()
  t.is(valuesIt.next().value, 'mary')
  t.is(valuesIt.next().value, 'alice')
})

test('it should return the plain {}', function (t) {
  const monogamy = makeOne()
  const object = monogamy.getObject()
  t.is(typeof object, 'object')
  t.is(object['john'], 'mary')
  t.is(object['bob'], 'alice')
})

test('it should return the reverse plain {}', function (t) {
  const monogamy = makeOne()
  const object = monogamy.getObjectReverse()
  t.is(typeof object, 'object')
  t.is(object['mary'], 'john')
  t.is(object['alice'], 'bob')
})

test('it should be iterable', function (t) {
  const monogamy = makeOne()
  const entries = []

  for (const [key, value] of monogamy) {
    entries.push([key, value])
  }

  t.alike(entries, [
    ['john', 'mary'],
    ['bob', 'alice'],
    ['ptolemy', 'cleopatra']
  ])
})