localstorage-memory/tests/test.localstorage-memory.js

localStorage-compatible API, but only stored in memory

/* global beforeEach, describe, it */
const expect = require('expect.js')

const localStorageMemory = require('../lib/localstorage-memory')

describe('localStorageMemory()', function () {
  beforeEach(function () {
    localStorageMemory.clear()
  })
  describe('localStorageMemory.getItem("foo")', function () {
    describe('"foo" has been set before', function () {
      beforeEach(function () {
        localStorageMemory.setItem('foo', 'bar')
      })

      it('returns true', function () {
        expect(localStorageMemory.getItem('foo')).to.be('bar')
      })
    })
    describe('foo has not been set before', function () {
      it('returns null', function () {
        expect(localStorageMemory.getItem('foo')).to.be(null)
      })
    })
    describe('foo can take empty string value', function () {
      it('returns empty string, not a null or undefined', function () {
        localStorageMemory.setItem('foo', '')
        expect(localStorageMemory.getItem('foo')).to.be('')
      })
    })
  })
  describe('localStorageMemory.setItem(123, 456)', function () {
    it('stores key & value as string', function () {
      localStorageMemory.setItem(123, null)
      expect(localStorageMemory.getItem('123')).to.be('null')
    })
  })
  describe('localStorageMemory.removeItem(123)', function () {
    it('removes item "123"', function () {
      localStorageMemory.setItem('123', 'foo')
      localStorageMemory.removeItem(123)
      expect(localStorageMemory.getItem(123)).to.be(null)
    })
  })
  describe('localStorageMemory.key(0)', function () {
    describe('"foo" has been set before as only item', function () {
      beforeEach(function () {
        localStorageMemory.setItem('foo', 'bar')
      })

      it('returns foo', function () {
        expect(localStorageMemory.key(0)).to.be('foo')
      })
    })
    describe('no item has been set', function () {
      it('returns null', function () {
        expect(localStorageMemory.key(0)).to.be(null)
      })
    })
  })
  describe('localStorageMemory.clear()', function () {
    it('removes all items', function () {
      localStorageMemory.setItem('123', 'foo')
      localStorageMemory.setItem(456, 'bar')
      localStorageMemory.clear()
      expect(localStorageMemory.length).to.be(0)
      expect(localStorageMemory.getItem(123)).to.be(null)
      expect(localStorageMemory.getItem(456)).to.be(null)
    })
  })
  describe('localStorageMemory.length', function () {
    it('duplicate puts don\'t increase length', function () {
      localStorageMemory.setItem('123', 'foo')
      localStorageMemory.setItem('123', 'foo')
      expect(localStorageMemory.length).to.be(1)
    })
    it('remove non-existent item doesn\'t decrease length', function () {
      localStorageMemory.setItem('123', 'foo')
      localStorageMemory.removeItem('abc')
      expect(localStorageMemory.length).to.be(1)
    })
  })
})