akkoma-fe/test/unit/specs/services/chat_service/chat_service.spec.js

import chatService from '../../../../../src/services/chat_service/chat_service.js'

const message1 = {
  id: '9wLkdcmQXD21Oy8lEX',
  idempotency_key: '1',
  created_at: (new Date('2020-06-22T18:45:53.000Z'))
}

const message2 = {
  id: '9wLkdp6ihaOVdNj8Wu',
  idempotency_key: '2',
  account_id: '9vmRb29zLQReckr5ay',
  created_at: (new Date('2020-06-22T18:45:56.000Z'))
}

const message3 = {
  id: '9wLke9zL4Dy4OZR2RM',
  idempotency_key: '3',
  account_id: '9vmRb29zLQReckr5ay',
  created_at: (new Date('2020-07-22T18:45:59.000Z'))
}

describe('chatService', () => {
  describe('.add', () => {
    it("Doesn't add duplicates", () => {
      const chat = chatService.empty()
      chatService.add(chat, { messages: [ message1 ] })
      chatService.add(chat, { messages: [ message1 ] })
      expect(chat.messages.length).to.eql(1)

      chatService.add(chat, { messages: [ message2 ] })
      expect(chat.messages.length).to.eql(2)
    })

    it('Updates minId and lastMessage and newMessageCount', () => {
      const chat = chatService.empty()

      chatService.add(chat, { messages: [ message1 ] })
      expect(chat.maxId).to.eql(message1.id)
      expect(chat.minId).to.eql(message1.id)
      expect(chat.newMessageCount).to.eql(1)

      chatService.add(chat, { messages: [ message2 ] })
      expect(chat.maxId).to.eql(message2.id)
      expect(chat.minId).to.eql(message1.id)
      expect(chat.newMessageCount).to.eql(2)

      chatService.resetNewMessageCount(chat)
      expect(chat.newMessageCount).to.eql(0)
      expect(chat.lastSeenMessageId).to.eql(message2.id)

      // Add message with higher id
      chatService.add(chat, { messages: [ message3 ] })
      expect(chat.newMessageCount).to.eql(1)
    })
  })

  describe('.delete', () => {
    it('Updates minId and lastMessage', () => {
      const chat = chatService.empty()

      chatService.add(chat, { messages: [ message1 ] })
      chatService.add(chat, { messages: [ message2 ] })
      chatService.add(chat, { messages: [ message3 ] })

      expect(chat.maxId).to.eql(message3.id)
      expect(chat.minId).to.eql(message1.id)

      chatService.deleteMessage(chat, message3.id)
      expect(chat.maxId).to.eql(message2.id)
      expect(chat.minId).to.eql(message1.id)

      chatService.deleteMessage(chat, message1.id)
      expect(chat.maxId).to.eql(message2.id)
      expect(chat.minId).to.eql(message2.id)
    })
  })

  describe('.getView', () => {
    it('Inserts date separators', () => {
      const chat = chatService.empty()

      chatService.add(chat, { messages: [ message1 ] })
      chatService.add(chat, { messages: [ message2 ] })
      chatService.add(chat, { messages: [ message3 ] })

      const view = chatService.getView(chat)
      expect(view.map(i => i.type)).to.eql(['date', 'message', 'message', 'date', 'message'])
    })
  })

  describe('.cullOlderMessages', () => {
    it('keeps 50 newest messages and idIndex matches', () => {
      const chat = chatService.empty()

      for (let i = 100; i > 0; i--) {
        // Use decimal values with toFixed to hack together constant length predictable strings
        chatService.add(chat, { messages: [{ ...message1, id: 'a' + (i / 1000).toFixed(3), idempotency_key: i }] })
      }
      chatService.cullOlderMessages(chat)
      expect(chat.messages.length).to.eql(50)
      expect(chat.messages[0].id).to.eql('a0.051')
      expect(chat.minId).to.eql('a0.051')
      expect(chat.messages[49].id).to.eql('a0.100')
      expect(Object.keys(chat.idIndex).length).to.eql(50)
    })
  })
})