@electric-sql/d2mini/tests/operators/debug.test.ts

D2Mini is a minimal implementation of Differential Dataflow for performing in-memory incremental view maintenance.

import { describe, test, expect, vi } from 'vitest'
import { D2 } from '../../src/d2.js'
import { MultiSet } from '../../src/multiset.js'
import { debug } from '../../src/operators/index.js'

describe('Operators', () => {
  describe('Debug operation', () => {
    test('basic debug operation', () => {
      const graph = new D2()
      const input = graph.newInput<number>()
      const consoleSpy = vi.spyOn(console, 'log')

      input.pipe(debug('test'))

      graph.finalize()

      input.sendData(
        new MultiSet([
          [1, 1],
          [2, 1],
          [3, 1],
        ]),
      )

      graph.run()

      expect(consoleSpy).toHaveBeenCalledWith(
        'debug test data: MultiSet([[1,1],[2,1],[3,1]])',
      )
    })

    test('debug with indentation', () => {
      const graph = new D2()
      const input = graph.newInput<number>()
      const consoleSpy = vi.spyOn(console, 'log')

      input.pipe(debug('test', true))

      graph.finalize()

      input.sendData(
        new MultiSet([
          [1, 1],
          [2, 1],
          [3, 1],
        ]),
      )

      graph.run()

      expect(consoleSpy).toHaveBeenCalledWith(
        'debug test data: MultiSet([\n  [\n    1,\n    1\n  ],\n  [\n    2,\n    1\n  ],\n  [\n    3,\n    1\n  ]\n])',
      )
    })

    test('debug with negative multiplicities', () => {
      const graph = new D2()
      const input = graph.newInput<number>()
      const consoleSpy = vi.spyOn(console, 'log')

      input.pipe(debug('test'))

      graph.finalize()

      input.sendData(
        new MultiSet([
          [1, -1],
          [2, -2],
          [3, 1],
        ]),
      )

      graph.run()

      expect(consoleSpy).toHaveBeenCalledWith(
        'debug test data: MultiSet([[1,-1],[2,-2],[3,1]])',
      )
    })
  })
})