import * as B from "."
import { bus } from "./bus"
import { tap, toProperty } from "./index"
import { expectPropertyEvents, series } from "./test-utils"
import { nop } from "./util"

const times2 = (x: number) => x * 2
const toString = (x: number) => "" + x

describe("Property.tap", () => {
  describe("Doesn't affect values", () => {
    expectPropertyEvents(() => {
      const x = series(1, [2]).pipe(toProperty(1), tap(toString))
      return x
    }, [1, 2])
  })
  it("Calls given function for values", () => {
    const numbers: number[] = []
    function store(n: number) {
      numbers.push(n)
    }
    const b = bus<number>()
    const tapped = b.pipe(tap(store))
    tapped.forEach(nop)
    b.push(1)
    b.push(2)
    expect(numbers).toEqual([1, 2])
  })
})