fission-suite/webnative

import expect from "expect"
import * as util from "./util.js"


describe("removes a key from an object", () => {
  it("removes a key from an object", () => {
    const obj = { a: 1, b: 2 }
    expect(util.removeKeyFromObj(obj, "b")).toEqual({ a: 1 })
  })

  it("removes the last key and returns an empty object", () => {
    const obj = { a: 1 }
    expect(util.removeKeyFromObj(obj, "a")).toEqual({})
  })

  it("returns the same object when the key is missing", () => {
    const obj = { a: 1 }
    expect(util.removeKeyFromObj(obj, "b")).toEqual({ a: 1 })
  })
})

describe("updates a value or removes a key from an object", () => {
  it("updates an object", () => {
    const obj = { a: 1 }
    expect(util.updateOrRemoveKeyFromObj(obj, "a", 2)).toEqual({ a: 2 })
  })

  it("removes a key from an object", () => {
    const obj = { a: 1, b: 2 }
    expect(util.updateOrRemoveKeyFromObj(obj, "b", null)).toEqual({ a: 1 })
  })

  it("adds a key when missing on an object", () => {
    const obj = { a: 1 }
    expect(util.updateOrRemoveKeyFromObj(obj, "b", 2)).toEqual({ a: 1, b: 2 })
  })

  it("does not add a key when the update value is null", () => {
    const obj = { a: 1 }
    expect(util.updateOrRemoveKeyFromObj(obj, "b", null)).toEqual({ a: 1 })
  })
})

describe("maps over an object", () => {
  it("adds one to each entry in an object", () => {
    const obj = { a: 1, b: 2, c: 3 }
    expect(util.mapObj(obj, ((val, key) => val + 1))).toEqual({ a: 2, b: 3, c: 4 })
  })

  it("nullifies each entry in an object", () => {
    const obj = { a: 1, b: 2, c: 3 }
    expect(util.mapObj(obj, ((val, key) => null))).toEqual({ a: null, b: null, c: null })
  })

  it("has no effect on an empty object", () => {
    const obj = {}
    expect(util.mapObj(obj, ((val, key) => null))).toEqual({})
  })

  it("sets each entries value to its key", () => {
    const obj = { a: 1, b: 2 }
    expect(util.mapObj(obj, ((val, key) => key))).toEqual({ a: "a", b: "b" })
  })
})

describe("async maps over an object", () => {
  it("adds one to each entry in an object", async () => {
    const obj = { a: 1, b: 2, c: 3 }
    async function addOne(val: number, key: string) { return val + 1 }
    expect(await util.mapObjAsync(obj, addOne)).toEqual({ a: 2, b: 3, c: 4 })
  })

  it("nullifies each entry in an object", async () => {
    const obj = { a: 1, b: 2, c: 3 }
    async function nullify(val: number, key: string) { return null }
    expect(await util.mapObjAsync(obj, nullify)).toEqual({ a: null, b: null, c: null })
  })

  it("has no effect on an empty object", async () => {
    const obj = {}
    async function nullify(val: number, key: string) { return null }
    expect(await util.mapObjAsync(obj, nullify)).toEqual({})
  })

  it("sets each entries value to its key", async () => {
    const obj = { a: 1, b: 2 }
    async function setToKey(val: number, key: string) { return key }
    expect(await util.mapObjAsync(obj, setToKey)).toEqual({ a: "a", b: "b" })
  })
})

describe("array contains", () => {
  it("returns true when an array contains an entry", () => {
    const arr = [ 1, 2, 3 ]
    expect(util.arrContains(arr, 2)).toBe(true)
  })

  it("returns false when an array does not contain an entry", () => {
    const arr = [ 1, 2, 3 ]
    expect(util.arrContains(arr, 0)).toBe(false)
  })

  it("returns false when an array is empty", () => {
    const arr: number[] = []
    expect(util.arrContains(arr, 1)).toBe(false)
  })
})

describe("async waterfall", () => {
  it("accumulates values returned from async calls", async () => {
    async function addOne(val: number) { return val + 1 }
    async function addTwo(val: number) { return val + 2 }
    async function addThree(val: number) { return val + 3 }
    expect(await util.asyncWaterfall(0, [ addOne, addTwo, addThree ])).toEqual(6)
  })

  it("concatenates characters returned from async calls", async () => {
    async function concatB(val: string) { return val + "b" }
    async function concatC(val: string) { return val + "c" }
    async function concatD(val: string) { return val + "d" }
    expect(await util.asyncWaterfall("a", [ concatB, concatC, concatD ])).toEqual("abcd")
  })

  it("returns the initial value when no waterfall", async () => {
    expect(await util.asyncWaterfall(0, [])).toEqual(0)
  })
})