import arraysEQ from './arraysEQ'

describe("arraysEQ", function() {
  it("should require lengths to be equal", function() {
    expect(arraysEQ([1], [1])).toBe(true)
    expect(arraysEQ([], [1])).toBe(false)
  })
  it("should require elements to be equal", function() {
    expect(arraysEQ([1], [1])).toBe(true)
    expect(arraysEQ([1], ['1'])).toBe(false)
  })
  //
  // Combinations of [], null, and undefined.
  // There will be 9 = 3 x 3 of them.
  //
  // 1
  it("(undefined, undefined) => true", function() {
    expect(arraysEQ(void 0, void 0)).toBe(true)
    expect(arraysEQ(void 0, void 0)).toBe(void 0 === void 0)
  })
  // 2
  it("(undefined, []) => false", function() {
    expect(arraysEQ(void 0, [])).toBe(false)
    expect(arraysEQ(void 0, [])).toBe(void 0 === [])
  })
  // 3
  it("([], undefined) => false", function() {
    expect(arraysEQ([], void 0)).toBe(false)
    expect(arraysEQ([], void 0)).toBe([] === void 0)
  })
  // 4
  it("([], []) => true", function() {
    expect(arraysEQ([], [])).toBe(true)
  })
  // 5
  it("(null, null) => true", function() {
    expect(arraysEQ(null, null)).toBe(true)
    expect(arraysEQ(null, null)).toBe(null === null)
  })
  // 6
  it("(null, []) => false", function() {
    expect(arraysEQ(null, [])).toBe(false)
    expect(arraysEQ(null, [])).toBe(null === [])
  })
  // 7
  it("([], null) => false", function() {
    expect(arraysEQ([], null)).toBe(false)
    expect(arraysEQ([], null)).toBe([] === null)
  })
  // 8
  it("(null, undefined) => false", function() {
    expect(arraysEQ(null, void 0)).toBe(false)
    expect(arraysEQ(null, void 0)).toBe(null === void 0)
  })
  // 9
  it("(undefined, null) => false", function() {
    expect(arraysEQ(void 0, null)).toBe(false)
    expect(arraysEQ(void 0, null)).toBe(void 0 === null)
  })
})