const expect = require("expect");
const dig = require("./dig.js");

const data = {
  level1: {
    level2: {
      level3: "some data",
      level3f: false,
      level3a: [1, 2, 3, 4]
    }
  }
};

test("dig is a Function", () => {
  expect(dig).toBeInstanceOf(Function);
});

test("Dig target success", () => {
  expect(dig(data, "level3")).toEqual("some data");
});

test("Dig target with falsey value", () => {
  expect(dig(data, "level3f")).toEqual(false);
});

test("Dig target with array", () => {
  expect(dig(data, "level3a")).toEqual([1,2,3,4]);
});

test("Unknown target return undefined", () => {
  expect(dig(data, "level4")).toEqual(undefined);
});