import { assert } from "chai";
import isPlainObject from "lodash/isPlainObject";

describe("isPlainObject", function () {
  it("should return true for {}", function () {
    assert.equal(isPlainObject({}), true);
  });

  it("should return true for Object.create(null)", function () {
    assert.equal(isPlainObject(Object.create(null)), true);
  });

  it("should return false for class instances", function () {
    class NotPlain {
      test() {}
    }
    assert.equal(isPlainObject(new NotPlain()), false);
  });

  it("should return false for new Date", function () {
    assert.equal(isPlainObject(new Date()), false);
  });

  it("should return false for null", function () {
    assert.equal(isPlainObject(null), false);
  });

  it("should return false for undefined", function () {
    assert.equal(isPlainObject(undefined), false);
  });

  it("should return false for functions", function () {
    assert.equal(
      isPlainObject(() => {}),
      false
    );
  });

  it("should return false for arrays", function () {
    assert.equal(isPlainObject([]), false);
  });
});