import assert from 'assert';
import lodashStable from 'lodash';
import { document, body, falsey, stubFalse, args, slice, symbol, realm } from './utils.js';
import isElement from '../isElement.js';

describe('isElement', function() {
  it('should return `true` for elements', function() {
    if (document) {
      assert.strictEqual(isElement(body), true);
    }
  });

  it('should return `true` for non-plain objects', function() {
    function Foo() {
      this.nodeType = 1;
    }

    assert.strictEqual(isElement(new Foo), true);
  });

  it('should return `false` for non DOM elements', function() {
    var expected = lodashStable.map(falsey, stubFalse);

    var actual = lodashStable.map(falsey, function(value, index) {
      return index ? isElement(value) : isElement();
    });

    assert.deepStrictEqual(actual, expected);

    assert.strictEqual(isElement(args), false);
    assert.strictEqual(isElement([1, 2, 3]), false);
    assert.strictEqual(isElement(true), false);
    assert.strictEqual(isElement(new Date), false);
    assert.strictEqual(isElement(new Error), false);
    assert.strictEqual(isElement(_), false);
    assert.strictEqual(isElement(slice), false);
    assert.strictEqual(isElement({ 'a': 1 }), false);
    assert.strictEqual(isElement(1), false);
    assert.strictEqual(isElement(/x/), false);
    assert.strictEqual(isElement('a'), false);
    assert.strictEqual(isElement(symbol), false);
  });

  it('should return `false` for plain objects', function() {
    assert.strictEqual(isElement({ 'nodeType': 1 }), false);
    assert.strictEqual(isElement({ 'nodeType': Object(1) }), false);
    assert.strictEqual(isElement({ 'nodeType': true }), false);
    assert.strictEqual(isElement({ 'nodeType': [1] }), false);
    assert.strictEqual(isElement({ 'nodeType': '1' }), false);
    assert.strictEqual(isElement({ 'nodeType': '001' }), false);
  });

  it('should work with a DOM element from another realm', function() {
    if (realm.element) {
      assert.strictEqual(isElement(realm.element), true);
    }
  });
});