import assert from 'assert';
import lodashStable from 'lodash';
import { set, falsey, stubFalse, args, slice, symbol, weakSet, realm } from './utils.js';
import isSet from '../isSet.js';

describe('isSet', function() {
  it('should return `true` for sets', function() {
    if (Set) {
      assert.strictEqual(isSet(set), true);
    }
  });

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

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

    assert.deepStrictEqual(actual, expected);

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

  it('should work for objects with a non-function `constructor` (test in IE 11)', function() {
    var values = [false, true],
        expected = lodashStable.map(values, stubFalse);

    var actual = lodashStable.map(values, function(value) {
      return isSet({ 'constructor': value });
    });

    assert.deepStrictEqual(actual, expected);
  });

  it('should work with weak sets from another realm', function() {
    if (realm.set) {
      assert.strictEqual(isSet(realm.set), true);
    }
  });
});