import assert from 'assert';
import lodashStable from 'lodash';
import mapKeys from '../mapKeys.js';

describe('mapKeys', function() {
  var array = [1, 2],
      object = { 'a': 1, 'b': 2 };

  it('should map keys in `object` to a new object', function() {
    var actual = mapKeys(object, String);
    assert.deepStrictEqual(actual, { '1': 1, '2': 2 });
  });

  it('should treat arrays like objects', function() {
    var actual = mapKeys(array, String);
    assert.deepStrictEqual(actual, { '1': 1, '2': 2 });
  });

  it('should work with `_.property` shorthands', function() {
    var actual = mapKeys({ 'a': { 'b': 'c' } }, 'b');
    assert.deepStrictEqual(actual, { 'c': { 'b': 'c' } });
  });

  it('should use `_.identity` when `iteratee` is nullish', function() {
    var object = { 'a': 1, 'b': 2 },
        values = [, null, undefined],
        expected = lodashStable.map(values, lodashStable.constant({ '1': 1, '2': 2 }));

    var actual = lodashStable.map(values, function(value, index) {
      return index ? mapKeys(object, value) : mapKeys(object);
    });

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