import assert from 'assert';
import lodashStable from 'lodash';
import { slice } from './utils.js';
import unary from '../unary.js';

describe('unary', function() {
  function fn() {
    return slice.call(arguments);
  }

  it('should cap the number of arguments provided to `func`', function() {
    var actual = lodashStable.map(['6', '8', '10'], unary(parseInt));
    assert.deepStrictEqual(actual, [6, 8, 10]);
  });

  it('should not force a minimum argument count', function() {
    var capped = unary(fn);
    assert.deepStrictEqual(capped(), []);
  });

  it('should use `this` binding of function', function() {
    var capped = unary(function(a, b) { return this; }),
        object = { 'capped': capped };

    assert.strictEqual(object.capped(), object);
  });
});