"use strict";

const nthArg = require("../../src/deps/fp/nthArg");

const eq = (x, y, msg) => expect(x).toEqual(y);

describe('nthArg', function () {
  it.skip('returns a function which returns its nth argument', function () {
    eq(nthArg(0)('foo', 'bar'), 'foo');
    eq(nthArg(1)('foo', 'bar'), 'bar');
  });
  it.skip('accepts negative offsets', function () {
    eq(nthArg(-1)('foo', 'bar'), 'bar');
    eq(nthArg(-2)('foo', 'bar'), 'foo');
    eq(nthArg(-3)('foo', 'bar'), undefined);
  });
  it('returns a function with length n + 1 when n >= 0', function () {
    eq(nthArg(0).length, 1);
    eq(nthArg(1).length, 2);
    eq(nthArg(2).length, 3);
    eq(nthArg(3).length, 4);
  });
  it('returns a function with length 1 when n < 0', function () {
    eq(nthArg(-1).length, 1);
    eq(nthArg(-2).length, 1);
    eq(nthArg(-3).length, 1);
  });
  it('returns a curried function', function () {
    eq(nthArg(1)('foo', 'bar'), nthArg(1)('foo')('bar'));
    eq(nthArg(2)('foo', 'bar', 'baz'), nthArg(2)('foo')('bar')('baz'));
  });
});