'use strict';

const assert = require('assert');

const validation = require('../lib/Validation');

const Validation = validation.Validation;

describe('Validation', function () {
  describe('isValidUTF8', function () {
    it('should return true for a valid utf8 string', function () {
      const validBuffer = Buffer.from(
        'Lorem ipsum dolor sit amet, consectetur adipiscing elit. ' +
        'Quisque gravida mattis rhoncus. Donec iaculis, metus ' +
        'quis varius accumsan, erat mauris condimentum diam, et ' +
        'egestas erat enim ut ligula. Praesent sollicitudin tellus ' +
        'eget dolor euismod euismod. Nullam ac augue nec neque ' +
        'varius luctus. Curabitur elit mi, consequat ultricies ' +
        'adipiscing mollis, scelerisque in erat. Phasellus facilisis ' +
        ' fermentum ullamcorper. Nulla et sem eu arcu pharetra ' +
        'pellentesque. Praesent consectetur tempor justo, vel ' +
        'iaculis dui ullamcorper sit amet. Integer tristique viverra ' +
        'ullamcorper. Vivamus laoreet, nulla eget suscipit eleifend, ' +
        'lacus lectus feugiat libero, non fermentum erat nisi at ' +
        'risus. Lorem ipsum dolor sit amet, consectetur adipiscing ' +
        'elit. Ut pulvinar dignissim tellus, eu dignissim lorem ' +
        'vulputate quis. Morbi ut pulvinar augue.'
      );

      assert.ok(Validation.isValidUTF8(validBuffer));
    });

    it('should return false for an erroneous string', function () {
      const invalidBuffer = Buffer.from([
        0xce, 0xba, 0xe1, 0xbd, 0xb9, 0xcf, 0x83,
        0xce, 0xbc, 0xce, 0xb5, 0xed, 0xa0, 0x80,
        0x65, 0x64, 0x69, 0x74, 0x65, 0x64
      ]);

      assert.ok(!Validation.isValidUTF8(invalidBuffer));
    });

    it('should return true for valid cases from the autobahn test suite', function () {
      assert.ok(Validation.isValidUTF8(Buffer.from([0xf0, 0x90, 0x80, 0x80])));
      assert.ok(Validation.isValidUTF8(Buffer.from('\xf0\x90\x80\x80')));
    });

    it('should return false for erroneous autobahn strings', function () {
      assert.ok(!Validation.isValidUTF8(Buffer.from([0xce, 0xba, 0xe1, 0xbd])));
    });
  });
});