private void Arrange()
        {
            _context = new Mock <IApplicationContext>();
            _context.Setup(ctx => ctx.StreamerPlatforms).Returns(new[]
            {
                new StreamerPlatform {
                    Id = Guid.NewGuid(), Name = "platform", Url = "UrlAlreadyExists"
                }
            }.AsQueryable());

            _subject = new IsPlatformRegisteredHandler(_context.Object);
        }
        private void Arrange()
        {
            _context = new Mock <IApplicationContext>();

            _subject = new IsPlatformRegisteredHandler(_context.Object);
        }