gistfile1.cs

    public class UnitTests {
        [Fact]
        public void RoundTripUserAgent() {
            var request = new HttpRequestMessage();
            request.Headers.UserAgent.Add(new ProductInfoHeaderValue("foo", "1.2"));

            var userAgent = request.Headers.UserAgent.ToString();

            var strongUserAgent = ProductInfoHeaderValue.Parse(userAgent);
            Assert.Equal("foo", strongUserAgent.Product.Name);
            Assert.Equal("1.2", strongUserAgent.Product.Version);


        }


        [Fact]
        public void RoundTripDateHeader()
        {
            var request = new HttpRequestMessage();
            request.Headers.Date = new DateTimeOffset(DateTime.Today);

            var dateHeader = request.Headers.GetValues("Date").FirstOrDefault();

            var strongDateHeader = DateTimeOffset.Parse(dateHeader);
            Assert.Equal(DateTime.Today, strongDateHeader);


        }

    }