public void Copy_NameAndValue_SuccessfullyCopied()
{
var pair0 = new NameValueHeaderValue("name", "value");
var pair1 = pair0.Copy();
Assert.NotSame(pair0, pair1);
Assert.Same(pair0.Name.Value, pair1.Name.Value);
Assert.Same(pair0.Value.Value, pair1.Value.Value);
// Change one value and verify the other is unchanged.
pair0.Value = "othervalue";
Assert.Equal("othervalue", pair0.Value);
Assert.Equal("value", pair1.Value);
}