private void CheckInvalidTryParse(string?input)
 {
     Assert.False(ContentDispositionHeaderValue.TryParse(input, out var result), input);
     Assert.Null(result);
 }
 private void CheckValidTryParse(string?input, ContentDispositionHeaderValue expectedResult)
 {
     Assert.True(ContentDispositionHeaderValue.TryParse(input, out var result), input);
     Assert.Equal(expectedResult, result);
 }