private void CheckInvalidTryParse(string input)
{
StringWithQualityHeaderValue result = null;
Assert.False(StringWithQualityHeaderValue.TryParse(input, out result));
Assert.Null(result);
}
private void CheckValidTryParse(string input, StringWithQualityHeaderValue expectedResult)
{
StringWithQualityHeaderValue result = null;
Assert.True(StringWithQualityHeaderValue.TryParse(input, out result));
Assert.Equal(expectedResult, result);
}