public void TestFirstProblem()
{
var passports = Day4.ParsePassports("Advent_of_Code_2020.Day4.SampleInput.txt")
.ToList();
Assert.Equal("gry", passports.First().Information["ecl"]);
Assert.Equal("183cm", passports.First().Information["hgt"]);
Assert.Equal("#cfa07d", passports.Last().Information["hcl"]);
Assert.Equal("59in", passports.Last().Information["hgt"]);
Assert.Empty(Day4.FindMissingPassportFields(passports.First()));
Assert.Equal(new [] { "hgt" }, Day4.FindMissingPassportFields(passports[1]));
Assert.Equal(2, Day4.FilterPassportsByExpectedFields(passports).Count());
}