public void Password_checker_should_check_first_rules()
{
var input1 = new PasswordChecker("1-3 a: abcde");
var output1 = input1.isPasswordValidFirstRuleSet();
Assert.True(output1);
var input2 = new PasswordChecker("1-3 b: cdefg");
var output2 = input2.isPasswordValidFirstRuleSet();
Assert.False(output2);
var input3 = new PasswordChecker("2-9 c: ccccccccc");
var output3 = input3.isPasswordValidFirstRuleSet();
Assert.True(output3);
}