All

var mrBurns = new Person { Name = "Mr.Burns", Salary = 3000000 };
var kentBrockman = new Person { Name = "Homer", Salary = 3000000 };
var homer = new Person { Name = "Homer", Salary = 30000 };
var millionaires = new List<Person> { mrBurns, kentBrockman, homer };
millionaires.ShouldAllBe(m => m.Salary > 1000000);

‚Äčsnippet source | anchor

Exception

millionaires
should satisfy the condition
(m.Salary > 1000000)
but
[Homer]
do not