Not Constraint

NotConstraint reverses the effect of another constraint. If the base constraint fails, NotConstraint succeeds. If the base constraint succeeds, NotConstraint fails.

Constructor

NotConstraint()

Syntax

Is.Not...

Examples of Use

public class Person
{
    public string Name { get; set; } = "";
    public int Age { get; set; }
    public string Email { get; set; } = "";
}

[Test]
public void PropertyConstraint_Examples()
{
    var person = new Person { Name = "John", Age = 25, Email = "john@example.com" };
    
    Assert.That(person, Has.Property("Name").EqualTo("John"));
    Assert.That(person, Has.Property("Age").GreaterThan(18));
    Assert.That(person, Has.Property("Email").Contains("@"));
}