DefaultConstraint

DefaultConstraint tests that the actual value is the default value for the type.

It is implemented equal to the C# keyword default.

Constructor

DefaultConstraint()

Syntax

Is.Default
Has.Length.Default
Has.Count.Default
Is.Not.Default

All resolvable properties of Has can be used with the Default property. Default can be used with the Not operator. Default can be used with the combinatorial operators.

Examples of use

[Test]
public void DefaultConstraintExample()
{
    string defaultLength = string.Empty;
    var nonDefaultLength = "1";
    var defaultList = new List<int>(); 
    var nonDefaultList = new List<int> {1};
    var defaultDate = default(DateTime);
    var nonDefaultDate = DateTime.Now;

    using (Assert.EnterMultipleScope())
    {
        Assert.That(defaultLength.Length, Is.Zero);
        Assert.That(defaultLength.Length, Is.Default);
        Assert.That(defaultLength, Has.Length.Default);
        Assert.That(defaultLength, Has.Property("Length").Default);
        Assert.That(defaultList, Has.Count.Default);
        Assert.That(defaultDate, Is.Default);

        Assert.That(nonDefaultLength.Length, Is.Not.Zero);
        Assert.That(nonDefaultLength.Length, Is.Not.Default);
        Assert.That(nonDefaultLength, Has.Length.Not.Default);
        Assert.That(nonDefaultLength, Has.Property("Length").Not.Default);
        Assert.That(nonDefaultList, Has.Count.Not.Default);
        Assert.That(nonDefaultDate, Is.Not.Default);
    }
}

Version

From version 4.0.0