## Property Constraints (NUnit 2.4.2)

Property constraints are used to test for the existence of a named property and optionally to test its value. It may also be used as a prefix for other constraints to be applied to the property.

### PropertyExistsConstraint

#### Action

Tests for the existence of a named property on an object.

#### Constructor

    PropertyExistsConstraint(string name)

#### Syntax

    Has.Property( string )

#### Examples of Use

    Assert.That( someObject, Has.Property( "Version" ) );

### PropertyConstraint

#### Action

Tests for the existence of a named property on an object and causes subsequent allows tests to be made on the property value.

#### Constructor

    PropertyConstraint(string name)

#### Syntax

    Has.Property(string)...

#### Examples of Use

    Assert.That(someObject, Has.Property("Version").EqualTo("2.0"));
    Assert.That(collection, Has.Property("Count").GreaterThan(10));

### Special Properties

Certain common properties are known to NUnit and may be tested using the following syntax...

    Has.Length...
    Has.Count...
    Has.Message...
    Has.InnerException...