Attribute Constraint

AttributeConstraint tests for the existence of an attribute on a type and then applies a further constraint to that attribute's properties.

Usage

Has.Attribute(Type attributeType).<constraint>
Has.Attribute<TAttribute>().<constraint>

Examples

[TestFixture(Description = "Integration tests")]
[Category("Database")]
public class AttributeConstraintExamplesFixture
{
    [Test]
    public void AttributeConstraint_Examples()
    {
        // Test that a type has an attribute with specific properties
        Assert.That(typeof(AttributeConstraintExamplesFixture), Has.Attribute<TestFixtureAttribute>()
            .Property("Description").EqualTo("Integration tests"));

        Assert.That(typeof(AttributeConstraintExamplesFixture), Has.Attribute(typeof(CategoryAttribute))
            .Property("Name").EqualTo("Database"));
    }
}

Notes

  1. The constraint first checks that the attribute exists, then applies the chained constraint to the attribute instance.
  2. To only check for attribute existence without testing its properties, use AttributeExistsConstraint.
  3. The constraint works on both Type objects and instances (testing the instance's type).

See Also