PropertyExists Constraint

PropertyExistsConstraint tests for the existence of a named property on an object.

Usage

Has.Property(string propertyName)

Examples

[Test]
public void PropertyExistsConstraint_Examples()
{
    // Check that property exists
    Assert.That("Hello", Has.Property("Length"));
    Assert.That(new List<int>(), Has.Property("Count"));

    // Negative test
    Assert.That("Hello", Has.No.Property("NonExistent"));

    // Check that multiple properties exist
    var person = new Person { Name = "Alice", Age = 30 };
    Assert.That(person, Has.Property("Name").And.Property("Age"));
}

Notes

  1. When no constraint is chained after Has.Property(), it creates a PropertyExistsConstraint.
  2. When a constraint follows (e.g., .EqualTo(5)), it becomes a PropertyConstraint.
  3. The property must be public and readable.

See Also