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PropertyChangedAssertionsRaised_PropertyChangedT Method (SmartAssertPlaceHolder, T, String)

Creates an Assertion that ensure an object property/indexer changed to a different value in the Act part of your test.

Namespace:  SmartTests.Assertions
Assembly:  SmartTests (in SmartTests.dll) Version: 1.9.0
public static Assertion Raised_PropertyChanged<T>(
	this SmartAssertPlaceHolder this,
	T instance,
	params string[] propertyNames
where T : INotifyPropertyChanged


Type: SmartTestsSmartAssertPlaceHolder
The dummy place holder for all Smart Assertions.
Type: T
The instance for which the property/indexer should change.
Type: SystemString
The names of the property/indexer that should change.

Type Parameters

The type of the property/indexer that should change.

Return Value

Type: Assertion
The newly created Assertion.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type SmartAssertPlaceHolder. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
ArgumentNullException If instance or propertyNames are null.

If the INotifyPropertyChanged event is not raised.

If PropertyName is not in propertyNames in the event.
This Assertion ensures that:
  1. Before the Act -

    Nothing special.

  2. During the Act -

    Ensures the PropertyChanged event is raised.

    The PropertyName is one of propertyNames; otherwise a SmartTestException is thrown.

    Note that you have to repeat names if the event is raised multiple times for the same property.

  3. After the Act -

    If the event is not raised, a SmartTestException is thrown.

In this example, the Smart Assertion verifies that the PropertyChanged event is raised twice, once for MyProperty and once for OtherProperty, in any order.
public void MyMethodTest()
    var mc = new MyClass();
    RunTest( ValidValue.IsValid,
             () => mc.MyMethod(),
             SmartAssert.Raised_PropertyChanged( mc, nameof(MyClass.MyProperty), nameof(MyClass.OtherProperty) ) );
See Also