public void Changed_shall_be_thrown_on_a_collection_that_is_the_result_of_the_expression()
{
TestObject TestObject = new TestObject();
Func <TestObject, ObservableExpressionFactory.EventSink, ObservableCollection <TestObject> > CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.ObjectCollection);
bool Changed = false;
CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { Changed = true; }));
TestObject.ObjectCollection.Add(new TestObject());
Assert.IsTrue(Changed);
}
public void It_shall_possible_to_use_static_members()
{
//Events on static properties is not supported (INotifyPropertyChanged only)
ObservableExpressionFactory.Compile(() => TestObject.StaticProperty);
}
public void Changed_shall_be_thrown_after_value_was_retrieved_through_expression_on_a_property_change()
{
TestObject TestObject = new TestObject();
TestObject.InnerObject = new TestObject();
TestObject.InnerObject.Property = "Hello, World";
Func <TestObject, ObservableExpressionFactory.EventSink, string> CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.InnerObject.Property);
bool Changed = false;
string Result = CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { Changed = true; }));
Assert.That(Result, Is.EqualTo("Hello, World"));
TestObject.InnerObject.Property = "Hello, new World!";
Assert.IsTrue(Changed);
}
public void Weak_event_binding_shall_allow_expression_to_be_collected()
{
TestObject TestObject = new TestObject();
TestObject InnerTestObject = new TestObject();
TestObject.ObjectCollection.Add(InnerTestObject);
(WeakReference, WeakReference) Create()
{
Func <TestObject, ObservableExpressionFactory.EventSink, string> CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.ObjectCollection[0].Property);
ObservableExpressionFactory.EventSink Callback = new ObservableExpressionFactory.EventSink(delegate { });
CompiledExpression(TestObject, Callback);
return(new WeakReference(CompiledExpression), new WeakReference(Callback));
}
(WeakReference WeakExpression, WeakReference WeakCallback) = Create();
GC.Collect();
// ReSharper restore RedundantAssignment
Assert.IsFalse(WeakExpression.IsAlive);
Assert.IsFalse(WeakCallback.IsAlive);
//throw event to let the weakdelegates remove themselves (for coverage)
InnerTestObject.Property = "Hello, world";
TestObject.ObjectCollection.Clear();
}
public void events_shall_be_deregistered_after_event_was_thrown()
{
TestObject TestObject = new TestObject();
TestObject TestObject2 = new TestObject();
TestObject.ObjectCollection.Add(TestObject2);
TestObject.ObjectCollection[0].OtherProperty = 42;
//evaluate side effects from other tests
Assert.IsFalse(TestObject.IsEventHandlerRegistered());
Assert.IsFalse(TestObject.IsEventHandlerRegistered());
Func <TestObject, ObservableExpressionFactory.EventSink, int> CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.ObjectCollection.Max(o => o.OtherProperty));
CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { }));
Assert.IsTrue(TestObject.IsEventHandlerRegistered());
Assert.IsTrue(TestObject.IsEventHandlerRegistered());
bool Changed = false;
CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { Changed = true; }));
TestObject.ObjectCollection[0].OtherProperty = 42;
Assert.IsFalse(TestObject.IsEventHandlerRegistered());
Assert.IsFalse(TestObject.IsEventHandlerRegistered());
Changed = false;
TestObject.ObjectCollection.Clear();
Assert.IsFalse(Changed);
}
public void Changed_shall_be_thrown_after_value_was_retrieved_through_expression_on_a_collection_modification()
{
TestObject TestObject = new TestObject();
TestObject.ObjectCollection.Add(new TestObject());
TestObject.ObjectCollection[0].OtherProperty = 42;
Func <TestObject, ObservableExpressionFactory.EventSink, int> CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.ObjectCollection.Max(o => o.OtherProperty));
bool Changed = false;
CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { Changed = true; }));
TestObject.ObjectCollection.Add(new TestObject {
OtherProperty = 84
});
Assert.IsTrue(Changed);
}
public void Changed_shall_NOT_be_thrown_after_value_was_retrieved_through_expression_on_a_property_change_which_was_not_in_the_expression()
{
TestObject TestObject = new TestObject();
TestObject.InnerObject = new TestObject();
TestObject.InnerObject.Property = "Hello, World";
Func <TestObject, ObservableExpressionFactory.EventSink, string> CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.InnerObject.Property);
bool Changed = false;
CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { Changed = true; }));
TestObject.InnerObject.OtherProperty = 42;
Assert.IsFalse(Changed);
}
public void Changed_shall_be_thrown_only_once_on_a_property_change()
{
TestObject TestObject = new TestObject();
TestObject.InnerObject = new TestObject();
TestObject.Property = "Hello, World";
Func <TestObject, ObservableExpressionFactory.EventSink, string> CompiledExpression = ObservableExpressionFactory.Compile((TestObject test) => test.Property + test.Property + test.OtherProperty);
int ChangeCount = 0;
CompiledExpression(TestObject, new ObservableExpressionFactory.EventSink(delegate { ChangeCount++; }));
TestObject.Property = "Hello";
Assert.AreEqual(1, ChangeCount);
}
