dotnet/tests/CommunityToolkit.Mvvm.UnitTests/Test_ObservableObjectAttribute.cs at main · CommunityToolkit/dotnet · GitHub

Name: dotnet/tests/CommunityToolkit.Mvvm.UnitTests/Test_ObservableObjectAttribute.cs at main · CommunityToolkit/dotnet · GitHub
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

usingSystem.ComponentModel;
usingCommunityToolkit.Mvvm.ComponentModel;
usingMicrosoft.VisualStudio.TestTools.UnitTesting;

#pragma warning disable MVVMTK0033

namespaceCommunityToolkit.Mvvm.UnitTests;

[TestClass]
publicpartialclassTest_ObservableObjectAttribute
{
[TestMethod]
publicvoidTest_ObservableObjectAttribute_Events()
{
Assert.IsTrue(typeof(INotifyPropertyChanged).IsAssignableFrom(typeof(SampleModel)));
Assert.IsTrue(typeof(INotifyPropertyChanging).IsAssignableFrom(typeof(SampleModel)));

SampleModel?model=new();

(PropertyChangingEventArgs,int)changing=default;
(PropertyChangedEventArgs,int)changed=default;

model.PropertyChanging+=(s,e)=>
{
Assert.IsNull(changing.Item1);
Assert.IsNull(changed.Item1);
Assert.AreSame(model,s);
Assert.IsNotNull(s);
Assert.IsNotNull(e);

changing=(e,model.Data);
};

model.PropertyChanged+=(s,e)=>
{
Assert.IsNotNull(changing.Item1);
Assert.IsNull(changed.Item1);
Assert.AreSame(model,s);
Assert.IsNotNull(s);
Assert.IsNotNull(e);

changed=(e,model.Data);
};

model.Data=42;

Assert.AreEqual(changing.Item1?.PropertyName,nameof(SampleModel.Data));
Assert.AreEqual(changing.Item2,0);
Assert.AreEqual(changed.Item1?.PropertyName,nameof(SampleModel.Data));
Assert.AreEqual(changed.Item2,42);
}

[TestMethod]
publicvoidTest_ObservableObjectAttribute_OnSealedClass_Events()
{
Assert.IsTrue(typeof(INotifyPropertyChanged).IsAssignableFrom(typeof(SampleModelSealed)));
Assert.IsTrue(typeof(INotifyPropertyChanging).IsAssignableFrom(typeof(SampleModelSealed)));

SampleModelSealed?model=new();

(PropertyChangingEventArgs,int)changing=default;
(PropertyChangedEventArgs,int)changed=default;

model.PropertyChanging+=(s,e)=>
{
Assert.IsNull(changing.Item1);
Assert.IsNull(changed.Item1);
Assert.AreSame(model,s);
Assert.IsNotNull(s);
Assert.IsNotNull(e);

changing=(e,model.Data);
};

model.PropertyChanged+=(s,e)=>
{
Assert.IsNotNull(changing.Item1);
Assert.IsNull(changed.Item1);
Assert.AreSame(model,s);
Assert.IsNotNull(s);
Assert.IsNotNull(e);

changed=(e,model.Data);
};

model.Data=42;

Assert.AreEqual(changing.Item1?.PropertyName,nameof(SampleModelSealed.Data));
Assert.AreEqual(changing.Item2,0);
Assert.AreEqual(changed.Item1?.PropertyName,nameof(SampleModelSealed.Data));
Assert.AreEqual(changed.Item2,42);
}

[ObservableObject]
publicpartialclassSampleModel
{
privateintdata;

publicintData
{
get=>this.data;
set=>SetProperty(refthis.data,value);
}
}

[ObservableObject]
publicsealedpartialclassSampleModelSealed
{
privateintdata;

publicintData
{
get=>this.data;
set=>SetProperty(refthis.data,value);
}
}
}