Prism/tests/Prism.Core.Tests/Mvvm/BindableBaseFixture.cs

using System.ComponentModel;
using System.Reflection;
using Prism.Mvvm;
using Prism.Tests.Mocks.ViewModels;
using Xunit;

namespace Prism.Tests.Mvvm
{
    public class BindableBaseFixture
    {
        [Fact]
        public void BindableMarkerIsInheritedByViewModels()
        {
            Assert.True(typeof(BindableBase).GetCustomAttribute<BindableAttribute>()?.Bindable);
            Assert.True(typeof(MockViewModel).GetCustomAttribute<BindableAttribute>(inherit: true)?.Bindable);
        }

        [Fact]
        public void SetPropertyMethodShouldSetTheNewValue()
        {
            int value = 10;
            MockViewModel mockViewModel = new MockViewModel();

            Assert.Equal(0, mockViewModel.MockProperty);

            mockViewModel.MockProperty = value;
            Assert.Equal(value, mockViewModel.MockProperty);
        }

        [Fact]
        public void SetPropertyMethodShouldNotSetTheNewValue()
        {
            int value = 10, newValue = 10;
            MockViewModel mockViewModel = new MockViewModel();
            mockViewModel.MockProperty = value;

            bool invoked = false;
            mockViewModel.PropertyChanged += (o, e) => { if (e.PropertyName.Equals("MockProperty")) invoked = true; };
            mockViewModel.MockProperty = newValue;

            Assert.False(invoked);
            Assert.Equal(value, mockViewModel.MockProperty);
        }

        [Fact]
        public void SetPropertyMethodShouldRaisePropertyRaised()
        {
            bool invoked = false;
            MockViewModel mockViewModel = new MockViewModel();

            mockViewModel.PropertyChanged += (o, e) => { if (e.PropertyName.Equals("MockProperty")) invoked = true; };
            mockViewModel.MockProperty = 10;

            Assert.True(invoked);
        }

        [Fact]
        public void OnPropertyChangedShouldExtractPropertyNameCorrectly()
        {
            bool invoked = false;
            MockViewModel mockViewModel = new MockViewModel();

            mockViewModel.PropertyChanged += (o, e) => { if (e.PropertyName.Equals("MockProperty")) invoked = true; };
            mockViewModel.InvokeOnPropertyChanged();

            Assert.True(invoked);
        }
    }
}