初始化

linesider_screen_bankend/Tests/linesider_screen_bankend.Modules.ModuleName.Tests/ViewModels/ViewAViewModelFixture.cs

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+using linesider_screen_bankend.Modules.ModuleName.ViewModels;
+using linesider_screen_bankend.Services.Interfaces;
+using Moq;
+using Prism.Regions;
+using Xunit;
+
+namespace linesider_screen_bankend.Modules.ModuleName.Tests.ViewModels
+{
+    public class ViewAViewModelFixture
+    {
+        Mock<IMessageService> _messageServiceMock;
+        Mock<IRegionManager> _regionManagerMock;
+        const string MessageServiceDefaultMessage = "Some Value";
+
+        public ViewAViewModelFixture()
+        {
+            var messageService = new Mock<IMessageService>();
+            messageService.Setup(x => x.GetMessage()).Returns(MessageServiceDefaultMessage);
+            _messageServiceMock = messageService;
+
+            _regionManagerMock = new Mock<IRegionManager>();
+        }
+
+        [Fact]
+        public void MessagePropertyValueUpdated()
+        {
+            var vm = new ViewAViewModel(_regionManagerMock.Object, _messageServiceMock.Object);
+
+            _messageServiceMock.Verify(x => x.GetMessage(), Times.Once);
+
+            Assert.Equal(MessageServiceDefaultMessage, vm.Message);
+        }
+
+        [Fact]
+        public void MessageINotifyPropertyChangedCalled()
+        {
+            var vm = new ViewAViewModel(_regionManagerMock.Object, _messageServiceMock.Object);
+            Assert.PropertyChanged(vm, nameof(vm.Message), () => vm.Message = "Changed");
+        }
+    }
+}