Add extra property test.

Author: ChebanovDD

tests/UnityMvvmToolkit.Test.Integration/BindingContextObjectProviderTests.cs

@@ -268,6 +268,26 @@ public void RentProperty_ShouldThrow_WhenBindingDataIsNotValid()
             .WithMessage(nameof(countPropertyBindingData.PropertyName));
     }
 
+    [Fact]
+    public void RentPropertyWithConverter_ShouldThrow_WhenPropertyIsReadOnly()
+    {
+        // Arrange
+        var objectProvider = new BindingContextObjectProvider(new IValueConverter[]
+        {
+            new IntToStrConverter()
+        });
+
+        var bindingContext = new MyBindingContext();
+
+        var intValueBindingData = nameof(MyBindingContext.IntValue).ToPropertyBindingData();
+
+        // Assert
+        objectProvider
+            .Invoking(sut => sut.RentReadOnlyProperty<string>(bindingContext, intValueBindingData))
+            .Should()
+            .Throw<InvalidCastException>();
+    }
+
     [Fact]
     public void RentPropertyWithConverter_ShouldThrow_WhenConverterIsNotSet()
     {
@@ -279,7 +299,7 @@ public void RentPropertyWithConverter_ShouldThrow_WhenConverterIsNotSet()
 
         // Assert
         objectProvider
-            .Invoking(objProvider => objProvider.RentProperty<string>(bindingContext, countPropertyBindingData))
+            .Invoking(sut => sut.RentProperty<string>(bindingContext, countPropertyBindingData))
             .Should()
             .Throw<NullReferenceException>()
             .WithMessage($"Property value converter from '{typeof(int)}' to '{typeof(string)}' not found.");

tests/UnityMvvmToolkit.Test.Integration/TestBindingContext/MyBindingContext.cs

@@ -1,16 +1,18 @@
 using UnityMvvmToolkit.Core;
+using UnityMvvmToolkit.Core.Attributes;
 using UnityMvvmToolkit.Core.Interfaces;
 using UnityMvvmToolkit.Test.Unit.TestCommands;
 
 // ReSharper disable InconsistentNaming
-// ReSharper disable UnusedMember.Global
 
 namespace UnityMvvmToolkit.Test.Integration.TestBindingContext;
 
 public class MyBindingContext : IBindingContext
 {
     private readonly IProperty<int> _count = new Property<int>();
-    private readonly IProperty<string> m_description = new Property<string>();
+    
+    [Observable(nameof(IntValue))]
+    private readonly IReadOnlyProperty<int> m_intValue = new ReadOnlyProperty<int>(69);
 
     public MyBindingContext(string title = "Title")
     {
@@ -32,11 +34,7 @@ public int Count
         set => _count.Value = value;
     }
 
-    public string Description
-    {
-        get => m_description.Value;
-        set => m_description.Value = value;
-    }
+    public int IntValue => m_intValue.Value;
 
     public ICommand FieldCommand;
     public ICommand IncrementCommand { get; }