Fixed unit tests with RelayCommand and value types

Author: Sergio0694

UnitTests/UnitTests.Shared/Mvvm/Test_AsyncRelayCommand{T}.cs

@@ -125,8 +125,8 @@ public void Test_AsyncRelayCommandOfT_NullWithValueType()
                 return Task.CompletedTask;
             });
 
-            // Special case for null value types
-            Assert.IsTrue(command.CanExecute(null));
+            Assert.IsFalse(command.CanExecute(null));
+            Assert.ThrowsException<NullReferenceException>(() => command.Execute(null));
 
             command = new AsyncRelayCommand<int>(
                 i =>
@@ -135,7 +135,8 @@ public void Test_AsyncRelayCommandOfT_NullWithValueType()
                 return Task.CompletedTask;
             }, i => i > 0);
 
-            Assert.ThrowsException<NullReferenceException>(() => command.CanExecute(null));
+            Assert.IsFalse(command.CanExecute(null));
+            Assert.ThrowsException<NullReferenceException>(() => command.Execute(null));
         }
     }
 }

UnitTests/UnitTests.Shared/Mvvm/Test_RelayCommand{T}.cs

@@ -74,12 +74,13 @@ public void Test_RelayCommand_NullWithValueType()
 
             var command = new RelayCommand<int>(i => n = i);
 
-            // Special case for null value types
-            Assert.IsTrue(command.CanExecute(null));
+            Assert.IsFalse(command.CanExecute(null));
+            Assert.ThrowsException<NullReferenceException>(() => command.Execute(null));
 
             command = new RelayCommand<int>(i => n = i, i => i > 0);
 
-            Assert.ThrowsException<NullReferenceException>(() => command.CanExecute(null));
+            Assert.IsFalse(command.CanExecute(null));
+            Assert.ThrowsException<NullReferenceException>(() => command.Execute(null));
         }
     }
 }