Added unit test for two way binding with conversion.

GalaSoft.MvvmLight/Tests/AndroidTestApp/Binding/BindingAccountTest.cs

@@ -17,8 +17,8 @@ namespace GalaSoft.MvvmLight.Test.Binding
     [SuppressMessage("ReSharper", "InconsistentNaming")]
     public class BindingAccountTest
     {
-        private Binding<string, string> _binding1;
-        private Binding<string, string> _binding2;
+        private Helpers.Binding _binding1;
+        private Helpers.Binding _binding2;
 
         public AccountViewModel Vm
         {
@@ -76,7 +76,7 @@ namespace GalaSoft.MvvmLight.Test.Binding
                 targetNullValue: "TargetNull");
 
             Assert.AreEqual(AccountViewModel.EmptyText, Operation.Text);
-            Assert.AreEqual(_binding2.FallbackValue, ChildName.Text);
+            Assert.AreEqual(((Binding<string, string>)_binding2).FallbackValue, ChildName.Text);
 
             Vm.SetAccount();
 

GalaSoft.MvvmLight/Tests/AndroidTestApp/Binding/BindingTest.cs

@@ -19,7 +19,7 @@ namespace GalaSoft.MvvmLight.Test.Binding
     [SuppressMessage("ReSharper", "InconsistentNaming")]
     public class BindingTest
     {
-        private Binding<string, string> _binding;
+        private Helpers.Binding _binding;
 
         public TestViewModel VmSource
         {
@@ -365,5 +365,33 @@ namespace GalaSoft.MvvmLight.Test.Binding
             _vmField.Model.MyProperty = "New value";
             Assert.AreEqual(textBox.Text, _vmField.Model.MyProperty);
         }
+
+        [Test]
+        public void Binding_SetTextBoxToTrueInTwoWayBinding_ShouldRemainLowCaps()
+        {
+            VmSource = new TestViewModel
+            {
+                Model = new TestModel()
+            };
+            VmTarget = new TestViewModel();
+
+            _binding = this.SetBinding(
+                () => VmSource.Model.MyProperty,
+                () => VmTarget.BoolProperty,
+                BindingMode.TwoWay);
+
+            Assert.AreEqual(null, VmSource.Model.MyProperty);
+            Assert.IsFalse(VmTarget.BoolProperty);
+
+            VmSource.Model.MyProperty = "true";
+
+            Assert.AreEqual("true", VmSource.Model.MyProperty);
+            Assert.IsTrue(VmTarget.BoolProperty);
+
+            VmTarget.BoolProperty = false;
+
+            Assert.IsFalse(VmTarget.BoolProperty);
+            Assert.AreEqual("False", VmSource.Model.MyProperty);
+        }
     }
 }

GalaSoft.MvvmLight/Tests/AndroidTestApp/ViewModel/TestViewModel.cs

@@ -10,6 +10,8 @@ namespace GalaSoft.MvvmLight.Test.ViewModel
     {
         public const string ValueForCommand = "Command value";
 
+        private bool _boolProperty;
+
         private DateTime _date;
         private TestModel _model;
         private TestViewModel _nested;
@@ -20,6 +22,18 @@ namespace GalaSoft.MvvmLight.Test.ViewModel
         private string _targetPropertyObservable;
         private ICommand _testCommandImpl;
 
+        public bool BoolProperty
+        {
+            get
+            {
+                return _boolProperty;
+            }
+            set
+            {
+                Set(ref _boolProperty, value);
+            }
+        }
+
         public DateTime Date
         {
             get