diff --git a/framework/test/Volo.Abp.AutoMapper.Tests/AutoMapper/AbpAutoMapperExtensibleDtoExtensions_Tests.cs b/framework/test/Volo.Abp.AutoMapper.Tests/AutoMapper/AbpAutoMapperExtensibleDtoExtensions_Tests.cs
index d0ee7db52d..4ec19bb84e 100644
--- a/framework/test/Volo.Abp.AutoMapper.Tests/AutoMapper/AbpAutoMapperExtensibleDtoExtensions_Tests.cs
+++ b/framework/test/Volo.Abp.AutoMapper.Tests/AutoMapper/AbpAutoMapperExtensibleDtoExtensions_Tests.cs
@@ -34,10 +34,10 @@ namespace AutoMapper
 
             personDto.GetProperty<string>("Name").ShouldBe("John"); //Defined in both classes
             personDto.GetProperty<string>("ExistingDtoProperty").ShouldBe("existing-value"); //Should not clear existing values
+            personDto.GetProperty<int>("ChildCount").ShouldBe(0); //Not defined in the source, but was set to the default value by ExtensibleTestPersonDto constructor
+            personDto.GetProperty("CityName").ShouldBeNull(); //Ignored, but was set to the default value by ExtensibleTestPersonDto constructor
             personDto.HasProperty("Age").ShouldBeFalse(); //Not defined on the destination
-            personDto.HasProperty("ChildCount").ShouldBeFalse(); //Not defined in the source
             personDto.HasProperty("Sex").ShouldBeFalse(); //Not defined in both classes
-            personDto.HasProperty("CityName").ShouldBeFalse(); //Ignored
         }
     }
 }
diff --git a/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/AbpObjectExtendingTestModule.cs b/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/AbpObjectExtendingTestModule.cs
index 3eff9846f7..ba7091befa 100644
--- a/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/AbpObjectExtendingTestModule.cs
+++ b/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/AbpObjectExtendingTestModule.cs
@@ -23,7 +23,7 @@ namespace Volo.Abp.ObjectExtending
                     .AddOrUpdateProperty<ExtensibleTestPerson, string>("CityName")
                     .AddOrUpdateProperty<ExtensibleTestPersonDto, string>("Name")
                     .AddOrUpdateProperty<ExtensibleTestPersonDto, int>("ChildCount")
-                    .AddOrUpdateProperty<ExtensibleTestPersonDto, int>("CityName");
+                    .AddOrUpdateProperty<ExtensibleTestPersonDto, string>("CityName");
             });
         }
     }
diff --git a/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/ExtensibleObjectValidator_Tests.cs b/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/ExtensibleObjectValidator_Tests.cs
index 8c27844e22..83ecc3100f 100644
--- a/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/ExtensibleObjectValidator_Tests.cs
+++ b/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/ExtensibleObjectValidator_Tests.cs
@@ -55,7 +55,7 @@ namespace Volo.Abp.ObjectExtending
                                         context.ValidationErrors.Add(
                                             new ValidationResult(
                                                 "If you specify a password, then please correctly repeat it!",
-                                                new[] {"Password", "PasswordRepeat"}
+                                                new[] { "Password", "PasswordRepeat" }
                                             )
                                         );
                                     }
@@ -84,14 +84,9 @@ namespace Volo.Abp.ObjectExtending
         {
             ExtensibleObjectValidator
                 .GetValidationErrors(
-                    new ExtensiblePersonObject
-                    {
-                        ExtraProperties =
-                        {
-                            {"Name", "John"},
-                            {"Age", "42"},
-                        }
-                    }
+                    new ExtensiblePersonObject()
+                        .SetProperty("Name", "John")
+                        .SetProperty("Age", 42)
                 ).Count.ShouldBe(0); //All Valid
         }
 
@@ -105,62 +100,37 @@ namespace Volo.Abp.ObjectExtending
 
             ExtensibleObjectValidator
                 .GetValidationErrors(
-                    new ExtensiblePersonObject
-                    {
-                        ExtraProperties =
-                        {
-                            {"Address", new string('x', 256) }
-                        }
-                    }
+                    new ExtensiblePersonObject()
+                        .SetProperty("Address", new string('x', 256))
                 ).Count.ShouldBe(3); // Name, Age & Address
 
             ExtensibleObjectValidator
                 .GetValidationErrors(
-                    new ExtensiblePersonObject
-                    {
-                        ExtraProperties =
-                        {
-                            {"Age", "42" }
-                        }
-                    }
+                    new ExtensiblePersonObject()
+                        .SetProperty("Age", 42)
                 ).Count.ShouldBe(1); // Name
 
             ExtensibleObjectValidator
                 .GetValidationErrors(
-                    new ExtensiblePersonObject
-                    {
-                        ExtraProperties =
-                        {
-                            {"Address", new string('x', 256) },
-                            {"Age", "100" }
-                        }
-                    }
+                    new ExtensiblePersonObject()
+                        .SetProperty("Address", new string('x', 256))
+                        .SetProperty("Age", 100)
                 ).Count.ShouldBe(3); // Name, Age & Address
 
             ExtensibleObjectValidator
                 .GetValidationErrors(
-                    new ExtensiblePersonObject
-                    {
-                        ExtraProperties =
-                        {
-                            {"Name", "John"},
-                            {"Age", "42"},
-                            {"Password", "123"},
-                            {"PasswordRepeat", "1256"}
-                        }
-                    }
+                    new ExtensiblePersonObject()
+                        .SetProperty("Name", "John")
+                        .SetProperty("Age", 42)
+                        .SetProperty("Password", "123")
+                        .SetProperty("PasswordRepeat", "1256")
                 ).Count.ShouldBe(1); // PasswordRepeat != Password
 
             ExtensibleObjectValidator
                 .GetValidationErrors(
-                    new ExtensiblePersonObject
-                    {
-                        ExtraProperties =
-                        {
-                            {"Name", "BadValue"},
-                            {"Age", "42"},
-                        }
-                    }
+                    new ExtensiblePersonObject()
+                        .SetProperty("Name", "BadValue")
+                        .SetProperty("Age", 42)
                 ).Count.ShouldBe(1); //Name is 'BadValue'!
         }
 
diff --git a/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/HasExtraPropertiesObjectExtendingExtensions_Tests.cs b/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/HasExtraPropertiesObjectExtendingExtensions_Tests.cs
index e871aeb056..5d019daf48 100644
--- a/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/HasExtraPropertiesObjectExtendingExtensions_Tests.cs
+++ b/framework/test/Volo.Abp.ObjectExtending.Tests/Volo/Abp/ObjectExtending/HasExtraPropertiesObjectExtendingExtensions_Tests.cs
@@ -34,7 +34,7 @@ namespace Volo.Abp.ObjectExtending
             _personDto.GetProperty<string>("NoPairCheck").ShouldBe("test-value"); //CheckPairDefinitionOnMapping = false
             _personDto.GetProperty<string>("ExistingDtoProperty").ShouldBe("existing-value"); //Should not clear existing values
             _personDto.HasProperty("Age").ShouldBeFalse(); //Not defined on the destination
-            _personDto.HasProperty("ChildCount").ShouldBeFalse(); //Not defined in the source
+            _personDto.GetProperty<int>("ChildCount").ShouldBe(0); //Not defined in the source, but was set to the default in the constructor
             _personDto.HasProperty("Sex").ShouldBeFalse(); //Not defined in both classes
         }
 
@@ -46,9 +46,9 @@ namespace Volo.Abp.ObjectExtending
             _personDto.GetProperty<string>("Name").ShouldBe("John"); //Defined in both classes
             _personDto.GetProperty<string>("NoPairCheck").ShouldBe("test-value"); //CheckPairDefinitionOnMapping = false
             _personDto.GetProperty<string>("ExistingDtoProperty").ShouldBe("existing-value"); //Should not clear existing values
-            _personDto.HasProperty("CityName").ShouldBeFalse(); //Ignored!
+            _personDto.GetProperty<string>("CityName").ShouldBeNull(); //Ignored, but was set to the default in the constructor
             _personDto.HasProperty("Age").ShouldBeFalse(); //Not defined on the destination
-            _personDto.HasProperty("ChildCount").ShouldBeFalse(); //Not defined in the source
+            _personDto.GetProperty<int>("ChildCount").ShouldBe(0); //Not defined in the source, but was set to the default in the constructor
             _personDto.HasProperty("Sex").ShouldBeFalse(); //Not defined in both classes
         }
 
@@ -61,7 +61,7 @@ namespace Volo.Abp.ObjectExtending
             _personDto.GetProperty<string>("CityName").ShouldBe("Adana"); //Defined in both classes
             _personDto.GetProperty<int>("Age").ShouldBe(42); //Defined in source
             _personDto.GetProperty<string>("ExistingDtoProperty").ShouldBe("existing-value"); //Should not clear existing values
-            _personDto.HasProperty("ChildCount").ShouldBeFalse(); //Not defined in the source
+            _personDto.GetProperty<int>("ChildCount").ShouldBe(0); //Not defined in the source, but was set to the default in the constructor
             _personDto.HasProperty("Sex").ShouldBeFalse(); //Not defined in both classes
         }