When to Use

When your test requires a fake property to behave as an auto-property, and you have public set and get.

Syntax

C#

var fakeDependency = Isolate.Fake.Instance<Dependency>();
fakeDependency.Number = <value> // sets the property to return the value

VB

Dim fakeDependency = FakeInstance(Of <Dependency>)()
fakeDependency.Number = <value> ' sets the property to return the value

Samples

Sample 1: Using True Properties

C#

[TestMethod, Isolated]
public void FakeAutoProperty()
{
  var fakeDependency = Isolate.Fake.Instance<Dependency>();
  fakeDependency.Number = 5; // sets the property to return 5
  Assert.AreEqual(5, fakeDependency.Number);
}

VB

<TestMethod(), Isolated()>
Public Sub FakeAutoProperty()
  Dim fakeDependency = FakeInstance(Of <Dependency>)()
  fakeDependency.Number = 5 ' sets the property to return 5
  Assert.AreEqual(5, fakeDependency.Number)
End Sub

Sample 2: Using True Properties for Members.CallOriginal() Fakes

An ability to use true properties is not applied when Members.CallOriginal() is used because the original implementation will be executed. In this case, if you want to use true properties, use Isolate.WhenCalled().ReturnRecursiveFake() on that property as follows:

C#

var dependency = new Dependency(); // not fake
Isolate.WhenCalled(() => dependency.Number).ReturnRecursiveFake(); // Number will act like an auto property
dependency.Number = 5;

VB

Dim dependency = New Dependency() ' not fake
Using TheseCalls.WillReturnRecursiveFake ' Number will act like an auto property
  Dim dummy = dependency.Number
End Using