Faking a Private Call From a Constructor

You can control non-public methods that are called within a constructor.

Faking Private Methods

To fake private methods, use the Isolate.NonPublic. This API uses a string name of the method that you want to fake. Typemock Isolator will find the method through reflection and arrange the new behavior. To fake an instance method, pass the instance and the name of the method.

Syntax

C#
var instance = Isolate.Fake.NextInstance<ObjectToMock>(Members.CallOriginal);
Isolate.NonPublic.WhenCalled(<instance>, "<methodname>").<behavior>

VB
Dim instance = Isolate.Fake.NextInstance(Of ObjectToMock)(Members.CallOriginal)
Isolate.NonPublic.WhenCalled(<instance>, "<methodname>").<behavior>

Sample:

C#

[TestMethod, Isolated]
public void IgnorePrivateCallFromCtor()
{
    var dependency = Isolate.Fake.NextInstance<Dependency>(Members.CallOriginal);
    Isolate.NonPublic.WhenCalled(dependency, "ToUpperCase").IgnoreCall();

    var res = new ClassUnderTest().Create("typemock");

    Assert.AreEqual("typemock", res.Name);
}

 public class ClassUnderTest
{
    public Dependency Create(string name)
    {
        return new Dependency(0, name);
    }
}

 public class Dependency
{
    public int Age;
    public string Name;

    public Dependency(int age, string name)
    {
        Age = age;
        Name = name;
        ToUpperCase();
    }

    private void ToUpperCase()
    {
        Name.ToUpper();
    }
}

VB

<TestMethod, Isolated>
Public Sub IgnorePrivateCallFromCtor()
	Dim dependency = Isolate.Fake.NextInstance(Of Dependency)(Members.CallOriginal)
	Isolate.NonPublic.WhenCalled(dependency, "ToUpperCase").IgnoreCall()

	Dim res = New ClassUnderTest().Create("typemock")

	Assert.AreEqual("typemock", res.Name)
End Sub

Public Class ClassUnderTest
	Public Function Create(name As String) As Dependency
		Return New Dependency(0, name)
	End Function
End Class

Public Class Dependency
	Public Age As Integer
	Public Name As String

	Public Sub New(age As Integer, name As String)
		Age = age
		Name = name
		ToUpperCase()
	End Sub

	Private Sub ToUpperCase()
		Name.ToUpper()
	End Sub
End Class