Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test Basic Structure of a Unit Test

Basic Structure of a Unit Test

The following example shows the basic structure of a unit test:

      The test starts with the [Isolated] attribute. This attribute ensures that the fakes are cleaned up after the test.

      The test consists of the following stages:

      Arrange, in which test preconditions are defined and test objects are set up

      Act, in which the code under test is called

      Assert, in which test results are inspected and failures are reported

    A single point of entry is the Isolate statement. All mocking capabilities are available through this statement.

      DateTime.Now() is faked and returns the date every time this method is called.

 You can find all code examples in the Examples folder installed with Typemock Isolator.

C#

public class MyCode
{
  public static int DoSomethingSpecialOnALeapYear()
  {
    if ((DateTime.Now.Month == 2) && (DateTime.Now.Day == 29))
      return 100;
    else
      return 0;
  }
}

[TestMethod, Isolated]        
public void BasicUnitTestStructure()
{
  // Arrange 
  Isolate.WhenCalled(() => DateTime.Now).WillReturn(new DateTime(2016, 2, 29));

  // Act 
  int result = MyCode.DoSomethingSpecialOnALeapYear();

  // Assert 
  Assert.AreEqual(100, result);
}

VB

Public Class MyCode
  Public Shared Function DoSomethingSpecialOnALeapYear() As Integer
    If (DateTime.Now.Month = 2) AndAlso (DateTime.Now.Day = 29) Then
      Return 100
    Else
      Return 0
    End If
  End Function
End Class 
    
<TestMethod(), Isolated()> _
Public Sub BasicTestStructure()
  ' Arrange
  Isolate.WhenCalled(Function() DateTime.Now).WillReturn(New DateTime(2016, 2, 29))
 
  ' Act
  Dim result As Integer = My_Class.DoSomethingSpecialOnALeapYear()
 
  ' Assert
  Assert.AreEqual(100, result)
End Sub

 The Mocking API uses Lambda Expression to pass faked methods. This syntax is defined in .NET framework 3.5 and allows the API to be readable and strongly typed and support Intellisense within MS Visual Studio.