Sample 1: Ignoring a Method Call

This sample shows:

• How to ignore a method call

• How to verify that the method was actually called during the test

APIs Used

Method	Description
Isolate.WhenCalled()	The method inside the Isolate.WhenCalled() will be ignored and will return a fake value.
Isolate.Verify.WasCalledWithExactArguments()	Verify that the method inside the Isolate.WhenCalled() was called during the test with the exact arguments.

Scenario

1. Set all calls to MessageBox.Show() to be ignored and return a fake value.

2. Call MessageBox.Show(). When running the test the MessageBox does not appear.

3. Check that the static function Show() was called during the test with the parameter "This is a message".

Code

C#

[TestMethod, Isolated]
public void SimpleTestUsingMessageBox()
{
  // Arrange
  Isolate.WhenCalled(() => MessageBox.Show(null)).WillReturn(DialogResult.OK);
  // Act
  MessageBox.Show("This is a message");
  // Assert
  Isolate.Verify.WasCalledWithExactArguments(()=>MessageBox.Show("This is a message"));
}

VB

<TestMethod, Isolated>
Public Sub SimpleTestUsingMessageBox()
    ' Arrange
    Isolate.WhenCalled(Function() MessageBox.Show(Nothing)).WillReturn(DialogResult.OK)
    ' Act
    MessageBox.Show("This is a message")
    ' Assert
    Isolate.Verify.WasCalledWithExactArguments(Function() MessageBox.Show("This is a message"))
End Sub