Mock Non-Abstract and Non-Virtual Classes or Members
The advanced features supported inTelerik® JustMockenables you to mock any class or member, including non-virtual and non-abstract implementations. The mocking ofnon-abstract classesis also available in the free edition but it only supports mocking a concrete class with virtual methods. The commercial version also includesmocking of non-abstract and non-virtual membersof classes.
The commercial edition allows you to mock concrete objects without having to change anything in their interface.
This is an elevated feature. Refer tothistopic to learn more about the differences between the commercial and the free versions of Telerik JustMock.
Here is the example class we are going to use:
Sample setup
public class Customer { public Customer() { throw new NotImplementedException("Constructor"); } public string Name { get; set; } public int GetNumberOfOrders() { throw new NotImplementedException(); } public int GetNumberOfOrders(bool includeCompleted) { throw new NotImplementedException(); } public void AddOrder(string productName) { throw new NotImplementedException(); } public delegate void OrderAddedEventHandler(bool added); public event OrderAddedEventHandler OnOrderAddedCallback; }Public Class Customer Public Sub New() Throw New NotImplementedException("Constructor") End Sub Public Property Name As String Public Function GetNumberOfOrders() As Integer Throw New NotImplementedException() End Function Public Function GetNumberOfOrders(ByVal includeCompleted As Boolean) As Integer Throw New NotImplementedException() End Function Public Sub AddOrder(ByVal productName As String) Throw New NotImplementedException() End Sub Public Delegate Sub OrderAddedEventHandler(ByVal added As Boolean) Public Event OnOrderAddedCallback As OrderAddedEventHandler End ClassImportant
To use this kind of object mocking, you first need to go to elevated mode by enabling Telerik JustMock from the menu. Learn how to do that in theHow to Enable/Disable Telerik JustMocktopic.
Arrange Property
You can arrange the property get and set even when the property is not marked as abstract or virtual.
Example 1: Mock concrete implementation of property getter
[TestMethod] public void ShouldSetupACallToAFinalProperty() { // Arrange var customerMock = Mock.Create(); Mock.Arrange(() => customerMock.Name).Returns("TestName"); // Act var actual = string.Empty; actual = customerMock.Name; // Assert Assert.AreEqual("TestName", actual); } Public Sub ShouldSetupACallToAFinalProperty() ' Arrange Dim customerMock = Mock.Create(Of Customer)() Mock.Arrange(Function() customerMock.Name).Returns("TestName") ' Act Dim actual = String.Empty actual = customerMock.Name ' Assert Assert.AreEqual("TestName", actual) End Sub Example 2defines that setting the finalcustomerMock。名字property to any string value other than"TestName"will cause an exception of typeStrictMockExceptionto be thrown.
If you would like to learn more about mocking properties, check theMock Propertieshelp topic.
Example 2: Mock concrete implementation of property setter
[TestMethod] [ExpectedException(typeof(StrictMockException))] public void ShouldAssertPropertySet() { // Arrange var customerMock = Mock.Create(Behavior.Strict); Mock.ArrangeSet(() => customerMock.Name = "TestName"); // Act customerMock.Name = "Sample"; } Public Sub ShouldAssertPropertySet() ' Arrange Dim customerMock = Mock.Create(Of Customer)(Behavior.Strict) Mock.ArrangeSet(Function() customerMock.Name = "TestName") ' Act customerMock.Name = "Sample" End Sub Arrange Method
Note that here we are going to mock an instance of theCustomerclass in the same way as we would do that for non-abstract classes whose members are declared asvirtual.
Example 3: Mock concrete implementation of class and its members
[TestMethod] [ExpectedException(typeof(NotImplementedException))] public void ShouldCallOriginalForNonVirtualExactlyOnce() { // Arrange // Create a mock of the object var customerMock = Mock.Create(); // Arrange your expectations Mock.Arrange(() => customerMock.GetNumberOfOrders()).CallOriginal().OccursOnce(); //Act customerMock.GetNumberOfOrders(); //Assert Mock.Assert(customerMock); } Public Sub ShouldCallOriginalForNonVirtualExactlyOnce() ' Arrange ' Create a mock of the object Dim customerMock = Mock.Create(Of Customer)() ' Arrange your expectations Mock.Arrange(Function() customerMock.GetNumberOfOrders()).CallOriginal().OccursOnce() ' Act customerMock.GetNumberOfOrders() ' Assert Mock.Assert(customerMock) End Sub Generic methods and classes can also be mocked. Check theGenericstopic for more details on that functionality.
Arrange Method Overloads
The following example shows how to mock different overloads of the concrete implementation of a method.Customer.GetNumberOfOrdershas two overloads - one without arguments and one with a boolean argument. Here we mock them both by Returns. In the first case, we return just the argument that has been passed. In the second case we return the sum of the two integer values. After that, we act by calling both overloads and assert what we have arranged.
Example 4: Mock concrete implementation of methods with overloads
[TestMethod] public void ShouldAssertOnMethodOverload() { // Arrange var customerMock = Mock.Create(); Mock.Arrange(() => customerMock.GetNumberOfOrders()).Returns(30); Mock.Arrange(() => customerMock.GetNumberOfOrders(Arg.Is(true))).Returns(10); // Assert Assert.AreEqual(customerMock.GetNumberOfOrders(), 30); Assert.AreEqual(customerMock.GetNumberOfOrders(true), 10); } Public Sub ShouldAssertOnMethodOverload() ' Arrange Dim customerMock = Mock.Create(Of Customer)() Mock.Arrange(Function() customerMock.GetNumberOfOrders()).Returns(30) Mock.Arrange(Function() customerMock.GetNumberOfOrders(Arg.Is)).Returns(10) ' Assert Assert.AreEqual(customerMock.GetNumberOfOrders(), 30) Assert.AreEqual(customerMock.GetNumberOfOrders(True), 10) End Sub Arrange Method Callbacks
在这个sections, you will find how to use theRaisesmethod to fire a callback and pass event arguments once a final method is called.
Example 5: Fire callback and pass event arguments when non-virtual method is called
[TestMethod] public void ShouldAssertOnMethodCallbacks() { // Arrange var customerMock = Mock.Create(); Mock.Arrange(() => customerMock.AddOrder(Arg.IsAny())).Raises(() => customerMock.OnOrderAddedCallback += null, true); bool called = false; customerMock.OnOrderAddedCallback += delegate (bool added) { called = added; }; // Act customerMock.AddOrder("test"); // Assert Assert.IsTrue(called); } Public Sub ShouldAssertOnMethodCallbacks() ' Arrange Dim customerMock = Mock.Create(Of Customer)() Mock.Arrange(Function() customerMock.AddOrder(Arg.IsAny(Of String)())).Raises(Sub() AddHandler customerMock.OnOrderAddedCallback, Nothing, True) Dim called As Boolean = False AddHandler customerMock.OnOrderAddedCallback, Sub(added As Boolean) called = added ' Act customerMock.AddOrder("test") ' Assert Assert.IsTrue(called) End Sub More information on raising mocked events is available in theBasic Usage | Raisetopic.