MOQ Samples

MOQ like RhinoMocks uses Castle Dynamic Proxy under the covers to generate “objects” from classes or interfaces.

Here is a quick look at the MOQ Store sample contained within the source: http://code.google.com/p/moq/

Stories

Class Diagram

Tests

ShouldSetViewCategories

[Test]
public void ShouldSetViewCategories()
{
    // Arrange
    var catalog = new Mock<ICatalogService>();
    var view = new Mock<IProductsView>();

    // Act
    var presenter = new ProductsPresenter(catalog.Object, view.Object);

    // Assert
    view.Verify(v => v.SetCategories(It.IsAny<IEnumerable<Category>>()));
}

Shows how Moq generates a real object from an interface, stored in the mock object property
“Verify” extension method from Moq verifies that the expression was called on the mock object
It.IsAny<T>() is generating a default dummy value for the SetCategories, just to check it can be called

ShouldCategorySelectionSetProducts

[Test]
public void ShouldCategorySelectionSetProducts()
{
    // Arrange
    var catalog = new Mock<ICatalogService>();
    var view = new Mock<IProductsView>();
    var presenter = new ProductsPresenter(catalog.Object, view.Object);
    
    // Act
    view.Raise(
        v => v.CategorySelected += null, 
        new CategoryEventArgs(new Category { Id = 1 }));

    // Assert
    view.Verify(v => v.SetProducts(It.IsAny<IEnumerable<Product>>()));
}

Shows an event being raised on a mocked object

ShouldPlaceOrderIfEnoughInventory

[Test]
public void ShouldPlaceOrderIfEnoughInventory()
{
    // Arrange
    var catalog = new Mock<ICatalogService>();
    var view = new Mock<IProductsView>();
    var presenter = new ProductsPresenter(catalog.Object, view.Object);
    var order = new Order 
    {
        Product = new Product { Id = 1 }, 
        Quantity = 5
    };

    catalog
        .Setup(c => c.HasInventory(1, 5))
        .Returns(true);

    // Act
    presenter.PlaceOrder(order);

    // Assert
    Assert.IsTrue(order.Filled);
    catalog.Verify(c => c.HasInventory(1, 5));
}

“Setups” the result of True for the mock object if method HasInventory(1, 5) is called.
NOTE:  presenter.PlaceOrder(order) internally calls HasInventory(1, 5) to set the order.Filled property

ShouldNotPlaceOrderIfNotEnoughInventory

[Test]
public void ShouldNotPlaceOrderIfNotEnoughInventory()
{
    // Arrange
    var catalog = new Mock<ICatalogService>();
    var view = new Mock<IProductsView>();
    var presenter = new ProductsPresenter(catalog.Object, view.Object);
    var order = new Order
    {
        Product = new Product { Id = 1 },
        Quantity = 5
    };

    catalog
        .Setup(c => c.HasInventory(1, 5))
        .Returns(false);

    // Act
    presenter.PlaceOrder(order);

    // Assert
    Assert.IsFalse(order.Filled);
    catalog.Verify(c => c.HasInventory(1, 5));
}

As per the previous test notes.

ShouldNotPlaceOrderIfFailsToRemove

[Test]
public void ShouldNotPlaceOrderIfFailsToRemove()
{
    // Arrange
    var catalog = new Mock<ICatalogService>();
    var view = new Mock<IProductsView>();
    var presenter = new ProductsPresenter(catalog.Object, view.Object);
    var order = new Order
    {
        Product = new Product { Id = 1 },
        Quantity = 5
    };

    catalog
        .Setup(c => c.HasInventory(1, 5))
        .Returns(true);
    catalog
        .Setup(c => c.Remove(1, 5))
        .Throws<InvalidOperationException>();

    // Act
    presenter.PlaceOrder(order);

    // Assert
    Assert.IsFalse(order.Filled);
    catalog.Verify(c => c.HasInventory(1, 5));
    catalog.Verify(c => c.Remove(1, 5));
}

Source Code

http://stevenhollidge.com/blog-source-code/Moq-StoreSample.zip