I have a unit test where I have to mock a non-virtual method that returns a bool type
public class XmlCupboardAccess { public bool IsDataEntityInXmlCupboard(string dataId, out string nameInCupboard, out string refTypeInCupboard, string nameTemplate = null) { return IsDataEntityInXmlCupboard(_theDb, dataId, out nameInCupboard, out refTypeInCupboard, nameTemplate); } }
So I have a mock object of XmlCupboardAccess class and I am trying to setup mock for this method in my test case as shown below
[TestMethod] Public void Test() { private string temp1; private string temp2; private Mock _xmlCupboardAccess = new Mock(); _xmlCupboardAccess.Setup(x => x.IsDataEntityInXmlCupboard(It.IsAny(), out temp1, out temp2, It.IsAny())).Returns(false); //exception is thrown by this line of code }
But this line throws exception
Invalid setup on a non-virtual (overridable in VB) member: x => x.IsDataEntityInXmlCupboard(It.IsAny(), .temp1, .temp2, It.IsAny())
Any suggestion how to get around this exception?
Moq cannot mock non-virtual methods and sealed classes. While running a test using mock object, MOQ actually creates an in-memory proxy type which inherits from your "XmlCupboardAccess" and overrides the behaviors that you have set up in the "SetUp" method. And as you know in C#, you can override something only if it is marked as virtual which isn't the case with Java. Java assumes every non-static method to be virtual by default.
Another thing I believe you should consider is introducing an interface for your "CupboardAccess" and start mocking the interface instead. It would help you decouple your code and have benefits in the longer run.
Lastly, there are frameworks like : TypeMock and JustMock which work directly with the IL and hence can mock non-virtual methods. Both however, are commercial products.
Please see Why does the property I want to mock need to be virtual?
You may have to write a wrapper interface or mark the property as virtual/abstract as Moq creates a proxy class that it uses to intercept calls and return your custom values that you put in the .Returns(x) call.
Code:
private static void RegisterServices(IKernel kernel) { Mock mock=new Mock(); mock.Setup(x => x.Products).Returns(new List { new Product {Name = "Football", Price = 23}, new Product {Name = "Surf board", Price = 179}, new Product {Name = "Running shose", Price = 95} }); kernel.Bind().ToConstant(mock.Object); }
but see exception.
