April 28 2014
Moq - Get Setup() to return a dynamic collection from a fake repository
Use Moq lazy loading to return an updated collection from the Setup() method, it's as easy as changing the argument to the Setup().Returns() method from an object to a lambda expression.
So if you've got this:
_mockUserRepository.Setup(x => x.GetAll()).Returns(FakeUserData.Users);Just change it to this:
_mockUserRepository.Setup(x => x.GetAll()).Returns(() => FakeUserData.Users);
If you are using this approach you also need to remember to reset your fake data at the beginning of each test, I do this with a simple static reset method on my fake data class.
class FakeUserData
{
public static void Reset()
{
_users = null;
}
...
}Which is called before each test with the following setup method (using MSTest):
[TestInitialize]
public void Setup()
{
FakeUserData.Reset();
...
}
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