Question

This is similar to Dependency Injection with Custom Membership Provider, but the responses there don’t solve the issue for me.

I have a custom membership provider which has a dependency to a repository class. ASP.NET will always instantiate this using the parameter-less constructor, so to resolve the dependency to the repository I have a kind of service locator method … my ctor looks like this:

public CustomMembershipProvider()
{
    _userRepository = AppStart_NinjectMVC3.Resolve<IUserRepository>();
}

And that Resolve method looks like this..

public static T Resolve<T>() where T : class
{
    return _kernel.Get<T>();
}

This works fine when I run the web app, because _kernel is correctly setup. However, I need to test the methods on my membership provider.. So when my test code tries to invoke the methods on membership provider it will instantiate a new membership provider class with the paramter-less ctor, which errors because _kernel is not setup.

What I want to do is somehow inject my FakeUserRepository class instead, but how can I achieve that?

Answer 1

I think I have a work round for this…

I’ve added a ctor to the membership provider which accepts a repository instance, and then I’ve manually instantiated my membership provider in my test class like this:

var prov = new CableSenseMembershipProvider(new FakeUserRepository());
        var config = new NameValueCollection();
        config.Add("applicationName", "ddd");
        config.Add("name", "CustomMembershipProvider");
        config.Add("requiresQuestionAndAnswer", "false");
        config.Add("requiresUniqueEmail", "false");
        prov.Initialize(config["name"], config);

Once I’ve dont this I can then invoke that instance and not worry about the parameter-less ctor being called.

As an aside, you still need to add the membership section to your test project app.config or it wont work – which is somewhat confusing!