How do you Test a service where Maui.Storage.ISecureStorage is used - maui

Question

I have to write an integration test and I have service like below
public class MyService: IMyService
{
private readonly ISecureStorage secureStorageService;
public MyService(ISecureStorage secureStorageService)
{
this.secureStorageService = secureStorageService;
}
}
How do I create an implementation of ISecureStorage in my test?
ISecureStorage mySecureStorage = new ???????

Answer 1

You can create a test implementation for it or use a mock, since you don't want to test the real SecureStorage class (you can't, really, without a lot of platform specific fuzz).
Option 1: Use the Moq library:
using Moq;
public class MyTests
{
// this conveniently takes care of the mock implementation for you
private Mock<ISecureStorage> _secureStorageMock = new Mock<ISecureStorage>();
[Test]
public void Example()
{
//arrange
var myService = new MyService(_secureStorageMock.object);
//act
myService.DoSomething();
//assert
Assert.IsTrue(myService.Whatever);
// You can also check if a specific method has been called, like below
_secureStorageMock.Verify(s => s.SetAsync(It.IsAny<string>(), It.IsAny<string>());
}
}
Option 2: Create a stub implementation:
public class FakeStorage : ISecureStorage
{
//TODO: implement interface with stub methods that don't actually do anything useful
}
Then use it in your test:
public class MyTests
{
[Test]
public void Example()
{
//arrange
var myService = new MyService(new FakeStorage());
//act
myService.DoSomething();
//assert
Assert.IsTrue(myService.Whatever);
}
}
These are just two ways to do it. More advanced scenarios could involve an inversion of control container. Also, I'm just assuming the use of NUnit here, but the same goes for xUnit, too.
I recommend approach no. 1. It's easier, more powerful and avoids writing a fake or stub implementation.