[TestClass]
public class ExampleTestsForReadMe
{
    public class Model
    {
        public int Id { get; set; }
    }
    public interface IRepository
    {
        bool Save(Model model);
    }
    public interface ILog
    {
        void Log(string message);
    }
    public class Service
    {
        private readonly ILog _log;
        private readonly IRepository _repo;
        public Service(ILog log, IRepository repo)
        {
            _log = log;
            _repo = repo;
        }
        public Model SaveModel(Model model)
        {
            try
            {
                var saved = _repo.Save(model);
                if (!saved)
                {
                    _log.Log("Failed to save");
                }
                return model;
            }
            catch (Exception ex)
            {
                _log.Log(ex.Message);
                throw;
            }
        }
    }

    [TestMethod]
    public void CallsSaveTest()
    {
        var id = 22;
        var wasSaved = false;
        var log = Overmock.AnyInvocation<ILog>();
        var repository = Overmock.Mock<IRepository>()
            .Mock(r => r.Save(Its.Any<Model>()))
            .ToCall(c => {
                wasSaved = true;
                return c.Get<Model>("model")?.Id == id;
            }, Times.Once);

        var service = new Service(log, repository.Target);
        service.SaveModel(new Model { Id = id });

        Assert.IsTrue(wasSaved);
    }

    [TestMethod]
    public void ThrowsExceptionWhenSaveFailsTest()
    {
        var expected = "Failed to save";
        var log = Overmock.AnyInvocation<ILog>();
        var repository = Overmock.Mock<IRepository>();
        Overmock.Mock(repository, r => r.Save(Its.Any<Model>()))
            .ToThrow(new Exception(expected));

        var service = new Service(log, repository.Target);

        try
        {
            service.SaveModel(new Model());

            Assert.Fail("SaveModel Failed to throw an exception.");
        }
        catch (Exception actual)
        {
            Assert.AreEqual(expected, actual.Message);
        }
    }
}