OverviewVMTests with test for repo exception

OverviewVMTests.cs

    [Test]
    public async Task LoadData_sets_IsFaulted_to_true_if_LoadData_encounters_an_exception()
    {
        // Arrange
        Mock<IRepository<ToDoItem>> repoMock = new Mock<IRepository<ToDoItem>>();
        repoMock.Setup(repo => repo.GetAsync()).ThrowsAsync(new Exception());

        OverviewVM vm = new OverviewVM(repoMock.Object);

        // Act
        await vm.LoadData();

        // Assert
        Assert.That(vm.IsFaulted, Is.True);
        Assert.That(vm.ErrorMessage, Is.EqualTo("Unable to Load ToDo Items"));
    }