public async Task DeleteAsync_Should_Delete_Entity_From_Database()
{
// Arrange
var todoItem = Builder <TodoItem> .CreateNew().With(c => c.Id = Guid.NewGuid()).Build();
TodoItemRepository.GetFirstAsync(Arg.Any <Expression <Func <TodoItem, bool> > >()).Returns(todoItem);
TodoItemRepository.DeleteAsync(Arg.Any <TodoItem>()).Returns(todoItem);
// Act
var result = await _sut.DeleteAsync(Guid.NewGuid());
// Assert
result.Id.Should().Be(todoItem.Id);
await TodoItemRepository.Received().GetFirstAsync(Arg.Any <Expression <Func <TodoItem, bool> > >());
await TodoItemRepository.Received().DeleteAsync(Arg.Any <TodoItem>());
}