Create Moq Tests for all services

[Moq quickstart](https://github.com/Moq/moq4/wiki/Quickstart)

1. Open up a new issue with the name of the service you will be testing
2. Tick the box of the service you made tests for here when your done
3. Make a PR

- [ ] Recipe
- [x] Ingredient
- [ ] Restaurant
- [ ] RecipeCategory