public void ShouldLoadASubsetOfCategories()
        {
            // Arrange
            var ids = new[] { "id" };
            var category = new Category { Name = "Important" };
            var expectedCategories = new[] { category };

            // Depedent-On Component
            var session = Substitute.For<IDocumentSession>();

            // Indirect Input
            session.Load<Category>(ids).Returns(expectedCategories);

            // System under Test
            var repository = new RavenDbRepository(session);

            // Act
            IEnumerable<Category> categories = repository.GetAllCategories(ids);

            // Assert
            Assert.That(categories, Is.EquivalentTo(expectedCategories));
            Assert.That(categories.First().Name, Is.EqualTo(category.Name));
        }
        public void ShouldLoadAllCateogoriesIfNoIdsWereProvided()
        {
            // Arrange
            var category = new Category { Name = "Important" };
            var expectedCategories = new List<Category> { category };

            // Depedent-On Component
            var session = Substitute.For<IDocumentSession>();
            var query = Substitute.For<IRavenQueryable<Category>>();

            // Indirect Input
            session.Query<Category>().Returns(query);
            query.GetEnumerator().Returns(expectedCategories.GetEnumerator());

            // System under Test
            var repository = new RavenDbRepository(session);

            // Act
            IEnumerable<Category> categories = repository.GetAllCategories(null);

            // Assert
            Assert.That(categories, Is.EquivalentTo(expectedCategories));
            Assert.That(categories.First().Name, Is.EqualTo(category.Name));
        }