public async Task GetCategories_Uses_Cache_When_Data_Available()
{
var cacheService = new MockCacheService();
cacheService.DataExistsAndIsValidAsyncDelegate = s => Task.FromResult(true);
var categories = new List<Category>
{
new Category{ Id = 1},
new Category{ Id = 2}
};
cacheService.GetDataDelegate = (string s) =>
{
if (s == "Categories0")
return new ReadOnlyCollection<Category>(categories);
return new ReadOnlyCollection<Category>(null);
};
var productCatalogService = new MockProductCatalogService();
productCatalogService.GetCategoriesAsyncDelegate = (depth) => Task.FromResult(new ReadOnlyCollection<Category>(null));
var target = new ProductCatalogRepository(productCatalogService, cacheService);
var returnedCategories = await target.GetCategoriesAsync(0);
Assert.AreEqual(2, returnedCategories.Count);
Assert.AreEqual(1, returnedCategories[0].Id);
Assert.AreEqual(2, returnedCategories[1].Id);
}
public async Task GetCategories_Calls_Service_When_Cache_Miss()
{
var cacheService = new MockCacheService();
cacheService.DataExistsAndIsValidAsyncDelegate = s => Task.FromResult(false);
cacheService.SaveExternalDataAsyncDelegate = s => Task.FromResult(new Uri("http://test.org"));
cacheService.SaveDataAsyncDelegate = (s, c) => Task.FromResult(new Uri("http://test.org"));
var productCatalogService = new MockProductCatalogService();
var categories = new List<Category>
{
new Category{ Id = 1},
new Category{ Id = 2}
};
productCatalogService.GetCategoriesAsyncDelegate = (depth) => Task.FromResult(new ReadOnlyCollection<Category>(categories));
productCatalogService.GetSubcategoriesAsyncDelegate = (i) => Task.FromResult(new ReadOnlyCollection<Category>(null));
var target = new ProductCatalogRepository(productCatalogService, cacheService);
var returnedCategories = await target.GetCategoriesAsync(0);
Assert.AreEqual(2, returnedCategories.Count);
Assert.AreEqual(1, returnedCategories[0].Id);
Assert.AreEqual(2, returnedCategories[1].Id);
}
public async Task GetCategories_Saves_Data_To_Cache()
{
var cacheService = new MockCacheService();
cacheService.DataExistsAndIsValidAsyncDelegate = s => Task.FromResult(false);
cacheService.SaveExternalDataAsyncDelegate = s => Task.FromResult(new Uri("http://test.org"));
cacheService.SaveDataAsyncDelegate = (s, o) =>
{
var collection = (ReadOnlyCollection<Category>)o;
Assert.AreEqual("Categories0", s);
Assert.AreEqual(2, collection.Count);
Assert.AreEqual(1, collection[0].Id);
Assert.AreEqual(2, collection[1].Id);
return Task.FromResult(new Uri("http://test.org"));
};
var productCatalogService = new MockProductCatalogService();
var categories = new List<Category>
{
new Category{ Id = 1},
new Category{ Id = 2}
};
productCatalogService.GetCategoriesAsyncDelegate = (depth) => Task.FromResult(new ReadOnlyCollection<Category>(categories));
productCatalogService.GetSubcategoriesAsyncDelegate =
i => Task.FromResult(new ReadOnlyCollection<Category>(null));
var target = new ProductCatalogRepository(productCatalogService, cacheService);
await target.GetCategoriesAsync(0);
}