[英]How do I mock these classes using moq
請有人告訴我如何正確模擬此存儲庫類。 基本上,我只是想模擬它,以便可以輕松測試服務層。 我的測試項目中使用的是c#moq。 問題最多的是Query,Filter,Include和OrderBy方法中使用的虛擬接口模式。 我如何對其進行模擬,以便它可以返回正確注入到Repository模擬中的RepositoryQuery。
下面顯示的代碼是與數據庫通信的數據庫層的一部分,因此我想對其進行模擬,以便可以輕松測試服務層而無需外部依賴。
public sealed class RepositoryQuery<TEntity> : IRepositoryQuery<TEntity> where TEntity : BaseEntity
{
private readonly List<Expression<Func<TEntity, object>>> _includeProperties;
private readonly Repository<TEntity> _repository;
private readonly List<Expression<Func<TEntity, bool>>> _filters;
private Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> _orderByQuerable;
private int? _page;
private int? _pageSize;
public RepositoryQuery(Repository<TEntity> repository)
{
_repository = repository;
_includeProperties = new List<Expression<Func<TEntity, object>>>();
_filters = new List<Expression<Func<TEntity, bool>>>();
}
public RepositoryQuery<TEntity> Filter(Expression<Func<TEntity, bool>> filter)
{
_filters.Add(filter);
return this;
}
public RepositoryQuery<TEntity> OrderBy(Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy)
{
_orderByQuerable = orderBy;
return this;
}
public RepositoryQuery<TEntity> Include(Expression<Func<TEntity, object>> expression)
{
_includeProperties.Add(expression);
return this;
}
public IQueryable<TEntity> Get()
{
return _repository.Get(_filters, _orderByQuerable, _includeProperties, _page, _pageSize);
}
}
和這個
public class Repository<TEntity> : IRepository<TEntity> where TEntity : BaseEntity
{
private readonly Guid _instanceId;
private readonly DbSet<TEntity> _dbSet;
private readonly IDbContext _context;
public Repository(IDbContext context)
{
_context = context;
_dbSet = context.Set<TEntity>();
_instanceId = Guid.NewGuid();
}
public virtual IRepositoryQuery<TEntity> Query()
{
var repositoryGetFluentHelper = new RepositoryQuery<TEntity>(this);
return repositoryGetFluentHelper;
}
internal IQueryable<TEntity> Get(
List<Expression<Func<TEntity, bool>>> filters = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
List<Expression<Func<TEntity, object>>> includeProperties = null,
int? page = null,
int? pageSize = null)
{
IQueryable<TEntity> query = _dbSet;
if (includeProperties != null)
{
includeProperties.ForEach(i => query = query.Include(i));
}
if (filters != null && filters.Any())
{
query = filters.Aggregate(query, (current, filter) => current.Where(filter));
}
query = orderBy != null ? orderBy(query) : query.OrderBy(a => a.Id);
if (page != null && pageSize != null)
{
query = query
.Skip((page.Value - 1)*pageSize.Value)
.Take(pageSize.Value);
}
return query;
}
}
希望您的組件依賴於IRepositoryQuery<TEntity>
和IRepository<TEntity>
,而不依賴於具體的實現RepositoryQuery<TEntity>
和Repository<TEntity>
。 如果是這種情況,那么您可以為Moq提供用於接口測試的接口測試倍數,如下所示
var mockQuery = new Mock<IRepositoryQuery<TEntity>>();
// perform any setup needed on mockQuery for the particular System Under Test
var mockRepository = new Mock<IRepository<TEntity>>();
// perform any setup needed on mockRepository for the particular System Under Test
// component that relies on query and repository
// that is the System Under Test i.e. the focus of the unit test
var systemUnderTest = new SystemUnderTest(mockRepository.Object, mockQuery.Object);
觀察; 查看RepositoryQuery<TEntity>
,我認為這些方法應該返回接口IRepositoryQuery<TEntity>
,而不是具體的實現RepositoryQuery<TEntity>
。
如果IRepositoryQuery
是包裝IRepository
,那么-要測試你的服務層-你不必嘲笑IRepository
。 只是模擬IRepositoryQuery
。
假設我要檢查SomeService.DoSomething
是否正確處理了從IRepositoryQuery.Get
獲得的結果:
var mock = new Mock<IRepositoryQuery<SomeClass>>();
mock.Setup(o => o.Get(/* test parameters */)).Returns(/* result */);
var myService = new SomeService(mock.Object);
Assert.That(myService.DoSomething(), Is.EqualTo(/* expected result*/));
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