我想对一个具有模拟DbContext
的仓库的检索方法进行单元测试,但我无法将模拟的DbSet
值设置为仓库。
该仓库如下:
public class ChangeLogRepository : Repository<ChangeLog>, IChangeLogRepository
{
public ChangeLogRepository(IDbContext context, long tenantId) : base(context, tenantId)
{
}
}
基础类:
public class Repository<TEntity> where TEntity : class {
protected readonly IDbContext Context;
protected DbSet<TEntity> Entities { get; set; }
public long TenantId { get; set; }
protected Repository(IDbContext context, long tenant)
{
Context = context;
TenantId = tenant;
Entities = Context.Set<TEntity>();
}
public List<TEntity> GetAll()
{
return Entities.ToList();
}
//..
}
最后但同样重要的是,测试类:
[TestClass]
public class ChangeLogRepository_Test
{
private ChangeLogRepository repository;
private List<ChangeLog> allTestData;
[TestInitialize]
public void TestInitialize()
{
var dbContext = new Mock<IDbContext>();
allTestData = new List<ChangeLog>() {
new ChangeLog { Id = 10, EntityName = "User",PropertyName = "UserName",PrimaryKeyValue = 1,OldValue = "Max",NewValue = "Moritz",DateChanged = DateTime.Now,FieldType = ChangeLogFieldType.Default },
new ChangeLog { Id = 10, EntityName = "User",PropertyName = "CreatedAt",PrimaryKeyValue =2,OldValue = "15/06/2017",NewValue = "15/06/2017",DateChanged = DateTime.Now,FieldType = ChangeLogFieldType.Date },
new ChangeLog { Id = 10, EntityName = "Role",PropertyName = "RoleName",PrimaryKeyValue = 56,OldValue = "Admin",NewValue = "Administrator",DateChanged = DateTime.Now,FieldType = ChangeLogFieldType.Default },
};
var changelogs = MockDbSet(allTestData);
dbContext.Setup(m => m.Set<ChangeLog>()).Returns(() => changelogs);
repository = new ChangeLogRepository(dbContext.Object, 10);
}
[TestMethod]
public void Setup_Test()
{
Assert.AreEqual(repository.GetAll(), allTestData);
}
private static DbSet<T> MockDbSet<T>(IEnumerable<T> list) where T : class, new()
{
IQueryable<T> queryableList = list.AsQueryable();
Mock<DbSet<T>> dbSetMock = new Mock<DbSet<T>>();
dbSetMock.As<IQueryable<T>>().Setup(x => x.Provider).Returns(queryableList.Provider);
dbSetMock.As<IQueryable<T>>().Setup(x => x.Expression).Returns(queryableList.Expression);
dbSetMock.As<IQueryable<T>>().Setup(x => x.ElementType).Returns(queryableList.ElementType);
dbSetMock.As<IQueryable<T>>().Setup(x => x.GetEnumerator()).Returns(queryableList.GetEnumerator());
return dbSetMock.Object;
}
}
如果我运行它,测试就会失败,因为
getAll()
方法返回null。似乎被模拟的Set()
方法没有正确初始化属性“Entities”。当我在存储库构造函数中设置断点并检查“Expression > Value > Result View”下的Entities属性时,三个条目将显示出来。在第一个Result View下,有一条“Enumeration yielded no results”的消息和两行带问号的内容(Visual Studio 2017)。
如何正确地模拟存储库中的实体?我做错了什么?