[英]How do I go about unit testing with Entity Framework and Moq?
我是Moq的新手,想要像數據的后備存儲一樣使用它 - 但是沒有觸及實時數據庫。
我的設置如下:
這是我到目前為止的測試:
// ARRANGE
var user = new User()
{
FirstName = "Some",
LastName = "Guy",
EmailAddress = "some.guy@mockymoqmoq.com",
};
var mockSet = new MockDbSet<User>();
var mockContext = new Mock<WebAPIDbContext>();
mockContext.Setup(c => c.Set<User>()).Returns(mockSet.Object);
// ACT
using (var uow = UnitOfWork.Create(mockContext.Object))
{
uow.UserRepository.Add(user);
uow.SaveChanges();
}
// ASSERT
mockSet.Verify(u => u.Add(It.IsAny<User>()), Times.Once());
我的測試似乎是成功的,因為它可以驗證用戶是否已添加到模擬DbSet中 - 但我需要做的是實際獲取該數據並對其執行進一步的斷言(這只是一個臨時測試)。
請指教,測試框架正在努力。另外,如果它們更容易使用,我可以選擇轉移到其他測試框架。
謝謝。
更新:這是我的工作代碼。
單元測試
// ARRANGE
var user = new User()
{
FirstName = "Some",
LastName = "Guy",
EmailAddress = "some.guy@mockymoqmoq.com",
};
var mockSet = new MockDbSet<User>();
var mockContext = new Mock<WebAPIDbContext>();
mockContext.Setup(c => c.Set<User>()).Returns(mockSet.Object);
// ACT
using (var uow = UnitOfWork.Create(mockContext.Object))
{
uow.UserRepository.Add(user);
uow.SaveChanges();
}
// ASSERT
mockSet.Verify(u => u.Add(It.IsAny<User>()), Times.Once());
// TODO: Further assertations can now take place by accessing mockSet.BackingStore.
}
MockDbSet
class MockDbSet<TEntity> : Mock<DbSet<TEntity>> where TEntity : class
{
public ICollection<TEntity> BackingStore { get; set; }
public MockDbSet()
{
var queryable = (this.BackingStore ?? (this.BackingStore = new List<TEntity>())).AsQueryable();
this.As<IQueryable<TEntity>>().Setup(e => e.Provider).Returns(queryable.Provider);
this.As<IQueryable<TEntity>>().Setup(e => e.Expression).Returns(queryable.Expression);
this.As<IQueryable<TEntity>>().Setup(e => e.ElementType).Returns(queryable.ElementType);
this.As<IQueryable<TEntity>>().Setup(e => e.GetEnumerator()).Returns(() => queryable.GetEnumerator());
// Mock the insertion of entities
this.Setup(e => e.Add(It.IsAny<TEntity>())).Returns((TEntity entity) =>
{
this.BackingStore.Add(entity);
return entity;
});
// TODO: Other DbSet members can be mocked, such as Remove().
}
}
您只需創建一個集合作為后備存儲,並使用后備集合模擬枚舉數據庫集
public class MockDbSet<TEntity> : Mock<DbSet<TEntity>> where TEntity : class {
public MockDbSet(List<TEntity> dataSource = null) {
var data = (dataSource ?? new List<TEntity>());
var queryable = data.AsQueryable();
this.As<IQueryable<TEntity>>().Setup(e => e.Provider).Returns(queryable.Provider);
this.As<IQueryable<TEntity>>().Setup(e => e.Expression).Returns(queryable.Expression);
this.As<IQueryable<TEntity>>().Setup(e => e.ElementType).Returns(queryable.ElementType);
this.As<IQueryable<TEntity>>().Setup(e => e.GetEnumerator()).Returns(() => queryable.GetEnumerator());
//Mocking the insertion of entities
this.Setup(_ => _.Add(It.IsAny<TEntity>())).Returns((TEntity arg) => {
data.Add(arg);
return arg;
});
//...the same can be done for other members like Remove
}
}
所以現在您可以使用列表來保存數據
// ARRANGE
var dataSource = new List<User>(); //<-- this will hold data
var user = new User()
{
FirstName = "Some",
LastName = "Guy",
EmailAddress = "some.guy@mockymoqmoq.com",
};
var mockSet = new MockDbSet<User>(dataSource);
var mockContext = new Mock<WebAPIDbContext>();
mockContext.Setup(c => c.Set<User>()).Returns(mockSet.Object);
// ACT
using (var uow = UnitOfWork.Create(mockContext.Object))
{
uow.UserRepository.Add(user);
uow.SaveChanges();
// ASSERT
mockSet.Verify(u => u.Add(It.IsAny<User>()), Times.Once());
Assert.IsTrue(dataSource.Contains(user)); //<-- shows mock actually added item
Assert.IsTrue(uow.UserRepository.Any(u => u == user)); //<-- show you can actually query mock DbSet
}
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