[英]How do I go about unit testing with Entity Framework and Moq?
I'm new to Moq, and wanting to use it like a backing store for data - but without touching the live database. 我是Moq的新手,想要像数据的后备存储一样使用它 - 但是没有触及实时数据库。
My setup is as follows: 我的设置如下:
Here is my test so far: 这是我到目前为止的测试:
// 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());
My test seems to be successful, as it can verify that a user was added to the mock DbSet - but what I need to do is actually get that data back and perform further assertions on it (this is just an ad-hoc test). 我的测试似乎是成功的,因为它可以验证用户是否已添加到模拟DbSet中 - 但我需要做的是实际获取该数据并对其执行进一步的断言(这只是一个临时测试)。
Please advise, testing frameworks are doing my head in. Also, I have the option to move to other testing frameworks if they are easier to use. 请指教,测试框架正在努力。另外,如果它们更容易使用,我可以选择转移到其他测试框架。
Thank you. 谢谢。
Update: Here is my working code. 更新:这是我的工作代码。
Unit Test 单元测试
// 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 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().
}
}
You just need to create a collection to act as the backing store and mock the enumeration db set with the backing collection 您只需创建一个集合作为后备存储,并使用后备集合模拟枚举数据库集
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
}
}
So now you can use a list to hold the data 所以现在您可以使用列表来保存数据
// 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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