问题描述
我有一个用Moq进行单元测试的DbContext。 DbContext有两个依赖关系,我在主程序中通过Autofac注入了这些依赖关系。当我进行单元测试时,Moq告诉我找不到无参数的构造函数。我在DbContext中添加了无参数构造函数,并且单元测试通过了。有没有办法像我在主程序中那样用Autofac注入DbContext依赖项?
这是我的单元测试:
[TestMethod]
public void GetAllPersons_orders_by_name()
{
var data = new List<Person>
{
new Person { FirstName = "John",LastName = "Doe"},new Person { FirstName = "Bill",LastName = "Smith"},new Person { FirstName = "Fred",LastName = "Williams"}
}.AsQueryable();
var mockSet = new Mock<DbSet<Person>>();
mockSet.As<IQueryable<Person>>().Setup(m => m.Provider).Returns(data.Provider);
mockSet.As<IQueryable<Person>>().Setup(m => m.Expression).Returns(data.Expression);
mockSet.As<IQueryable<Person>>().Setup(m => m.ElementType).Returns(data.ElementType);
mockSet.As<IQueryable<Person>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());
var mockContext = new Mock<MyContext>();
mockContext.Setup(c => c.People).Returns(mockSet.Object);
var service = new PeopleService(mockContext.Object);
var people = service.GetAllPeople();
Assert.AreEqual(3,people.Count);
Assert.AreEqual("John",people[0].FirstName);
Assert.AreEqual("Bill",people[1].FirstName);
Assert.AreEqual("Fred",people[2].FirstName);
}
解决方法
您可以在创建模拟对象时添加构造函数args。因此,在这种情况下,它将是:
var mockContext = new Mock<MyContext>(myDependecy1,myDependency2 ...);