[英]Why is my mocked object returning no results?
我试图创建一个DBContext
和DbSet
的模拟。 我想,我设置DBContext
正确了,反过来, DbSet
但即使我添加元素的DBSet
,它仍然返回null。
我做错了什么吗?
首先,我进行如下设置:
[SetUp]
public void Setup_Tests()
{
Database.SetInitializer(new DropCreateDatabaseAlways<SubscriptionManagementContext>());
var mock = new Mock<SubscriptionManagementContext>();
mock.Setup(xx => xx.UIElements).Returns(GetMockDBSet(SubManInitializer.GetUIElements));
_subscriptionManagementContext = mock.Object;
}
SubscriptionManagementContext
定义为:
public class SubscriptionManagementContext : DbContext
{
public SubscriptionManagementContext()
: base("SubscriptionManagementContext")
{
}
public virtual DbSet<UIElement> UIElements { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
}
在这里, setupAction.Invoke()
应该返回GetUIElements()
定义的List<UIElement>
private static DbSet<T> GetMockDBSet<T>(Func<List<T>> setupAction) where T : class
{
var mockDBSet = new Mock<DbSet<T>>();
mockDBSet.Setup(xx => xx.AddRange(setupAction.Invoke()));
return mockDBSet.Object;
}
public static List<UIElement> GetUIElements()
{
var uiElements = new List<UIElement>
{
new UIElement {ElementName = "EmailDetails" },
new UIElement {ElementName = "SFTPDetails" },
new UIElement {ElementName = "ScheduleDetails" },
new UIElement {ElementName = "FileNameElement" },
};
return uiElements;
}
当我调试该测试时,我可以看到GetUIElements()
已执行,因此我认为uiElements
对象可以包含数据,但它抛出ArgumentNullException
。
[Test]
public void Can_Get_UIElements()
{
var uiElements = _subscriptionManagementContext.UIElements;
Assert.IsNotNull(uiElements);
Assert.IsTrue(uiElements.Any()); // throws System.ArgumentNullException
}
我需要做什么以确保uiElements
包含数据?
编辑
根据要求,堆栈跟踪:
at System.Linq.Expressions.Expression.RequiresCanRead(Expression expression, String paramName)
at System.Linq.Expressions.Expression.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arg, ParameterInfo pi)
at System.Linq.Expressions.Expression.ValidateArgumentTypes(MethodBase method, ExpressionType nodeKind, ReadOnlyCollection`1& arguments)
at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, IEnumerable`1 arguments)
at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, Expression[] arguments)
at System.Linq.Queryable.Any[TSource](IQueryable`1 source)
at tstReportSubscriptionManagement.Test.SubManTests.Can_Get_UIElements() in c:\git\tst\tstReportSubscriptionMgmt\tstReportSubscriptionManagement.Test\SubManTests.cs:line 74
由于DbSet
用于处理IQueryable<T>
数据,因此AddRange
不足以使其像常规List<T>
。
您需要模拟IQueryable<T>
缺少的实现:
private static DbSet<T> GetMockDBSet<T>(Func<List<T>> setupAction) where T : class
{
var mockDBSet = new Mock<DbSet<T>>();
var mockedData = setupAction.Invoke().AsQueryable();
mockDBSet.As<IQueryable<T>>().Setup(x => x.Provider).Returns(mockedData.Provider);
mockDBSet.As<IQueryable<T>>().Setup(x => x.Expression).Returns(mockedData.Expression);
mockDBSet.As<IQueryable<T>>().Setup(x => x.ElementType).Returns(mockedData.ElementType);
mockDBSet.As<IQueryable<T>>().Setup(x => x.GetEnumerator()).Returns(mockedData.GetEnumerator());
return mockDBSet.Object;
}
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