[英]Why is my mocked object returning no results?
我試圖創建一個DBContext
和DbSet
的模擬。 我想,我設置DBContext
正確了,反過來, DbSet
但即使我添加元素的DBSet
,它仍然返回null。
我做錯了什么嗎?
首先,我進行如下設置:
[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
定義為:
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>();
}
}
在這里, setupAction.Invoke()
應該返回GetUIElements()
定義的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;
}
當我調試該測試時,我可以看到GetUIElements()
已執行,因此我認為uiElements
對象可以包含數據,但它拋出ArgumentNullException
。
[Test]
public void Can_Get_UIElements()
{
var uiElements = _subscriptionManagementContext.UIElements;
Assert.IsNotNull(uiElements);
Assert.IsTrue(uiElements.Any()); // throws System.ArgumentNullException
}
我需要做什么以確保uiElements
包含數據?
編輯
根據要求,堆棧跟蹤:
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
由於DbSet
用於處理IQueryable<T>
數據,因此AddRange
不足以使其像常規List<T>
。
您需要模擬IQueryable<T>
缺少的實現:
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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