C# 为什么我的模拟对象没有返回结果?
我正在尝试创建一个模拟C# 为什么我的模拟对象没有返回结果?,c#,entity-framework,unit-testing,moq,C#,Entity Framework,Unit Testing,Moq,我正在尝试创建一个模拟DBContext和DbSet。我认为我正确地设置了DBContext,反过来,设置了DbSet,但即使我向DbSet添加了元素,它仍然返回null 我是不是做错了什么 首先,我按如下方式进行设置: [SetUp] public void Setup_Tests() { Database.SetInitializer(new DropCreateDatabaseAlways<SubscriptionManagementContext>());
DBContext
和DbSet
。我认为我正确地设置了DBContext
,反过来,设置了DbSet
,但即使我向DbSet
添加了元素,它仍然返回null
我是不是做错了什么
首先,我按如下方式进行设置:
[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;
}
此处setupAction.Invoke()
应返回GetUIElements()中定义的列表
我需要做什么来确保ui元素
将包含数据
编辑
根据请求,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
由于模拟的DbSet
旨在处理IQueryable
数据,AddRange
不足以使其像常规的列表一样工作
您需要模拟缺少的IQueryable的实现:
private static DbSet GetMockDBSet(Func setupAction),其中T:class
{
var mockDBSet=new Mock();
var mockedData=setupAction.Invoke().AsQueryable();
mockDBSet.As().Setup(x=>x.Provider).返回(mockedData.Provider);
mockDBSet.As().Setup(x=>x.Expression).Returns(mockedData.Expression);
mockDBSet.As().Setup(x=>x.ElementType).Returns(mockedData.ElementType);
mockDBSet.As().Setup(x=>x.GetEnumerator()).Returns(mockedData.GetEnumerator());
返回mockDBSet.Object;
}
显示堆栈跟踪我已经用堆栈跟踪更新了问题。没有内在的例外。
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;
}
[Test]
public void Can_Get_UIElements()
{
var uiElements = _subscriptionManagementContext.UIElements;
Assert.IsNotNull(uiElements);
Assert.IsTrue(uiElements.Any()); // throws System.ArgumentNullException
}
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
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;
}