How to mock a private readonly IList<T> property using moq
c#, moq, nbuilder
Solution
Well, I think it's odd and frankly wrong to mock a private implementation detail. Your tests shouldn't depend on private implementation details.
But the way that I'd do this if I were you is to add a constructor:
public Foo {
private readonly IList<MyClass> myList;
public Foo(IList<MyClass> myList) { this.myList = myList; }
}
and then use Moq to mock an instance of `IList<MyClass>` and pass that through the constructor.
If you don't like that suggestion, alternatively, make a virtual property:
public Foo {
private readonly IList<MyClass> myList = new MyList();
public virtual IList<MyClass> MyList { get { return this.myList; } }
}
and then use Moq to override that property.
Still, you're doing it wrong.
Problem
I'm trying to mock this list: ``` private readonly IList<MyClass> myList = new List<MyClass>(); ``` using this (as seen here): ``` IList<MyClass> mockList = Builder<MyClass>.CreateListOfSize(5).Build(); mockObj.SetupGet<IEnumerable<MyClass>>(o => o.myList).Returns(stakeHoldersList); ``` However at runtime I get an InvalidCastException: ``` Unable to cast object of type 'System.Collections.Generic.List`1[MyClass]' to type 'System.Collections.ObjectModel.ReadOnlyCollection`1[MyClass]'. ``` What am I doing wrong?