Mocking OData service endpoint - unit-testing

Question

I am trying to mock the OData service context using Moq to return a list of dummy entities so that I could base my unit test on that. I cannot expose my real model and application so I have created this simulated app and the portion, which I have exposed is similar.
MyOdataApplication consuming ODataEndpoint which I am testing.
public class MyApplication
{
private readonly IODataContext _odataContext;
public MyApplication(IODataContext odataContext){
_odataContext = odataContext;
}
public async Task<IEnumerable<Book>> GetBooks(string authorName)
{
IEnumerable<Book> books = null;
var query = (DataServiceQuery<Book>)_odataContext.Books.Where(x => x.Author = authorName);
books = await query.ExecuteAsync().ToList();
return books;
}
public bool async ValidateBooks(string authorName){
var books = await GetBooks(authorname);
//other code....
}
}
My Odata Service contract interface is
public interface IODataContext
{
global::Microsoft.OData.Client.DataServiceQuery<global::models.Book> Books { get; }
}
My Unit Test class is as follows.
[TestFixture]
public class MyTestClass
{
[Test]
public void TestOdataFunctionality()
{
var mockODataEndpoint = new Mock<IODataContext>();
//It fails here as its not able to convery IQueryable<Book> to DataServiceQuery<Book>
mockODataEndpoint.Setup(x => x.GetBooks(It.IsAny<string>)).Returns(GetDummyBooks());
var myApp = new MyApplication(mockODataEndpoint.Object);
//This is my main method which I need to test.
Task<bool> task = myApp.ValidateBooks("author name");
var isvalid = task.Result;
Assert.AreEqual(true, isvalid);
}
private DataServiceQuery<Book>GetDummyBooks()
{
var books = new List<Book>
{
new Book()
{
Name = "Book1",
Author = "author name",
//other properties...
}
};
//Not sure how to achieve this. The below line is giving error ???
return (DataServiceQuery<Book>)books.AsQueryable();
}
}
How do I mock the Odata Service endpoint so that I could test my ValidateBooks method?