Moq Parent does not have a default constructor. The default constructor must be explicitly defined - asp.net

Question

I am using entity framework db first approach and generated edmx file.
I am trying to implement enter code here Unit testing with MOQ framework.
Here is my code
[TestMethod]
public void DeleteApplication()
{
var mockContext = new Mock<ARMSContext>();
var data = GetMemoryApplications();
var mockSet = new Mock<DbSet<Application>>();
mockSet.As<IQueryable<Application>>().Setup(m => m.Provider).Returns(data.Provider);
mockSet.As<IQueryable<Application>>().Setup(m => m.Expression).Returns(data.Expression);
mockSet.As<IQueryable<Application>>().Setup(m => m.ElementType).Returns(data.ElementType);
mockSet.As<IQueryable<Application>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());
var test=appcontroller.Delete(1, 1);
}
I am getting the Parent does not have.. exception while calling mockSet.Object.
could you pls to resolve this exception?

Answer 1

From what you have given, I can't see how you are using Mock<DbSet<Application>>, nor Mock<ARMSContext>.
Here is the sample given from MSDNs "Testing with a mocking framework (EF6 onwards)", which hooks the DbSet up to the Context:
[TestMethod]
public void GetAllBlogs_orders_by_name()
{
var data = new List<Blog>
{
new Blog { Name = "BBB" },
new Blog { Name = "ZZZ" },
new Blog { Name = "AAA" },
}.AsQueryable();
var mockSet = new Mock<DbSet<Blog>>();
mockSet.As<IQueryable<Blog>>().Setup(m => m.Provider).Returns(data.Provider);
mockSet.As<IQueryable<Blog>>().Setup(m => m.Expression).Returns(data.Expression);
mockSet.As<IQueryable<Blog>>().Setup(m => m.ElementType).Returns(data.ElementType);
mockSet.As<IQueryable<Blog>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());
var mockContext = new Mock<BloggingContext>();
mockContext.Setup(c => c.Blogs).Returns(mockSet.Object);
var service = new BlogService(mockContext.Object);
var blogs = service.GetAllBlogs();
Assert.AreEqual(3, blogs.Count);
Assert.AreEqual("AAA", blogs[0].Name);
Assert.AreEqual("BBB", blogs[1].Name);
Assert.AreEqual("ZZZ", blogs[2].Name);
}
}