After - GetTodosQueryTests.cs

[Collection("QueryTests")]
public class GetTodosQueryTests {
 private readonly ApplicationDbContext _context;
 private readonly IMapper _mapper;

 public GetTodosQueryTests(QueryTestFixture fixture) {
  _mapper = fixture.Mapper;
 }

 [Fact]
 public async Task Handle_ReturnsCorrectVmAndListCount() {
  //arrange
  var query = new GetTodosQuery();
  var mockedDbContext = new Mock < IApplicationDbContext > ();

  var todoListEntities = new List < TodoList > {
   new TodoList {
    Colour = "Blue", Items = new List < TodoItem > {
     new TodoItem {
      Title = "Dynamics"
     },
     new TodoItem {
      Title = "Case"
     },
     new TodoItem {
      Title = "Management"
     },
     new TodoItem {
      Title = "Accelerator"
     },
     new TodoItem {
      Title = "HSD"
     }
    }
   }
  };

  var mockDbSet = todoListEntities.AsQueryable().BuildMockDbSet();

  mockedDbContext.Setup(db => db.TodoLists).Returns(mockDbSet.Object);

  //act
  var handler = new GetTodosQuery.GetTodosQueryHandler(mockedDbContext.Object, _mapper);

  var result = await handler.Handle(query, CancellationToken.None);

  //assert
  result.ShouldBeOfType < TodosVm > ();
  result.Lists.Count.ShouldBe(1);

  var list = result.Lists.First();

  list.Items.Count.ShouldBe(5);
 }
}