Minimal reader interface for a data access layer

Garbage.cs

namespace Garbage 
{
  public class Garbage 
  {
    public int GarbageId { get; set; }
    public string Name { get; set; }
    public GarbageType Type { get; set; }
  }

  public enum GarbageType 
  {
    Cardboard,
    Plastic,
    Glass,
    Code
  }
}

IRead.cs

using System;

public interface IRead<T> 
{
  U Read<U>(Func<IQueryable<T,U>> queryFunction);
}

Read.cs

using Microsoft.EntityFrameworkCore;
using System;

public class Read<T> : IRead<T> 
{  
  private readonly DbContext _dbContext;
  
  public Read(DbContext dbContext) 
  {
    _dbContext = dbContext;
  }
  
  public U Read<U>(Func<IQueryable<T,U>> queryFunction) 
  {
    var set = _dbContext.Set<T>();
    return queryFunction(set);
  }
}

ReadTest.cs

using AutoFac.Extras.Moq;
using XUnit;
using Moq;

public namespace Tests 
{
  public class ReadTest 
  {
    [Fact]
    public void Read_IsSimpleAndMockable() 
    {
      using var am = AutoMock.GetLoose();
      var mock = am.Mock<IRead<Garbage>>();
      
      // abstract away all queryable functions as we only care about the return type to close the loop.
      mock.Setup(x => x.Read(It.IsAny<Func<IQueryable<Garbage>, Task<int>>>()))
        .ReturnsAsync(10);
    }
  }
}