I am trying write unit test for my DAL layer.
The complication is that the DAL Layer has a query which uses Include().
I don't know how to mock the Include() method.
Models
public class Apps
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[DataMember]
public int ID { get; set; }
[DataMember]
[Required(ErrorMessage = "App name required.")]
public string Name { get; set; }
public virtual ICollection<AppDataPermission> AppDataPermissions { get; set; }
}
public class AppDataPermission{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[DataMember]
public int ID { get; set; }
public DataPermissions DataPermission { get; set; }
public virtual Apps App { get; set; }
}
public enum DataPermissions
{
Admin = 1,
Support = 2
}
DAL
public List<Apps> GetApps()
{
var apps = dbContext.Apps
.Include(x => x.AppDataPermission)
.ToList();
return apps;
}
I tried following [ https://msdn.microsoft.com/en-us/library/dn314429(v=vs.113).aspx][1]
But I get following error
System.ArgumentNullException occurred
HResult=0x80004003
Message=Value cannot be null.
Parameter name: source
Source=EntityFramework
StackTrace:
at System.Data.Entity.Utilities.Check.NotNull[T](T value, String parameterName)
at System.Data.Entity.QueryableExtensions.Include[T,TProperty](IQueryable`1 source, Expression`1 path)
The problem with mocking the database access code is that the you are mocking the part that is the most complicated (linq-to-sql, navigation properties). I recommend, generally speaking, not to expose DAL objects.
Anyway, you haven't shown your mocking code, but I'm assuming that you are mocking public List<Apps> GetApps()
.
Here is one method to mock it:
var mockRepo = new Mock<IMyAmazingRepository>(MockBehavior.Strict);
var myMockedApps = new List<App> () {
new Apps { ID = 1, Name ="One", new List<AppDataPermission> { (...) },
new Apps { ID = 2, Name ="Two", new List<AppDataPermission> { (...) }
};
mockRepo.Setup(m => m.GetApps(_loggedInUserId)).Returns(myMockedApps);
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