I'm looking to customize the creation-time behavior of AutoFixture such that I can set up some dependent objects after the properties of the fixture have been generated and assigned.
For example, suppose I have a method that customizes a User
because its IsDeleted
property always has to be false for a certain set of tests:
public class User
{
public int Id { get; set; }
public string Name { get; set; }
public bool IsDeleted { get; set; }
}
public static ObjectBuilder<User> BuildUser(this Fixture f)
{
return f.Build<User>().With(u => u.IsDeleted, false);
}
(I hand an ObjectBuilder
back to the test so it can further customize the fixture if necessary.)
What I'd like to do is automatically associate that user with an anonymous collection by its Id
at creation time, but I can't do this as-is because Id
has not been generated by the time I hand the return value back to the unit test proper. Here's the sort of thing I'm trying to do:
public static ObjectBuilder<User> BuildUserIn(this Fixture f, UserCollection uc)
{
return f.Build<User>()
.With(u => u.IsDeleted, false);
.AfterCreation(u =>
{
var relation = f.Build<UserCollectionMembership>()
.With(ucm => ucm.UserCollectionId, uc.Id)
.With(ucm => ucm.UserId, u.Id)
.CreateAnonymous();
Repository.Install(relation);
}
}
Is something like this possible? Or perhaps there is a better way to accomplish my goal of creating an anonymous object graph?
See Question&Answers more detail:os