Fix ORM adapter spec subjects

Author: pboling

CHANGELOG.md

@@ -28,6 +28,8 @@ Please file a bug if you notice a violation of semantic versioning.
 
 ### Fixed
 
+- Updated ORM adapter specs to exercise concrete ActiveRecord and Mongoid model classes.
+
 ### Security
 
 ## [3.1.5] - 2025-10-13

spec/omniauth/identity/models/active_record_spec.rb

@@ -14,7 +14,7 @@ class TestIdentity < OmniAuth::Identity::Models::ActiveRecord; end
 
 RSpec.describe(OmniAuth::Identity::Models::ActiveRecord, :sqlite3) do
   describe "model", type: :model do
-    let(:model_klass) do
+    subject(:model_klass) do
       AnonymousActiveRecord.generate(
         parent_klass: "OmniAuth::Identity::Models::ActiveRecord",
         columns: OmniAuth::Identity::Model::SCHEMA_ATTRIBUTES | %w[provider password_digest],

spec/omniauth/identity/models/mongoid_spec.rb

@@ -13,7 +13,7 @@
 
 RSpec.describe(OmniAuth::Identity::Models::Mongoid, :mongodb) do
   describe "model", type: :model do
-    let(:model_klass) { MongoidTestIdentity }
+    subject(:model_klass) { MongoidTestIdentity }
 
     it { is_expected.to(be_mongoid_document) }