inheritance-spec.diff

diff --git a/elasticsearch-persistence/spec/repository/base_spec.rb b/elasticsearch-persistence/spec/repository/base_spec.rb
index fae1e7b..4a1fc4f 100644
--- a/elasticsearch-persistence/spec/repository/base_spec.rb
+++ b/elasticsearch-persistence/spec/repository/base_spec.rb
@@ -321,4 +321,22 @@ describe Elasticsearch::Persistence::Repository::Base do
 
     it_behaves_like 'a base repository'
   end
+
+  context 'when configuration changes on a descendant' do
+    let(:repository) { MyRepository }
+    let!(:old_class) { repository.superclass.klass }
+    let(:new_class) { Object }
+
+    before do
+      repository.klass = new_class
+    end
+
+    it 'applies to the descendant only' do
+      expect(repository.klass).to be(new_class)
+    end
+
+    it 'does not apply to the base class' do
+      expect(repository.superclass.klass).to be(old_class)
+    end
+  end
 end