refactor spec to match other spec style

spec/mobility/backends/active_record/container_spec.rb

@@ -21,17 +21,22 @@
     include_dup_examples 'ContainerPost'
     include_cache_key_examples 'ContainerPost'
 
-    it 'does not change translations on access' do
-      post = ContainerPost.new
-
-      expect { post.title }.not_to change { post.translations }.from({})
-    end
-
-    it 'does not mix up dirty tracking on access' do
-      post = ContainerPost.new
+    it 'does not change translations and dirty tracking' do
+      post = ContainerPost.create!
+
+      aggregate_failures "on access" do
+        expect { post.title }
+          .to not_change { post.translations }.from({})
+          .and not_change { post.changes }.from({})
+          .and not_change { post.changed? }.from(false)
+      end
 
-      expect { post.title }.not_to change { post.changes }.from({})
-      expect(post.changed?).to be(false)
+      aggregate_failures "on reload" do
+        expect { post.reload }
+          .to not_change { post.translations }.from({})
+          .and not_change { post.changes }.from({})
+          .and not_change { post.changed? }.from(false)
+      end
     end
   end
 

spec/support/matchers/not_change.rb

@@ -0,0 +1 @@
+RSpec::Matchers.define_negated_matcher :not_change, :change