Fixed the namespace of the BasePreventWritesLegacyTest class (#911)

Co-authored-by: Aidan Haran <aharan@fusioneer.com>

Author: aidanharan

test/cases/coerced_tests.rb

@@ -1760,18 +1760,20 @@ class BasePreventWritesTest < ActiveRecord::TestCase
       end
     end
   end
-end
 
-class BasePreventWritesLegacyTest < ActiveRecord::TestCase
-  # SQL Server does not have query for release_savepoint
-  coerce_tests! %r{an empty transaction does not raise if preventing writes}
-  test "an empty transaction does not raise if preventing writes coerced" do
-    ActiveRecord::Base.connection_handler.while_preventing_writes do
-      assert_queries(1, ignore_none: true) do
-        Bird.transaction do
-          ActiveRecord::Base.connection.materialize_transactions
+  class BasePreventWritesLegacyTest < ActiveRecord::TestCase
+    # SQL Server does not have query for release_savepoint
+    coerce_tests! %r{an empty transaction does not raise if preventing writes}
+    test "an empty transaction does not raise if preventing writes coerced" do
+      ActiveRecord::Base.connection_handler.while_preventing_writes do
+        assert_queries(1, ignore_none: true) do
+          Bird.transaction do
+            ActiveRecord::Base.connection.materialize_transactions
+          end
         end
       end
     end
   end
 end
+
+