1 files changed, 20 insertions, 0 deletions
diff --git a/railties/test/application/rake/multi_dbs_test.rb b/railties/test/application/rake/multi_dbs_test.rb
index d676e7486e..147b8f94e1 100644
--- a/railties/test/application/rake/multi_dbs_test.rb
+++ b/railties/test/application/rake/multi_dbs_test.rb
@@ -137,6 +137,21 @@ module ApplicationTests
         end
       end
 
+      def db_prepare
+        Dir.chdir(app_path) do
+          generate_models_for_animals
+          output = rails("db:prepare")
+
+          ActiveRecord::Base.configurations.configs_for(env_name: Rails.env).each do |db_config|
+            if db_config.spec_name == "primary"
+              assert_match(/CreateBooks: migrated/, output)
+            else
+              assert_match(/CreateDogs: migrated/, output)
+            end
+          end
+        end
+      end
+
       def write_models_for_animals
         # make a directory for the animals migration
         FileUtils.mkdir_p("#{app_path}/db/animals_migrate")
@@ -226,6 +241,11 @@ module ApplicationTests
         require "#{app_path}/config/environment"
         db_migrate_and_schema_cache_dump_and_schema_cache_clear
       end
+
+      test "db:prepare works on all databases" do
+        require "#{app_path}/config/environment"
+        db_prepare
+      end
     end
   end
 end