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@@ -82,6 +82,14 @@ To use the Amazon S3 service in production, you add the following to
config.active_storage.service = :amazon
```
+To use the test service when testing, you add the following to
+`config/environments/test.rb`:
+
+```ruby
+# Store uploaded files on the local file system in a temporary directory.
+config.active_storage.service = :test
+```
+
Continue reading for more information on the built-in service adapters (e.g.
`Disk` and `S3`) and the configuration they require.