- In the Rails mountable engine project, open Rails run/debug configuration for editing. By default, Rails run/debug configuration
is marked with the icon
. - In the Configuration tab, find the field Dummy app, which
is enabled for Rails mountable engine projects. Click
. Then, in the Select Working Directory
dialog box, locate the directory test/dummy in your project structure, and click OK.
Alternatively, you can type the fully qualified path to the test/dummy directory manually.
In the other fields, specify the Rails server, and the other necessary settings. or accept defaults.

The icon of the Rails run/debug configuration changes to
.
- Apply changes and close the dialog box.
- On the main toolbar, click
. The Rails server starts as described in the section Running Rails Server.

