SA's buildreplayjars command doesn't have any tests. The command is actually broken as the ClassWriter that the buildreplayjars command relies on does not generate the classfiles completely. Many of the attributes in the generated classfiles are missing which makes the jar files emitted out by buildreplayjars unusable.
Adding a test for buildreplayjars would prevent this command from rotting again.

The test would generate the boot and app jar files using buildreplayjars command and run the app again using the generated jar files.