Precompile Script [extras] for Apps

Can one build an app of a package which has an [extras] section? Meaning, I have a test script for my package/app which uses external dependencies (i.e. Test, ReferenceTests.jl, etc) that I would like to use for the precompile script.

For my current project, I get an error that "ReferenceTests is not found in the current path", but I've added this dependency to the [extras] section with the [targets] test = ["Test", "ReferenceTests", etc..]. Should this work for precompile scripts when building apps?

Start by reproducing an app build whose precompile script imports a dependency declared under [extras] and [targets]. Trace how PackageCompiler handles those dependencies during precompilation; done means the expected behavior is established and the failure is covered by a regression test or the issue is documented as unsupported.

Written by the indexing model from the issue text.