Are there any complications with

self.tool_classpath

and

cls.register_jvm_tool

in unit tests? They work fine in regular integration tests, but when I execute a task in a unit test, I get

TaskError: No bootstrap callback registered for spindle-codegen in a365abf6209343e4bb048da10f33290d

even though I put a corresponding Spindle codegen target in root BUILD using

self.add_to_build_file