Unable to load test resource immediately after clean

steps

1. Clone the demonstration repository
2. Run demo.sh

The output we’re seeing is in the README of the demonstration repository.

problem

The test in the demo tries to load a file from test resources using Thread.currentThread.getContextClassLoader:

• When the tests run immediately after a clean, the test fails because the resource can’t be found.
• In subsequent sbt executions, the tests pass.

expectation

Code in the test scope should always be able to load resources from src/test/resources, whether immediately after a clean or not.

notes

sbt version: 1.0.0 and 1.0.1

Running the demo script with build.properties setting sbt.version=0.13.16 works as expected.

[eed3si9n]

Based on Rafal’s analysis I am going to call it a Specs2 issue.

[ravwojdyla]

It seems like this is related to how specs2 works, reasoning:

• thread pool created by specs2 might not have valid ClassLoader in which case the tests will fail. I have not looked into code of specs2, but their ThreadPool most likely inherits ClassLoader from the parent thread, in which case it would depend on whatever is the state of the parent thread (which might explain why it sometimes works, and sometimes doesn’t)
• can’t reproduce this problem in scalatest, which uses the same thread as sbt to execute test code (which ensures that ContextClassLoader is valid for the duration of the test, here)