[1.6.x] Throw when test framework cannot be loaded due to MatchError or NoClassDefFoundError #6806
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…ssDefFoundError Problem ------- In some situations like Dotty Community Build, sbt version is mechanically upgraded on an old commit without humans checking the log. For reasons we're not completely sure (likely change in ClassLoader structure) sbt 1.6.x started to fail to load test frameworks during tests, but since the failure of the test framework loading doesn't fail the task, this silently succeeded the builds. Solution -------- On MatchError and NoClassDefFound Error, rethrow the exception. Note that ClassNotFoundException is considered ok since we have predefined test frameworks listed in sbt, which often are not included in the users' classpath.
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Fixes #6805
Ref scala/scala3#14391
Ref #6480
Problem
In some situations like Dotty Community Build, sbt version is
mechanically upgraded on an old commit without humans checking the log.
For reasons we're not completely sure (likely change in ClassLoader
structure) sbt 1.6.x started to fail to load test frameworks during
tests, but since the failure of the test framework loading doesn't fail
the task, this silently succeeded the builds.
Solution
On MatchError and NoClassDefFound Error, rethrow the exception.
Note that ClassNotFoundException is considered ok since we have
predefined test frameworks listed in sbt, which often are not included
in the users' classpath.