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…auncherTest The ALL_SOURCE classpath assertion failed once in CI (INRIA#6890) with an empty classpath and passed on rerun. An empty classpath means a spoon.classpath*.tmp file existed but was empty; since cached files younger than 1h are reused without invoking Maven, a stale empty file (copied from the working directory along with the project) is the prime suspect. On failure, report path, size, mtime and content of the cached classpath files in both the copied project and the working directory. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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`MavenLauncherTest.spoonMavenLauncherTest` failed once in #6890 (`expected: not equal but was: <0>` on the ALL_SOURCE classpath) and passed on rerun.
An empty classpath means a `spoon.classpath*.tmp` file existed but was empty (a missing file throws instead). Cached files younger than 1h are reused without invoking Maven, and the test copies the whole working directory, including its cached files, into `spooned/`. A stale empty file is the prime suspect: planting an empty `spoon.classpath.tmp` at the repo root reproduces the exact failure locally.
This PR only adds a failure message listing path, size, mtime and content of the cached classpath files in both the copied project and the working directory, so the next occurrence tells us where the empty file came from.
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