run.test.ts's afterEach kills openidea-server and removes its home
directory, but a language server's own process (jdtls's JVM) outlives
the server and keeps writing .metadata underneath it, so the removal
races its writes (ENOTEMPTY). Retries only narrow the window: three
occurrences after the retry bump prove the JVM can linger past them.
The server now spawns detached (its own process group, which its
children inherit), and close() reaps the whole group after the server
exits (SIGKILL + gone-poll on POSIX, taskkill /T /F on Windows), so
the directory removal can't race anyone. debug.test.ts's teardown now
awaits close() too.
Language servers and debug adapters still write into the fixture's
temp dir as the test's afterEach tears it down, so a bare rmSync raced
them and failed the suite on ENOTEMPTY (Language smoke kotlin, java).
Give the removal maxRetries + retryDelay so a few late writes can't
flake the job.
Debugs each language's fixture the way the editor does, against openidea-server and the debugger the IDE installs: a breakpoint on the entry point's marker line, Debug from the file's context, then the paused frame, its variables, Evaluate Expression, Step Over and Resume. Runs per language in the Language smoke workflow. The build model is loaded first, as the Build Tools feature does, so a Gradle Application is debugged through Gradle; Step Over allows a repeated stop on a line (Python 3.12 reports a conditional expression's line twice).