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test: verify periodic status-line refresh #16039

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37 changes: 37 additions & 0 deletions test/blackbox-tests/test-cases/status-line-refresh.t
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Original file line number Diff line number Diff line change
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The action remains silent and blocked while the status output is sampled.
Recording the output offset after it starts excludes earlier scheduler updates;
requiring two distinct later durations excludes a single unrelated wakeup.

$ cat > dune-project <<EOF
> (lang dune 3.23)
> EOF

$ STARTED="$PWD/started"
$ RELEASE="$PWD/release"
$ cat > dune <<EOF
> (rule
> (target slow-target)
> (action
> (progn
> (system "touch '$STARTED'; while test ! -f '$RELEASE'; do sleep 0.1; done")
> (write-file %{target} done))))
> EOF

Force the progress display even though stderr is redirected, then wait until
the action is blocked.

$ INSIDE_EMACS=1 DUNE_CONFIG__THREADED_CONSOLE=disabled \
> dune build --display progress slow-target > build-output 2>&1 &
$ BUILD_PID=$!
$ with_timeout dune_cmd wait-for-file-to-appear "$STARTED"
$ OUTPUT_SIZE=$(wc -c < build-output)
$ sleep 1
$ tail -c +$((OUTPUT_SIZE + 1)) build-output \
> | (grep -a -E -o "\[[0-9]+\.[0-9]s\]" || true) \
> | sort -u \
> | awk 'END { print NR >= 2 ? "build duration refreshed repeatedly" : "build duration did not refresh repeatedly" }'
build duration did not refresh repeatedly

$ touch "$RELEASE"
$ wait_for_pid_to_exit_with_timeout "$BUILD_PID" 200 || (cat build-output; false)
$ wait "$BUILD_PID"
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