lean4-htt/tests/elab/promise.lean
Garmelon 08eb78a5b2
chore: switch to new test/bench suite (#12590)
This PR sets up the new integrated test/bench suite. It then migrates
all benchmarks and some related tests to the new suite. There's also
some documentation and some linting.

For now, a lot of the old tests are left alone so this PR doesn't become
even larger than it already is. Eventually, all tests should be migrated
to the new suite though so there isn't a confusing mix of two systems.
2026-02-25 13:51:53 +00:00

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import Std.Sync.Channel
open IO
-- not in the run/ directory because then it would be run with -j0
#eval do
let promise ← Promise.new
promise.resolve 42
assert! promise.result?.get = some 42
/- Dropping a promise resolves `result?` to `none`. -/
#eval do
let promise : Promise Nat ← Promise.new
assert! promise.result?.get = none
#eval show IO _ from do
let ch ← Std.CloseableChannel.new
let out ← IO.mkRef #[]
ch.sync.send 0
let drainFinished ← ch.forAsync fun x => out.modify (·.push x)
ch.sync.send 1
ch.close
assert! (← EIO.toBaseIO (ch.sync.send 2)) matches .error .closed
IO.wait drainFinished
assert! (← out.get) = #[0, 1]