From 6f508d574eca3d3133f4fd1945556673a3dbba96 Mon Sep 17 00:00:00 2001
From: Kit Langton <kit.langton@gmail.com>
Date: Wed, 29 Apr 2026 20:19:52 -0400
Subject: [PATCH] test: deflake runner cancel test (#25021)

---
 packages/opencode/test/effect/runner.test.ts | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/packages/opencode/test/effect/runner.test.ts b/packages/opencode/test/effect/runner.test.ts
index ee99050a8c..80870a234e 100644
--- a/packages/opencode/test/effect/runner.test.ts
+++ b/packages/opencode/test/effect/runner.test.ts
@@ -115,8 +115,16 @@ describe("Runner", () => {
     Effect.gen(function* () {
       const s = yield* Scope.Scope
       const runner = Runner.make<string>(s)
-      const fiber = yield* runner.ensureRunning(Effect.never.pipe(Effect.as("never"))).pipe(Effect.forkChild)
-      yield* Effect.sleep("10 millis")
+      const started = yield* Deferred.make<void>()
+      const fiber = yield* runner
+        .ensureRunning(
+          Effect.gen(function* () {
+            yield* Deferred.succeed(started, void 0)
+            return yield* Effect.never.pipe(Effect.as("never"))
+          }),
+        )
+        .pipe(Effect.forkChild)
+      yield* Deferred.await(started)
       expect(runner.busy).toBe(true)
       expect(runner.state._tag).toBe("Running")