{
  "slug": "createtestharness-can-evict-running-durable-objects-dd8ee20330fe",
  "title": "createTestHarness can evict running Durable Objects",
  "tools": [
    "wrangler"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-07-15T06:25:38.000Z",
  "announced_at": "2026-07-15T06:25:38.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When testing recovery after a running Durable Object is torn down, call `worker.evictDurableObject(classNameOrBindingName, { name })` from a Wrangler test harness. It preserves durable storage and resets in-memory state on the next start.",
    "examples": [
      "const worker = server.getWorker();\nawait worker.evictDurableObject(\"Counter\", { name: \"user-123\" });"
    ],
    "gotchas": [
      "Version: 4.111.0",
      "classNameOrBindingName (required): Exported Durable Object class name or binding name; class names resolve first.",
      "options.name (required): Instance name; provide this or `id`.",
      "options.id (required): Instance ID; provide this or `name`, but not both.",
      "options.webSockets: Choose `\"close\"` or `\"hibernate\"` for WebSockets.",
      "Prerequisite: Use Wrangler 4.111.0 or later; the release adds Durable Object eviction support to `createTestHarness`.",
      "Prerequisite: Harness setup requires a Worker project with Wrangler configuration, a Node.js test runner, and Wrangler installed as a development dependency."
    ]
  },
  "why_it_matters": "Test how a running Durable Object recovers after its instance is torn down.",
  "before": "The release note says this release adds Durable Object eviction support to `createTestHarness`; it does not specify an earlier workaround.",
  "sources": [
    "https://github.com/cloudflare/workers-sdk/releases/tag/wrangler%404.111.0",
    "https://github.com/cloudflare/workers-sdk/blob/wrangler%404.111.0/packages/wrangler/src/api/test-harness.ts",
    "https://developers.cloudflare.com/workers/testing/test-harness/get-started/"
  ],
  "rank": 0.96016,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v1+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "backfill-20261007",
    "verdict_id": "backfill-20261007:backfill-20261007-dcf1e05e1030a176-0:gate",
    "evidence_hash": "103a21b39ac5af53b6e585b5366f03a9e6ffd242c625fdded9f615bed1efd220"
  },
  "review": {
    "draft_hash": "12f4f65b8517449e21f4e9ce0fb3f5201a40e90c065bb8202e148449893e2666",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "backfill-20261007:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.96 >= 0.9; 2 needed) and Jev gave 0.74 (>= 0.6 needed)."
  }
}