diff --git a/tests/unit/test_f212_upgrade_convergence.py b/tests/unit/test_f212_upgrade_convergence.py
new file mode 100644
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+++ b/tests/unit/test_f212_upgrade_convergence.py
@@ -0,0 +1,76 @@
+"""Unit tests for the F2-12 owned upgrade-convergence wait (P7-negative / non-vacuousness).
+
+F2-12 fix: the upgrade chaos redeploy runs with `abra … -c` (skips abra's own convergence monitor),
+and the harness OWNS the verification via `lifecycle.wait_healthy` (services N/N + app HEALTH_PATH)
+then `lifecycle.wait_ready_probes` (recipe READY_PROBE, e.g. collabora WOPI discovery → 200). Skipping
+abra's monitor is only acceptable if the replacement genuinely FAILS a broken convergence rather than
+green-washing it (plan §7.1 / Adversary pre-claim recon 2026-05-29). These tests prove exactly that,
+deterministically (fake clock, no deploy):
+  - wait_ready_probes RAISES when the probe never returns an OK status (stuck service).
+  - wait_ready_probes RETURNS when the probe reaches OK (and is a no-op without a READY_PROBE).
+  - wait_healthy RAISES when services never converge, and when they converge but HTTP never serves OK.
+So `-c` + owned-wait is non-vacuous: a genuinely-broken upgrade stays RED.
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+
+import pytest
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
+from harness import lifecycle as lc  # noqa: E402
+
+
+def _fake_clock(monkeypatch):
+    """Install a fake monotonic clock on lifecycle.time so sleeps advance it without real waiting."""
+    state = {"t": 1000.0}
+    monkeypatch.setattr(lc.time, "time", lambda: state["t"])
+    monkeypatch.setattr(lc.time, "sleep", lambda s: state.__setitem__("t", state["t"] + s))
+    return state
+
+
+_DRIVE_META = {
+    "READY_PROBE": lambda d: [{"host": f"collabora-{d}", "path": "/hosting/discovery", "ok": (200,)}]
+}
+
+
+def test_wait_ready_probes_raises_when_never_ready(monkeypatch):
+    """A READY_PROBE that never returns 200 (collabora discovery wedged) must raise TimeoutError —
+    NOT silently pass. This is what makes `-c` + owned-wait catch a genuinely stuck upgrade."""
+    _fake_clock(monkeypatch)
+    monkeypatch.setattr(lc, "http_get", lambda host, path="/", timeout=15: 404)
+    with pytest.raises(TimeoutError):
+        lc.wait_ready_probes(_DRIVE_META, "lasu-x.ci.commoninternet.net", timeout=120)
+
+
+def test_wait_ready_probes_returns_when_ready(monkeypatch):
+    """When the probe reaches 200, it returns (no raise)."""
+    _fake_clock(monkeypatch)
+    monkeypatch.setattr(lc, "http_get", lambda host, path="/", timeout=15: 200)
+    lc.wait_ready_probes(_DRIVE_META, "lasu-x.ci.commoninternet.net", timeout=120)  # no raise
+
+
+def test_wait_ready_probes_noop_without_probe(monkeypatch):
+    """A recipe with no READY_PROBE is a clean no-op (default behavior preserved for all recipes)."""
+    monkeypatch.setattr(lc, "http_get", lambda *a, **k: 599)  # would fail if it were consulted
+    lc.wait_ready_probes({}, "x.ci.commoninternet.net", timeout=1)  # no raise, no call
+
+
+def test_wait_healthy_raises_when_services_never_converge(monkeypatch):
+    """If swarm services never reach N/N, wait_healthy must raise (the upgrade op then fails the tier)."""
+    _fake_clock(monkeypatch)
+    monkeypatch.setattr(lc, "services_converged", lambda domain: False)
+    monkeypatch.setattr(lc, "http_get", lambda *a, **k: 200)  # irrelevant; convergence gates first
+    with pytest.raises(TimeoutError):
+        lc.wait_healthy("x.ci.commoninternet.net", deploy_timeout=60, http_timeout=60)
+
+
+def test_wait_healthy_raises_when_converged_but_never_serves(monkeypatch):
+    """Services converged but the app never returns an OK status → wait_healthy raises (non-vacuous)."""
+    _fake_clock(monkeypatch)
+    monkeypatch.setattr(lc, "services_converged", lambda domain: True)
+    monkeypatch.setattr(lc, "http_get", lambda *a, **k: 502)
+    with pytest.raises(TimeoutError):
+        lc.wait_healthy("x.ci.commoninternet.net", ok_codes=(200,), deploy_timeout=60, http_timeout=60)