fix(tests): restrict On Hold/Resume to whichever team currently owns the test

canHold checked role OR role instead of matching the current phase, so
a red_tech still saw (and could call) Hold/Resume on a test already
sitting in blue_evaluating. Fixed on both frontend and backend — the
API had the same gap, not just the button visibility.

backend/app/routers/tests.py

@@ -1310,6 +1310,21 @@ def assign_test_operators(
 # ---------------------------------------------------------------------------
 
 
+def _check_hold_permission(current_user: User, test) -> None:
+    """Only whichever team currently owns the test may hold/resume it.
+
+    ``require_any_role_strict("red_tech", "blue_tech")`` alone lets either
+    role through regardless of phase — a red_tech could otherwise hold (or
+    resume) a test that has already moved into blue_evaluating.
+    """
+    expected_role = "blue_tech" if test.state == TestState.blue_evaluating else "red_tech"
+    if current_user.role != expected_role:
+        raise HTTPException(
+            status_code=403,
+            detail=f"Only {expected_role.replace('_', ' ')} can do this while the test is in '{test.state}'.",
+        )
+
+
 @router.post("/{test_id}/hold", response_model=TestOut)
 def hold_test(
     test_id: uuid.UUID,
@@ -1330,6 +1345,8 @@ def hold_test(
             detail=f"Cannot hold a test in state '{test.state}'. Only pre-validation states can be held.",
         )
 
+    _check_hold_permission(current_user, test)
+
     if test.is_on_hold:
         raise HTTPException(status_code=400, detail="Test is already on hold")
 
@@ -1370,6 +1387,8 @@ def resume_test(
     if not test.is_on_hold:
         raise HTTPException(status_code=400, detail="Test is not on hold")
 
+    _check_hold_permission(current_user, test)
+
     test.is_on_hold = False
     test.hold_reason = None
     test.held_at = None

backend/tests/test_hold_resume.py

@@ -31,6 +31,20 @@ def _seed_executing_test(db, technique, created_by) -> Test:
     return test
 
 
+def _seed_blue_evaluating_test(db, technique, created_by) -> Test:
+    test = Test(
+        technique_id=technique.id,
+        name="Holdable test (blue)",
+        created_by=created_by,
+        state=TestState.blue_evaluating,
+        blue_started_at=datetime.utcnow() - timedelta(minutes=10),
+    )
+    db.add(test)
+    db.commit()
+    db.refresh(test)
+    return test
+
+
 def test_hold_pauses_the_running_timer(client, db, red_tech_headers, red_tech_user):
     technique = _seed_technique(db)
     test = _seed_executing_test(db, technique, red_tech_user.id)
@@ -88,3 +102,49 @@ def test_hold_does_not_double_pause_an_already_paused_timer(client, db, red_tech
 
     db.refresh(test)
     assert test.paused_at == manual_pause_time
+
+
+def test_red_tech_cannot_hold_a_test_in_blue_evaluating(
+    client, db, red_tech_headers, red_tech_user,
+):
+    """Once a test has moved into Blue's queue, only blue_tech may hold it —
+    a red_tech is no longer involved at this stage."""
+    technique = _seed_technique(db)
+    test = _seed_blue_evaluating_test(db, technique, red_tech_user.id)
+
+    resp = client.post(
+        f"/api/v1/tests/{test.id}/hold",
+        json={"reason": "waiting on lab access"},
+        headers=red_tech_headers,
+    )
+    assert resp.status_code == 403
+
+
+def test_blue_tech_can_hold_a_test_in_blue_evaluating(
+    client, db, blue_tech_headers, red_tech_user,
+):
+    technique = _seed_technique(db)
+    test = _seed_blue_evaluating_test(db, technique, red_tech_user.id)
+
+    resp = client.post(
+        f"/api/v1/tests/{test.id}/hold",
+        json={"reason": "waiting on EDR access"},
+        headers=blue_tech_headers,
+    )
+    assert resp.status_code == 200, resp.text
+
+
+def test_blue_tech_cannot_resume_a_test_that_was_held_during_red_executing(
+    client, db, api, red_tech_headers, blue_tech_headers, red_tech_user,
+):
+    technique = _seed_technique(db)
+    test = _seed_executing_test(db, technique, red_tech_user.id)
+
+    resp = api(
+        "post", f"/api/v1/tests/{test.id}/hold", red_tech_headers,
+        json={"reason": "waiting on lab access"},
+    )
+    assert resp.status_code == 200, resp.text
+
+    resp = api("post", f"/api/v1/tests/{test.id}/resume", blue_tech_headers)
+    assert resp.status_code == 403

frontend/src/components/test-detail/TestDetailHeader.tsx

@@ -158,10 +158,13 @@ export default function TestDetailHeader({
 
   // ── Contextual action buttons ────────────────────────────────────
 
-  const HOLDABLE_STATES: TestState[] = ["draft", "red_executing", "blue_evaluating"];
+  // Whichever team currently "owns" the test is the only one who should see
+  // Hold — a red_tech shouldn't be able to hold a test that's already moved
+  // into blue_evaluating (and vice versa), even though both roles can hold
+  // during their own phase.
   const canHold =
-    HOLDABLE_STATES.includes(test.state) &&
-    (role === "red_tech" || role === "blue_tech");
+    (["draft", "red_executing"].includes(test.state) && role === "red_tech") ||
+    (test.state === "blue_evaluating" && role === "blue_tech");
 
   const renderActions = () => {
     const buttons: React.ReactNode[] = [];