diff --git a/tests/unit/test_mediakit_smart_clips.py b/tests/unit/test_mediakit_smart_clips.py
index e06283548..73143849d 100644
--- a/tests/unit/test_mediakit_smart_clips.py
+++ b/tests/unit/test_mediakit_smart_clips.py
@@ -306,6 +306,26 @@ class TestGetTemplateSegments:
 # ── from-assets 端点集成测试 ────────────────────────────────────────────────
 
 
+def _patch_zero_noise():
+    """消除 clips.py 排序随机噪声（SCORE_RANDOM_NOISE_MAX 噪声返回 0）。
+
+    用于均衡分配等确定性断言；其他 uniform 调用（片段时长随机）行为不变。
+    """
+    import random as _stdlib_random
+
+    from app.api.routes.templates_editor import clips as clips_module
+    from packages.domain.smart_match import SCORE_RANDOM_NOISE_MAX
+
+    _fallback = _stdlib_random.Random()
+
+    def _fake_uniform(a, b):
+        if b == SCORE_RANDOM_NOISE_MAX:
+            return 0.0
+        return _fallback.uniform(a, b)
+
+    return patch.object(clips_module.random, "uniform", _fake_uniform)
+
+
 def _make_auth_user():
     auth = MagicMock()
     auth.user.id = "user-001"
@@ -470,16 +490,18 @@ class TestFromAssetsByTemplateSegments:
         mock_asset_repo.get.side_effect = get_asset
 
         body = ClipsFromAssetsRequest(asset_ids=["a1", "a2"])
-        create_clips_from_assets_editor(
-            template_id="tmpl-1",
-            body=body,
-            background_tasks=MagicMock(),
-            plan_id="plan-1",
-            services=(mock_tpl_svc, mock_plan_svc),
-            asset_repo=mock_asset_repo,
-            db=MagicMock(),
-            current_user=_make_auth_user(),
-        )
+        # 消除排序噪声，确定性断言贪心均衡分配
+        with _patch_zero_noise():
+            create_clips_from_assets_editor(
+                template_id="tmpl-1",
+                body=body,
+                background_tasks=MagicMock(),
+                plan_id="plan-1",
+                services=(mock_tpl_svc, mock_plan_svc),
+                asset_repo=mock_asset_repo,
+                db=MagicMock(),
+                current_user=_make_auth_user(),
+            )
 
         clips_data = _get_clips_data(mock_plan_svc)
         asset_ids = [c["asset_id"] for c in clips_data]