diff --git a/tests/unit/domain/test_config_schemas.py b/tests/unit/domain/test_config_schemas.py
new file mode 100755
index 000000000..77bec38e1
--- /dev/null
+++ b/tests/unit/domain/test_config_schemas.py
@@ -0,0 +1,825 @@
+"""config_schemas 模块单测.
+
+覆盖：枚举类型、各子配置模型、完整Schema模型、normalize工具函数。
+"""
+
+import copy
+
+import pytest
+from domain.config_schemas import (
+    DEFAULT_EDIT_PLAN_CONFIG,
+    DEFAULT_EDIT_TEMPLATE_CONFIG,
+    BGMConfig,
+    BGMSource,
+    CoverConfig,
+    CoverType,
+    EditPlanConfigSchema,
+    EditTemplateConfigSchema,
+    ExportConfig,
+    FilterConfig,
+    ShadowConfig,
+    StrokeConfig,
+    SubtitleConfig,
+    TextAnimation,
+    TextPosition,
+    TitleConfig,
+    normalize_plan_config,
+    normalize_template_config,
+)
+from pydantic import ValidationError
+
+# ── 枚举测试 ──────────────────────────────────────────────────────────────────
+
+
+class TestCoverType:
+    """CoverType 枚举"""
+
+    def test_enum_values(self):
+        assert CoverType.AI_FRAME.value == "ai_frame"
+        assert CoverType.MANUAL.value == "manual"
+        assert CoverType.UPLOAD.value == "upload"
+        assert CoverType.AI_REGENERATE.value == "ai_regenerate"
+
+    def test_is_str_enum(self):
+        assert isinstance(CoverType.AI_FRAME, str)
+        assert CoverType.AI_FRAME == "ai_frame"
+
+    def test_from_string(self):
+        assert CoverType("ai_frame") == CoverType.AI_FRAME
+        assert CoverType("manual") == CoverType.MANUAL
+
+    def test_invalid_value_raises(self):
+        with pytest.raises(ValueError):
+            CoverType("invalid")
+
+
+class TestTextPosition:
+    """TextPosition 枚举"""
+
+    def test_enum_values(self):
+        assert TextPosition.TOP.value == "top"
+        assert TextPosition.CENTER.value == "center"
+        assert TextPosition.BOTTOM.value == "bottom"
+
+    def test_from_string(self):
+        assert TextPosition("top") == TextPosition.TOP
+        assert TextPosition("bottom") == TextPosition.BOTTOM
+
+    def test_invalid_value_raises(self):
+        with pytest.raises(ValueError):
+            TextPosition("left")
+
+
+class TestTextAnimation:
+    """TextAnimation 枚举"""
+
+    def test_enum_values(self):
+        assert TextAnimation.NONE.value == "none"
+        assert TextAnimation.FADE_IN.value == "fade_in"
+        assert TextAnimation.SLIDE_UP.value == "slide_up"
+        assert TextAnimation.SLIDE_DOWN.value == "slide_down"
+        assert TextAnimation.SCALE.value == "scale"
+
+    def test_from_string(self):
+        assert TextAnimation("fade_in") == TextAnimation.FADE_IN
+
+    def test_invalid_value_raises(self):
+        with pytest.raises(ValueError):
+            TextAnimation("bounce")
+
+
+class TestBGMSource:
+    """BGMSource 枚举"""
+
+    def test_enum_values(self):
+        assert BGMSource.LIBRARY.value == "library"
+        assert BGMSource.UPLOAD.value == "upload"
+        assert BGMSource.AI_RECOMMEND.value == "ai_recommend"
+
+    def test_from_string(self):
+        assert BGMSource("library") == BGMSource.LIBRARY
+
+    def test_invalid_value_raises(self):
+        with pytest.raises(ValueError):
+            BGMSource("spotify")
+
+
+# ── StrokeConfig / ShadowConfig ──────────────────────────────────────────────
+
+
+class TestStrokeConfig:
+    """StrokeConfig 描边配置"""
+
+    def test_default_values(self):
+        s = StrokeConfig()
+        assert s.enabled is False
+        assert s.color == "#000000"
+        assert s.width == 1
+
+    def test_custom_values(self):
+        s = StrokeConfig(enabled=True, color="#ff0000", width=5)
+        assert s.enabled is True
+        assert s.color == "#ff0000"
+        assert s.width == 5
+
+    def test_width_min_boundary(self):
+        s = StrokeConfig(width=1)
+        assert s.width == 1
+
+    def test_width_max_boundary(self):
+        s = StrokeConfig(width=10)
+        assert s.width == 10
+
+    def test_width_below_min_raises(self):
+        with pytest.raises(ValidationError):
+            StrokeConfig(width=0)
+
+    def test_width_above_max_raises(self):
+        with pytest.raises(ValidationError):
+            StrokeConfig(width=11)
+
+
+class TestShadowConfig:
+    """ShadowConfig 阴影配置"""
+
+    def test_default_values(self):
+        s = ShadowConfig()
+        assert s.enabled is False
+        assert s.blur == 4
+        assert s.offset_x == 2
+        assert s.offset_y == 2
+
+    def test_custom_values(self):
+        s = ShadowConfig(enabled=True, blur=10, offset_x=5, offset_y=5)
+        assert s.enabled is True
+        assert s.blur == 10
+        assert s.offset_x == 5
+        assert s.offset_y == 5
+
+    def test_blur_min_boundary(self):
+        s = ShadowConfig(blur=0)
+        assert s.blur == 0
+
+    def test_blur_max_boundary(self):
+        s = ShadowConfig(blur=20)
+        assert s.blur == 20
+
+    def test_blur_above_max_raises(self):
+        with pytest.raises(ValidationError):
+            ShadowConfig(blur=21)
+
+
+# ── CoverConfig ──────────────────────────────────────────────────────────────
+
+
+class TestCoverConfig:
+    """CoverConfig 封面配置"""
+
+    def test_default_values(self):
+        c = CoverConfig()
+        assert c.type == CoverType.AI_FRAME
+        assert c.image_url == ""
+        assert c.frame_time is None
+
+    def test_manual_type_with_frame_time(self):
+        c = CoverConfig(type=CoverType.MANUAL, frame_time=5.5)
+        assert c.type == CoverType.MANUAL
+        assert c.frame_time == 5.5
+
+    def test_upload_type_with_image_url(self):
+        c = CoverConfig(type=CoverType.UPLOAD, image_url="https://example.com/cover.jpg")
+        assert c.type == CoverType.UPLOAD
+        assert c.image_url == "https://example.com/cover.jpg"
+
+    def test_frame_time_negative_raises(self):
+        with pytest.raises(ValidationError):
+            CoverConfig(frame_time=-1.0)
+
+    def test_frame_time_zero_valid(self):
+        c = CoverConfig(frame_time=0.0)
+        assert c.frame_time == 0.0
+
+    def test_from_dict_with_string_enum(self):
+        c = CoverConfig(**{"type": "ai_regenerate", "image_url": ""})
+        assert c.type == CoverType.AI_REGENERATE
+
+
+# ── TitleConfig ───────────────────────────────────────────────────────────────
+
+
+class TestTitleConfig:
+    """TitleConfig 标题配置"""
+
+    def test_default_values(self):
+        t = TitleConfig()
+        assert t.enabled is True
+        assert t.ai_auto is True
+        assert t.text == ""
+        assert t.position == TextPosition.TOP
+        assert t.font == "思源黑体"
+        assert t.color == "#ffffff"
+        assert t.size == 48
+        assert t.bold is True
+        assert t.italic is False
+        assert isinstance(t.stroke, StrokeConfig)
+        assert isinstance(t.shadow, ShadowConfig)
+
+    def test_custom_title(self):
+        t = TitleConfig(
+            enabled=True,
+            ai_auto=False,
+            text="我的视频标题",
+            position=TextPosition.CENTER,
+            font="微软雅黑",
+            color="#000000",
+            size=36,
+            bold=False,
+            italic=True,
+        )
+        assert t.text == "我的视频标题"
+        assert t.position == TextPosition.CENTER
+        assert t.size == 36
+        assert t.bold is False
+        assert t.italic is True
+
+    def test_size_min_boundary(self):
+        t = TitleConfig(size=12)
+        assert t.size == 12
+
+    def test_size_max_boundary(self):
+        t = TitleConfig(size=120)
+        assert t.size == 120
+
+    def test_size_below_min_raises(self):
+        with pytest.raises(ValidationError):
+            TitleConfig(size=11)
+
+    def test_size_above_max_raises(self):
+        with pytest.raises(ValidationError):
+            TitleConfig(size=121)
+
+    def test_stroke_nested_config(self):
+        t = TitleConfig(stroke={"enabled": True, "color": "#ff0000", "width": 3})
+        assert t.stroke.enabled is True
+        assert t.stroke.color == "#ff0000"
+        assert t.stroke.width == 3
+
+    def test_shadow_nested_config(self):
+        t = TitleConfig(shadow={"enabled": True, "blur": 8, "offset_x": 3, "offset_y": 3})
+        assert t.shadow.enabled is True
+        assert t.shadow.blur == 8
+
+
+# ── SubtitleConfig ────────────────────────────────────────────────────────────
+
+
+class TestSubtitleConfig:
+    """SubtitleConfig 字幕配置"""
+
+    def test_default_values(self):
+        s = SubtitleConfig()
+        assert s.enabled is True
+        assert s.position == TextPosition.BOTTOM
+        assert s.font == "思源黑体"
+        assert s.color == "#ffffff"
+        assert s.size == 24
+        assert s.animation == TextAnimation.FADE_IN
+        assert s.auto_generated is False
+        assert s.language == ""
+        assert s.max_chars_per_line == 20
+        assert s.min_chars_per_segment == 8
+
+    def test_custom_subtitle(self):
+        s = SubtitleConfig(
+            enabled=False,
+            position=TextPosition.TOP,
+            size=32,
+            animation=TextAnimation.SLIDE_UP,
+            auto_generated=True,
+            language="zh",
+            max_chars_per_line=30,
+            min_chars_per_segment=10,
+        )
+        assert s.enabled is False
+        assert s.position == TextPosition.TOP
+        assert s.size == 32
+        assert s.animation == TextAnimation.SLIDE_UP
+        assert s.auto_generated is True
+        assert s.language == "zh"
+
+    def test_size_min_boundary(self):
+        s = SubtitleConfig(size=12)
+        assert s.size == 12
+
+    def test_size_max_boundary(self):
+        s = SubtitleConfig(size=60)
+        assert s.size == 60
+
+    def test_size_below_min_raises(self):
+        with pytest.raises(ValidationError):
+            SubtitleConfig(size=11)
+
+    def test_max_chars_min_boundary(self):
+        s = SubtitleConfig(max_chars_per_line=8)
+        assert s.max_chars_per_line == 8
+
+    def test_max_chars_max_boundary(self):
+        s = SubtitleConfig(max_chars_per_line=40)
+        assert s.max_chars_per_line == 40
+
+    def test_max_chars_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            SubtitleConfig(max_chars_per_line=41)
+
+    def test_min_chars_min_boundary(self):
+        s = SubtitleConfig(min_chars_per_segment=2)
+        assert s.min_chars_per_segment == 2
+
+    def test_min_chars_max_boundary(self):
+        s = SubtitleConfig(min_chars_per_segment=20)
+        assert s.min_chars_per_segment == 20
+
+    def test_min_chars_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            SubtitleConfig(min_chars_per_segment=1)
+
+
+# ── BGMConfig ─────────────────────────────────────────────────────────────────
+
+
+class TestBGMConfig:
+    """BGMConfig BGM配置"""
+
+    def test_default_values(self):
+        b = BGMConfig()
+        assert b.enabled is False
+        assert b.source == BGMSource.LIBRARY
+        assert b.asset_id == ""
+        assert b.preset_id == ""
+        assert b.audio_url == ""
+        assert b.volume == 0.3
+        assert b.fade_in == 0.0
+        assert b.fade_out == 0.0
+        assert b.loop_enabled is True
+        assert b.sidechain_enabled is False
+        assert b.sidechain_ratio == 0.3
+        assert b.sidechain_attack == 0.02
+        assert b.sidechain_release == 0.5
+        assert b.sidechain_threshold == -25.0
+
+    def test_custom_bgm(self):
+        b = BGMConfig(
+            enabled=True,
+            source=BGMSource.UPLOAD,
+            asset_id="bgm_123",
+            volume=0.5,
+            fade_in=2.0,
+            fade_out=3.0,
+            sidechain_enabled=True,
+            sidechain_ratio=0.5,
+        )
+        assert b.enabled is True
+        assert b.source == BGMSource.UPLOAD
+        assert b.volume == 0.5
+        assert b.sidechain_enabled is True
+        assert b.sidechain_ratio == 0.5
+
+    def test_volume_range(self):
+        b = BGMConfig(volume=0.0)
+        assert b.volume == 0.0
+        b = BGMConfig(volume=1.0)
+        assert b.volume == 1.0
+
+    def test_volume_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            BGMConfig(volume=-0.1)
+        with pytest.raises(ValidationError):
+            BGMConfig(volume=1.1)
+
+    def test_fade_in_range(self):
+        b = BGMConfig(fade_in=30.0)
+        assert b.fade_in == 30.0
+
+    def test_fade_in_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            BGMConfig(fade_in=31.0)
+
+    def test_sidechain_attack_min(self):
+        b = BGMConfig(sidechain_attack=0.001)
+        assert b.sidechain_attack == 0.001
+
+    def test_sidechain_attack_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            BGMConfig(sidechain_attack=0.0001)
+
+    def test_sidechain_threshold_range(self):
+        b = BGMConfig(sidechain_threshold=-60.0)
+        assert b.sidechain_threshold == -60.0
+        b = BGMConfig(sidechain_threshold=0.0)
+        assert b.sidechain_threshold == 0.0
+
+    def test_sidechain_threshold_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            BGMConfig(sidechain_threshold=-61.0)
+        with pytest.raises(ValidationError):
+            BGMConfig(sidechain_threshold=1.0)
+
+
+# ── ExportConfig ──────────────────────────────────────────────────────────────
+
+
+class TestExportConfig:
+    """ExportConfig 导出配置"""
+
+    def test_default_values(self):
+        e = ExportConfig()
+        assert e.resolution == "1080x1920"
+        assert e.fps == 30
+        assert e.video_bitrate == 8000
+        assert e.audio_bitrate == 128
+        assert e.format == "mp4"
+        assert e.quality_preset == "balanced"
+        assert e.watermark_enabled is False
+        assert e.watermark_text == ""
+
+    def test_custom_export(self):
+        e = ExportConfig(
+            resolution="720x1280",
+            fps=60,
+            video_bitrate=5000,
+            audio_bitrate=192,
+            format="mov",
+            quality_preset="high",
+            watermark_enabled=True,
+            watermark_text="我的水印",
+        )
+        assert e.resolution == "720x1280"
+        assert e.fps == 60
+        assert e.format == "mov"
+        assert e.watermark_enabled is True
+
+    def test_fps_min_boundary(self):
+        e = ExportConfig(fps=15)
+        assert e.fps == 15
+
+    def test_fps_max_boundary(self):
+        e = ExportConfig(fps=60)
+        assert e.fps == 60
+
+    def test_fps_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            ExportConfig(fps=14)
+        with pytest.raises(ValidationError):
+            ExportConfig(fps=61)
+
+    def test_video_bitrate_range(self):
+        e = ExportConfig(video_bitrate=1000)
+        assert e.video_bitrate == 1000
+        e = ExportConfig(video_bitrate=20000)
+        assert e.video_bitrate == 20000
+
+    def test_video_bitrate_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            ExportConfig(video_bitrate=999)
+        with pytest.raises(ValidationError):
+            ExportConfig(video_bitrate=20001)
+
+    def test_audio_bitrate_range(self):
+        e = ExportConfig(audio_bitrate=64)
+        assert e.audio_bitrate == 64
+        e = ExportConfig(audio_bitrate=320)
+        assert e.audio_bitrate == 320
+
+
+# ── FilterConfig ──────────────────────────────────────────────────────────────
+
+
+class TestFilterConfig:
+    """FilterConfig 滤镜配置"""
+
+    def test_default_values(self):
+        f = FilterConfig()
+        assert f.enabled is False
+        assert f.preset_id == "filter_none"
+        assert f.intensity == 100
+        assert f.brightness == 0.0
+        assert f.contrast == 1.0
+        assert f.saturation == 1.0
+        assert f.warmth == 0.0
+
+    def test_custom_filter(self):
+        f = FilterConfig(
+            enabled=True,
+            preset_id="vintage",
+            intensity=50,
+            brightness=0.3,
+            contrast=1.5,
+            saturation=2.0,
+            warmth=-0.5,
+        )
+        assert f.enabled is True
+        assert f.preset_id == "vintage"
+        assert f.intensity == 50
+        assert f.brightness == 0.3
+
+    def test_intensity_range(self):
+        f = FilterConfig(intensity=0)
+        assert f.intensity == 0
+        f = FilterConfig(intensity=100)
+        assert f.intensity == 100
+
+    def test_intensity_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            FilterConfig(intensity=-1)
+        with pytest.raises(ValidationError):
+            FilterConfig(intensity=101)
+
+    def test_brightness_range(self):
+        f = FilterConfig(brightness=-1.0)
+        assert f.brightness == -1.0
+        f = FilterConfig(brightness=1.0)
+        assert f.brightness == 1.0
+
+    def test_contrast_range(self):
+        f = FilterConfig(contrast=0.0)
+        assert f.contrast == 0.0
+        f = FilterConfig(contrast=2.0)
+        assert f.contrast == 2.0
+
+    def test_saturation_range(self):
+        f = FilterConfig(saturation=0.0)
+        assert f.saturation == 0.0
+        f = FilterConfig(saturation=3.0)
+        assert f.saturation == 3.0
+
+    def test_warmth_range(self):
+        f = FilterConfig(warmth=-1.0)
+        assert f.warmth == -1.0
+        f = FilterConfig(warmth=1.0)
+        assert f.warmth == 1.0
+
+    def test_brightness_out_of_range_raises(self):
+        with pytest.raises(ValidationError):
+            FilterConfig(brightness=-1.1)
+        with pytest.raises(ValidationError):
+            FilterConfig(brightness=1.1)
+
+
+# ── 完整 Schema 模型 ──────────────────────────────────────────────────────────
+
+
+class TestEditPlanConfigSchema:
+    """EditPlanConfigSchema 完整计划配置"""
+
+    def test_default_values(self):
+        s = EditPlanConfigSchema()
+        assert isinstance(s.cover, CoverConfig)
+        assert isinstance(s.title, TitleConfig)
+        assert isinstance(s.subtitle, SubtitleConfig)
+        assert isinstance(s.bgm, BGMConfig)
+        assert isinstance(s.export, ExportConfig)
+        assert isinstance(s.filter, FilterConfig)
+        assert s.editing_mode == "one_take"
+
+    def test_partial_update_via_dict(self):
+        s = EditPlanConfigSchema(
+            **{
+                "cover": {"type": "manual", "frame_time": 10.0},
+                "title": {"text": "自定义标题", "size": 60},
+                "editing_mode": "template",
+            }
+        )
+        assert s.cover.type == CoverType.MANUAL
+        assert s.cover.frame_time == 10.0
+        assert s.title.text == "自定义标题"
+        assert s.title.size == 60
+        assert s.editing_mode == "template"
+
+    def test_full_config_dict_roundtrip(self):
+        data = copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
+        data["title"]["text"] = "测试标题"
+        data["bgm"]["enabled"] = True
+        s = EditPlanConfigSchema(**data)
+        assert s.title.text == "测试标题"
+        assert s.bgm.enabled is True
+        # 默认字段保留
+        assert s.subtitle.size == 24
+        assert s.export.fps == 30
+
+    def test_invalid_subfield_raises(self):
+        with pytest.raises(ValidationError):
+            EditPlanConfigSchema(**{"title": {"size": 999}})
+
+
+class TestEditTemplateConfigSchema:
+    """EditTemplateConfigSchema 模板配置"""
+
+    def test_default_values(self):
+        s = EditTemplateConfigSchema()
+        assert isinstance(s.cover, CoverConfig)
+        assert s.editing_mode == "one_take"
+        assert s.transition_enabled is True
+
+    def test_custom_transition_enabled(self):
+        s = EditTemplateConfigSchema(transition_enabled=False)
+        assert s.transition_enabled is False
+
+    def test_has_all_plan_fields(self):
+        s = EditTemplateConfigSchema()
+        assert hasattr(s, "cover")
+        assert hasattr(s, "title")
+        assert hasattr(s, "subtitle")
+        assert hasattr(s, "bgm")
+        assert hasattr(s, "export")
+        assert hasattr(s, "filter")
+        assert hasattr(s, "editing_mode")
+        assert hasattr(s, "transition_enabled")
+
+
+# ── 默认值常量 ────────────────────────────────────────────────────────────────
+
+
+class TestDefaultConfigs:
+    """默认配置常量"""
+
+    def test_default_plan_config_structure(self):
+        assert "cover" in DEFAULT_EDIT_PLAN_CONFIG
+        assert "title" in DEFAULT_EDIT_PLAN_CONFIG
+        assert "subtitle" in DEFAULT_EDIT_PLAN_CONFIG
+        assert "bgm" in DEFAULT_EDIT_PLAN_CONFIG
+        assert "export" in DEFAULT_EDIT_PLAN_CONFIG
+        assert "filter" in DEFAULT_EDIT_PLAN_CONFIG
+        assert "editing_mode" in DEFAULT_EDIT_PLAN_CONFIG
+
+    def test_default_template_config_extra_field(self):
+        assert "transition_enabled" in DEFAULT_EDIT_TEMPLATE_CONFIG
+        assert DEFAULT_EDIT_TEMPLATE_CONFIG["transition_enabled"] is True
+
+    def test_template_config_inherits_plan(self):
+        # 模板配置应该包含计划配置的所有字段
+        for key in DEFAULT_EDIT_PLAN_CONFIG:
+            assert key in DEFAULT_EDIT_TEMPLATE_CONFIG
+
+    def test_defaults_are_valid_for_schema(self):
+        # 默认值应该能通过 schema 校验
+        plan = EditPlanConfigSchema(**DEFAULT_EDIT_PLAN_CONFIG)
+        assert plan.editing_mode == "one_take"
+        template = EditTemplateConfigSchema(**DEFAULT_EDIT_TEMPLATE_CONFIG)
+        assert template.transition_enabled is True
+
+    def test_mutation_does_not_affect_original(self):
+        # 修改返回的 dict 不应该影响常量
+        d = copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
+        d["cover"]["type"] = "upload"
+        assert DEFAULT_EDIT_PLAN_CONFIG["cover"]["type"] == "ai_frame"
+
+
+# ── normalize_plan_config ────────────────────────────────────────────────────
+
+
+class TestNormalizePlanConfig:
+    """normalize_plan_config 工具函数"""
+
+    def test_none_returns_full_defaults(self):
+        result = normalize_plan_config(None)
+        assert result == copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
+
+    def test_empty_dict_returns_defaults(self):
+        result = normalize_plan_config({})
+        assert result == copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
+
+    def test_partial_cover_update(self):
+        result = normalize_plan_config({"cover": {"type": "manual"}})
+        assert result["cover"]["type"] == "manual"
+        # 其他 cover 字段保留默认
+        assert result["cover"]["image_url"] == ""
+        assert result["cover"]["frame_time"] is None
+
+    def test_partial_title_update(self):
+        result = normalize_plan_config({"title": {"text": "我的标题", "size": 36}})
+        assert result["title"]["text"] == "我的标题"
+        assert result["title"]["size"] == 36
+        assert result["title"]["font"] == "思源黑体"
+
+    def test_partial_subtitle_update(self):
+        result = normalize_plan_config({"subtitle": {"size": 28}})
+        assert result["subtitle"]["size"] == 28
+        assert result["subtitle"]["position"] == "bottom"
+
+    def test_partial_bgm_update(self):
+        result = normalize_plan_config({"bgm": {"enabled": True, "volume": 0.5}})
+        assert result["bgm"]["enabled"] is True
+        assert result["bgm"]["volume"] == 0.5
+        assert result["bgm"]["source"] == "library"
+
+    def test_editing_mode_update(self):
+        result = normalize_plan_config({"editing_mode": "template"})
+        assert result["editing_mode"] == "template"
+
+    def test_extra_fields_preserved(self):
+        result = normalize_plan_config({"generation_task_id": "task_123", "custom_field": "value"})
+        assert result["generation_task_id"] == "task_123"
+        assert result["custom_field"] == "value"
+        # 标准字段也保留
+        assert result["editing_mode"] == "one_take"
+
+    def test_combined_update(self):
+        result = normalize_plan_config(
+            {
+                "cover": {"type": "upload", "image_url": "http://x.com/c.jpg"},
+                "title": {"text": "标题", "size": 60},
+                "bgm": {"enabled": True},
+                "editing_mode": "smart",
+                "extra_key": "extra_value",
+            }
+        )
+        assert result["cover"]["type"] == "upload"
+        assert result["title"]["text"] == "标题"
+        assert result["bgm"]["enabled"] is True
+        assert result["editing_mode"] == "smart"
+        assert result["extra_key"] == "extra_value"
+
+    def test_non_dict_section_ignored(self):
+        result = normalize_plan_config({"cover": "not_a_dict"})
+        # cover 应该还是默认值
+        assert result["cover"]["type"] == "ai_frame"
+
+    def test_editing_mode_non_string_ignored(self):
+        result = normalize_plan_config({"editing_mode": 123})
+        assert result["editing_mode"] == "one_take"
+
+    def test_does_not_mutate_input(self):
+        raw = {"cover": {"type": "manual"}, "extra": "value"}
+        raw_copy = copy.deepcopy(raw)
+        normalize_plan_config(raw)
+        assert raw == raw_copy
+
+    def test_does_not_mutate_defaults(self):
+        original = copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
+        normalize_plan_config({"cover": {"type": "upload"}})
+        assert DEFAULT_EDIT_PLAN_CONFIG == original
+
+
+# ── normalize_template_config ─────────────────────────────────────────────────
+
+
+class TestNormalizeTemplateConfig:
+    """normalize_template_config 工具函数"""
+
+    def test_none_returns_full_defaults(self):
+        result = normalize_template_config(None)
+        assert result == copy.deepcopy(DEFAULT_EDIT_TEMPLATE_CONFIG)
+
+    def test_empty_dict_returns_defaults(self):
+        result = normalize_template_config({})
+        assert result == copy.deepcopy(DEFAULT_EDIT_TEMPLATE_CONFIG)
+        assert result["transition_enabled"] is True
+
+    def test_partial_sections(self):
+        result = normalize_template_config(
+            {
+                "title": {"text": "模板标题"},
+                "bgm": {"enabled": True},
+            }
+        )
+        assert result["title"]["text"] == "模板标题"
+        assert result["bgm"]["enabled"] is True
+
+    def test_transition_enabled_update(self):
+        result = normalize_template_config({"transition_enabled": False})
+        assert result["transition_enabled"] is False
+
+    def test_transition_enabled_non_bool_ignored(self):
+        result = normalize_template_config({"transition_enabled": "yes"})
+        assert result["transition_enabled"] is True
+
+    def test_editing_mode_update(self):
+        result = normalize_template_config({"editing_mode": "story"})
+        assert result["editing_mode"] == "story"
+
+    def test_extra_fields_preserved(self):
+        result = normalize_template_config({"template_version": "v2", "author": "test"})
+        assert result["template_version"] == "v2"
+        assert result["author"] == "test"
+        assert result["transition_enabled"] is True
+
+    def test_combined_update(self):
+        result = normalize_template_config(
+            {
+                "cover": {"type": "ai_regenerate"},
+                "subtitle": {"size": 20},
+                "transition_enabled": False,
+                "editing_mode": "vlog",
+                "tags": ["travel", "food"],
+            }
+        )
+        assert result["cover"]["type"] == "ai_regenerate"
+        assert result["subtitle"]["size"] == 20
+        assert result["transition_enabled"] is False
+        assert result["editing_mode"] == "vlog"
+        assert result["tags"] == ["travel", "food"]
+
+    def test_does_not_mutate_defaults(self):
+        original = copy.deepcopy(DEFAULT_EDIT_TEMPLATE_CONFIG)
+        normalize_template_config({"transition_enabled": False})
+        assert DEFAULT_EDIT_TEMPLATE_CONFIG == original