diff --git a/tests/unit/test_module_registry.py b/tests/unit/test_module_registry.py
index 41ccced6e..e473c2a28 100755
--- a/tests/unit/test_module_registry.py
+++ b/tests/unit/test_module_registry.py
@@ -382,3 +382,297 @@ class TestModuleStatus:
         assert ModuleStatus.ACTIVE.value == "active"
         assert ModuleStatus.DISABLED.value == "disabled"
         assert ModuleStatus.ERROR.value == "error"
+
+
+# ── Module 更多状态转换测试 ──────────────────────────────────────────────────
+
+
+class TestModuleStateTransitions:
+    """Module 状态转换补充测试."""
+
+    def test_activate_twice_idempotent(self):
+        """多次激活不报错."""
+        mod = Module(name="m1")
+        mod.activate()
+        mod.activate()
+        assert mod.status == ModuleStatus.ACTIVE
+
+    def test_disable_twice_idempotent(self):
+        """多次禁用不报错."""
+        mod = Module(name="m1", status=ModuleStatus.ACTIVE)
+        mod.disable()
+        mod.disable()
+        assert mod.status == ModuleStatus.DISABLED
+
+    def test_disable_from_registered(self):
+        """从registered状态禁用."""
+        mod = Module(name="m1")
+        mod.disable()
+        assert mod.status == ModuleStatus.DISABLED
+
+    def test_activate_after_disable(self):
+        """禁用后重新激活."""
+        mod = Module(name="m1")
+        mod.activate()
+        mod.disable()
+        mod.activate()
+        assert mod.status == ModuleStatus.ACTIVE
+
+    def test_error_state_cannot_be_activated(self):
+        """error状态不能被激活."""
+        mod = Module(name="m1", status=ModuleStatus.ERROR)
+        mod.activate()
+        assert mod.status == ModuleStatus.ERROR
+
+    def test_error_state_can_be_disabled(self):
+        """error状态可以被禁用（disable 不检查状态）."""
+        mod = Module(name="m1", status=ModuleStatus.ERROR)
+        mod.disable()
+        assert mod.status == ModuleStatus.DISABLED
+
+
+# ── ModuleRegistry 注册补充测试 ──────────────────────────────────────────────
+
+
+class TestModuleRegistryRegisterMore:
+    """模块注册补充场景."""
+
+    def test_register_multiple_modules(self):
+        """注册多个模块."""
+        registry = ModuleRegistry()
+        for i in range(5):
+            registry.register(Module(name=f"mod_{i}"))
+        assert len(registry.list_modules()) == 5
+
+    def test_register_order_independent_deps(self):
+        """先注册依赖方，后注册被依赖方，依赖方不会自动激活."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="plugin", dependencies=["core"]))
+        assert registry.get("plugin").status == ModuleStatus.REGISTERED
+        # 注册core后，plugin仍然是REGISTERED（不会自动检查）
+        registry.register(Module(name="core"))
+        assert registry.get("core").status == ModuleStatus.ACTIVE
+
+    def test_register_with_multiple_deps_all_satisfied(self):
+        """所有依赖都满足时自动激活."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="dep_a"))
+        registry.register(Module(name="dep_b"))
+        registry.register(Module(name="plugin", dependencies=["dep_a", "dep_b"]))
+        assert registry.get("plugin").status == ModuleStatus.ACTIVE
+
+    def test_register_with_multiple_deps_partial_missing(self):
+        """部分依赖缺失时不激活."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="dep_a"))
+        registry.register(Module(name="plugin", dependencies=["dep_a", "dep_b"]))
+        assert registry.get("plugin").status == ModuleStatus.REGISTERED
+
+    def test_register_self_dependency_handled(self):
+        """自依赖不会导致死循环（依赖检查时找不到自己）."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="self_dep", dependencies=["self_dep"]))
+        # 注册时自己还没加入 _modules，检查依赖时找不到，保持REGISTERED
+        assert registry.get("self_dep").status == ModuleStatus.REGISTERED
+
+
+# ── ModuleRegistry 能力查询补充 ─────────────────────────────────────────────
+
+
+class TestModuleRegistryCapabilitiesMore:
+    """能力查询补充测试."""
+
+    def test_multiple_modules_same_capability_returns_first(self):
+        """多个模块提供同一能力，get_capability返回第一个."""
+        registry = ModuleRegistry()
+        cap1 = ModuleCapability(name="render", description="渲染器A")
+        cap2 = ModuleCapability(name="render", description="渲染器B")
+        registry.register(Module(name="mod_a", capabilities=[cap1]))
+        registry.register(Module(name="mod_b", capabilities=[cap2]))
+        result = registry.get_capability("render")
+        assert result is not None
+        assert result.name == "render"
+
+    def test_has_capability_case_sensitive(self):
+        """能力名大小写敏感."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="m1", capabilities=[ModuleCapability(name="Render")]))
+        assert registry.has_capability("Render") is True
+        assert registry.has_capability("render") is False
+
+    def test_get_quota_rules_nonexistent_capability(self):
+        """不存在的能力返回空配额列表."""
+        registry = ModuleRegistry()
+        rules = registry.get_quota_rules("nonexistent")
+        assert rules == []
+
+    def test_get_active_capabilities_empty_registry(self):
+        """空注册中心返回空字典."""
+        registry = ModuleRegistry()
+        result = registry.get_active_capabilities()
+        assert result == {}
+
+    def test_get_active_capabilities_skips_inactive(self):
+        """非激活模块的能力不计入."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="active_mod", capabilities=[ModuleCapability(name="cap1")]))
+        disabled = Module(
+            name="disabled_mod",
+            status=ModuleStatus.DISABLED,
+            capabilities=[ModuleCapability(name="cap2")],
+        )
+        registry._modules["disabled_mod"] = disabled
+        result = registry.get_active_capabilities()
+        assert "active_mod" in result
+        assert "disabled_mod" not in result
+
+    def test_get_active_capabilities_skips_no_cap_modules(self):
+        """无能力的模块不出现在结果中."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="no_cap_mod"))
+        registry.register(Module(name="has_cap_mod", capabilities=[ModuleCapability(name="cap1")]))
+        result = registry.get_active_capabilities()
+        assert "no_cap_mod" not in result
+        assert "has_cap_mod" in result
+
+    def test_module_with_multiple_capabilities(self):
+        """单个模块有多个能力."""
+        registry = ModuleRegistry()
+        caps = [
+            ModuleCapability(name="cap_a"),
+            ModuleCapability(name="cap_b"),
+            ModuleCapability(name="cap_c"),
+        ]
+        registry.register(Module(name="multi_mod", capabilities=caps))
+        assert registry.has_capability("cap_a")
+        assert registry.has_capability("cap_b")
+        assert registry.has_capability("cap_c")
+        assert len(registry.get_active_capabilities()["multi_mod"]) == 3
+
+
+# ── ModuleRegistry 依赖检查补充 ────────────────────────────────────────────
+
+
+class TestModuleRegistryDependenciesMore:
+    """依赖检查补充测试."""
+
+    def test_multiple_dependencies_all_active(self):
+        """多个依赖都激活."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="dep1"))
+        registry.register(Module(name="dep2"))
+        registry.register(Module(name="dep3"))
+        registry.register(Module(name="plugin", dependencies=["dep1", "dep2", "dep3"]))
+        assert registry.check_dependencies("plugin") is True
+
+    def test_multiple_dependencies_one_inactive(self):
+        """多个依赖中有一个未激活."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="dep1"))
+        dep2 = Module(name="dep2", status=ModuleStatus.DISABLED)
+        registry._modules["dep2"] = dep2
+        registry.register(Module(name="plugin", dependencies=["dep1", "dep2"]))
+        # 注册时dep2不是ACTIVE，plugin不会自动激活
+        assert registry.check_dependencies("plugin") is False
+
+    def test_chain_dependencies(self):
+        """链式依赖 A→B→C."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="c"))
+        registry.register(Module(name="b", dependencies=["c"]))
+        registry.register(Module(name="a", dependencies=["b"]))
+        # a 依赖 b（ACTIVE），b 依赖 c（ACTIVE）
+        # check_dependencies 只检查直接依赖，b 是 ACTIVE 的
+        assert registry.check_dependencies("a") is True
+        assert registry.get("a").status == ModuleStatus.ACTIVE
+
+    def test_no_dependencies_always_satisfied(self):
+        """无依赖的模块总是满足依赖检查."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="standalone"))
+        assert registry.check_dependencies("standalone") is True
+
+
+# ── ModuleRegistry list_modules 补充 ──────────────────────────────────────
+
+
+class TestModuleRegistryListMore:
+    """list_modules 补充测试."""
+
+    def test_list_modules_empty(self):
+        """空注册中心."""
+        registry = ModuleRegistry()
+        assert registry.list_modules() == []
+
+    def test_list_modules_registered_status(self):
+        """按registered状态过滤."""
+        registry = ModuleRegistry()
+        registry.register(Module(name="active_mod"))  # auto ACTIVE
+        pending = Module(name="pending_mod")
+        registry._modules["pending_mod"] = pending  # REGISTERED
+        registered = registry.list_modules(status=ModuleStatus.REGISTERED)
+        assert len(registered) == 1
+        assert registered[0].name == "pending_mod"
+
+    def test_list_modules_error_status(self):
+        """按error状态过滤."""
+        registry = ModuleRegistry()
+        error_mod = Module(name="err", status=ModuleStatus.ERROR)
+        registry._modules["err"] = error_mod
+        errors = registry.list_modules(status=ModuleStatus.ERROR)
+        assert len(errors) == 1
+        assert errors[0].name == "err"
+
+
+# ── QuotaRule 补充测试 ──────────────────────────────────────────────────────
+
+
+class TestQuotaRuleMore:
+    """QuotaRule 补充测试."""
+
+    def test_zero_per_operation(self):
+        """零消耗配额规则."""
+        rule = QuotaRule(dimension="free_ops", per_operation=0.0)
+        assert rule.per_operation == 0.0
+
+    def test_fractional_per_operation(self):
+        """小数消耗配额规则."""
+        rule = QuotaRule(dimension="storage", per_operation=0.001)
+        assert rule.per_operation == 0.001
+
+    def test_large_per_operation(self):
+        """大数值消耗."""
+        rule = QuotaRule(dimension="tokens", per_operation=10000.0)
+        assert rule.per_operation == 10000.0
+
+
+# ── ModuleCapability 补充测试 ──────────────────────────────────────────────
+
+
+class TestModuleCapabilityMore:
+    """ModuleCapability 补充测试."""
+
+    def test_empty_metadata(self):
+        """默认metadata为空字典."""
+        cap = ModuleCapability(name="test")
+        assert cap.metadata == {}
+
+    def test_metadata_preserved(self):
+        """元数据完整保存."""
+        meta = {"model": "v1", "speed": 1.5, "enabled": True}
+        cap = ModuleCapability(name="test", metadata=meta)
+        assert cap.metadata["model"] == "v1"
+        assert cap.metadata["speed"] == 1.5
+        assert cap.metadata["enabled"] is True
+
+    def test_multiple_quota_rules(self):
+        """多个配额规则."""
+        rules = [
+            QuotaRule("dim1", 1.0),
+            QuotaRule("dim2", 2.0),
+            QuotaRule("dim3", 3.0),
+        ]
+        cap = ModuleCapability(name="test", quota_rules=rules)
+        assert len(cap.quota_rules) == 3
+        assert cap.quota_rules[0].dimension == "dim1"
+        assert cap.quota_rules[2].per_operation == 3.0
diff --git a/tests/unit/test_subtitle_domain.py b/tests/unit/test_subtitle_domain.py
index 734c3c038..74dfe6c69 100755
--- a/tests/unit/test_subtitle_domain.py
+++ b/tests/unit/test_subtitle_domain.py
@@ -270,3 +270,210 @@ class TestMergeSegments:
         assert result.text == "第一第二"
         assert result.start == 0.0
         assert result.end == 2.0
+
+
+# ── merge_short_segments 更多边界 ──────────────────────────────────────
+
+
+class TestMergeShortSegmentsMore:
+    """merge_short_segments 补充边界测试."""
+
+    def test_all_short_segments_merged_into_one(self):
+        """所有片段都很短，合并成一段."""
+        segs = [
+            SubtitleSegment(text="你", start=0.0, end=0.1),
+            SubtitleSegment(text="好", start=0.1, end=0.2),
+            SubtitleSegment(text="世", start=0.2, end=0.3),
+            SubtitleSegment(text="界", start=0.3, end=0.4),
+        ]
+        tl = SubtitleTimeline(segments=segs)
+        result = tl.merge_short_segments(min_chars=8)
+        assert result.segment_count == 1
+        assert result.segments[0].text == "你好世界"
+        assert result.segments[0].start == 0.0
+        assert result.segments[0].end == 0.4
+
+    def test_min_chars_very_small(self):
+        """min_chars 很小（1），几乎不合并."""
+        segs = [
+            SubtitleSegment(text="一", start=0.0, end=0.5),
+            SubtitleSegment(text="二", start=0.5, end=1.0),
+            SubtitleSegment(text="三", start=1.0, end=1.5),
+        ]
+        tl = SubtitleTimeline(segments=segs)
+        result = tl.merge_short_segments(min_chars=1)
+        # 每个1字 >= min_chars(1)，所以都独立成段
+        assert result.segment_count == 3
+
+    def test_min_chars_very_large(self):
+        """min_chars 很大，全部合并."""
+        segs = [
+            SubtitleSegment(text="第一句很长的内容", start=0.0, end=1.0),
+            SubtitleSegment(text="第二句也不短", start=1.0, end=2.0),
+            SubtitleSegment(text="第三句还行", start=2.0, end=3.0),
+        ]
+        tl = SubtitleTimeline(segments=segs)
+        result = tl.merge_short_segments(min_chars=100)
+        assert result.segment_count == 1
+        assert result.total_chars == tl.total_chars
+
+    def test_merge_preserves_total_duration(self):
+        """合并后总时长不变."""
+        segs = [
+            SubtitleSegment(text="短1", start=0.0, end=0.5),
+            SubtitleSegment(text="短2", start=0.5, end=1.0),
+            SubtitleSegment(text="很长的一段内容", start=1.0, end=3.0),
+        ]
+        tl = SubtitleTimeline(segments=segs, total_duration=3.0)
+        result = tl.merge_short_segments(min_chars=4)
+        assert result.total_duration == 3.0
+
+    def test_merge_preserves_word_level_info(self):
+        """合并后词级信息完整保留."""
+        w1 = [SubtitleWord(text="你", start=0.0, end=0.3)]
+        w2 = [SubtitleWord(text="好", start=0.3, end=0.6)]
+        segs = [
+            SubtitleSegment(text="你", start=0.0, end=0.3, words=w1),
+            SubtitleSegment(text="好", start=0.3, end=0.6, words=w2),
+        ]
+        tl = SubtitleTimeline(segments=segs)
+        result = tl.merge_short_segments(min_chars=4)
+        assert result.segment_count == 1
+        assert len(result.segments[0].words) == 2
+        assert result.segments[0].words[0].text == "你"
+        assert result.segments[0].words[1].text == "好"
+
+    def test_trailing_short_merged_to_last(self):
+        """尾部极短段合并到最后一段."""
+        segs = [
+            SubtitleSegment(text="一二三四五六七八九十", start=0.0, end=1.0),
+            SubtitleSegment(text="尾", start=1.0, end=1.1),
+        ]
+        tl = SubtitleTimeline(segments=segs)
+        result = tl.merge_short_segments(min_chars=5)
+        # 第一段10字 >= 5 → 先入merged
+        # "尾" = 1字 < 5 → 进入buffer
+        # 循环结束，buffer非空，检查是否合并到最后一段
+        # merged[-1] = 10字 + 1字 = 11字 <= max_chars(这里没限制)
+        assert result.segment_count == 1
+        assert result.segments[0].text == "一二三四五六七八九十尾"
+
+
+# ── split_long_segments 更多边界 ──────────────────────────────────────
+
+
+class TestSplitLongSegmentsMore:
+    """split_long_segments 补充边界测试."""
+
+    def test_exactly_max_chars_no_split(self):
+        """恰好等于 max_chars 不拆分."""
+        text = "一二三四五六七八九十"  # 10字
+        seg = SubtitleSegment(text=text, start=0.0, end=5.0)
+        tl = SubtitleTimeline(segments=[seg])
+        result = tl.split_long_segments(max_chars=10)
+        assert result.segment_count == 1
+
+    def test_one_over_max_chars_splits(self):
+        """超过1个字符就拆分."""
+        text = "一二三四五六七八九十一"  # 11字
+        seg = SubtitleSegment(text=text, start=0.0, end=5.0)
+        tl = SubtitleTimeline(segments=[seg])
+        result = tl.split_long_segments(max_chars=10)
+        assert result.segment_count >= 2
+        assert result.total_chars == 11
+
+    def test_mixed_short_and_long_segments(self):
+        """长短片段混合，只拆分长的."""
+        segs = [
+            SubtitleSegment(text="短", start=0.0, end=0.5),
+            SubtitleSegment(text="很长很长很长的一段文字内容超过限制", start=0.5, end=3.0),
+            SubtitleSegment(text="也短", start=3.0, end=3.5),
+        ]
+        tl = SubtitleTimeline(segments=segs)
+        result = tl.split_long_segments(max_chars=10)
+        # 第1段和第3段保持，第2段被拆分
+        assert result.segment_count > 3
+        assert result.segments[0].text == "短"
+        assert result.segments[-1].text == "也短"
+
+    def test_total_chars_preserved_after_split(self):
+        """拆分后总字符数不变."""
+        text = "这是第一段。这是第二段很长的内容。还有第三段。"
+        seg = SubtitleSegment(text=text, start=0.0, end=10.0)
+        tl = SubtitleTimeline(segments=[seg])
+        result = tl.split_long_segments(max_chars=8)
+        assert result.total_chars == len(text)
+
+    def test_total_duration_preserved(self):
+        """拆分后最后一段的结束时间等于原始结束时间."""
+        text = "一二三四。五六七八。九十一二。"
+        seg = SubtitleSegment(text=text, start=1.0, end=5.0)
+        tl = SubtitleTimeline(segments=[seg])
+        result = tl.split_long_segments(max_chars=5)
+        assert abs(result.segments[-1].end - 5.0) < 0.01
+        assert abs(result.segments[0].start - 1.0) < 0.01
+
+
+# ── _split_text_by_punctuation 更多边界 ───────────────────────────────
+
+
+class TestSplitTextByPunctuationMore:
+    """_split_text_by_punctuation 补充边界测试."""
+
+    def test_comma_splits_when_over_max(self):
+        """逗号在超长时触发拆分."""
+        text = "一二三四五六七八，八七六五四三二一"
+        result = SubtitleTimeline._split_text_by_punctuation(text, 10)
+        assert len(result) >= 2
+        assert "，" in result[0]
+
+    def test_colon_semicolon_splits(self):
+        """冒号分号也能触发拆分."""
+        text = "首先：第一点内容；第二点内容更多一些。"
+        result = SubtitleTimeline._split_text_by_punctuation(text, 8)
+        assert len(result) >= 2
+
+    def test_punctuation_at_start(self):
+        """标点在开头位置."""
+        text = "。这是正文内容开始了"
+        result = SubtitleTimeline._split_text_by_punctuation(text, 10)
+        # 开头的句号在 max_chars//2 之前，不会触发句末标点拆分
+        # 但整个文本不长，可能不拆
+        assert len(result) >= 1
+
+    def test_consecutive_punctuation(self):
+        """连续多个标点符号."""
+        text = "你好！！！世界？？？"
+        result = SubtitleTimeline._split_text_by_punctuation(text, 5)
+        assert len(result) >= 1
+
+    def test_english_sentence_end(self):
+        """英文句末标点也触发拆分."""
+        text = "Hello world. This is a test sentence with enough words."
+        result = SubtitleTimeline._split_text_by_punctuation(text, 15)
+        assert len(result) >= 2
+
+    def test_no_punctuation_hard_cut_evenly(self):
+        """没有标点时均匀硬切."""
+        text = "一二三四五六七八九十一二三四五六七八九十一二三四五"  # 25字
+        result = SubtitleTimeline._split_text_by_punctuation(text, 10)
+        assert len(result) == 3
+        assert len(result[0]) == 10
+        assert len(result[1]) == 10
+        assert len(result[2]) == 5
+
+    def test_single_character_text(self):
+        """单字符文本."""
+        result = SubtitleTimeline._split_text_by_punctuation("好", 10)
+        assert result == ["好"]
+
+    def test_only_punctuation(self):
+        """只有标点符号."""
+        result = SubtitleTimeline._split_text_by_punctuation("。！？", 10)
+        assert len(result) == 1
+
+    def test_mixed_fullwidth_halfwidth_punctuation(self):
+        """全角半角标点混合."""
+        text = "你好。再见!谢谢？不用谢。"
+        result = SubtitleTimeline._split_text_by_punctuation(text, 5)
+        assert len(result) >= 2
diff --git a/tests/unit/test_voice_library_domain.py b/tests/unit/test_voice_library_domain.py
index 9ebe1b6e3..972a77582 100755
--- a/tests/unit/test_voice_library_domain.py
+++ b/tests/unit/test_voice_library_domain.py
@@ -93,3 +93,75 @@ class TestVoiceLibraryItem:
         item = VoiceLibraryItem(id="v1", user_id="u1", name="n")
         assert item.created_at is not None
         assert item.updated_at is not None
+
+
+# ── VoiceLibraryItem 更多边界测试 ──────────────────────────────────────
+
+
+class TestVoiceLibraryItemMore:
+    """VoiceLibraryItem 补充测试."""
+
+    def test_status_pending(self):
+        """pending状态."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", status="pending")
+        assert item.status == "pending"
+
+    def test_status_processing(self):
+        """processing状态."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", status="processing")
+        assert item.status == "processing"
+
+    def test_status_failed(self):
+        """failed状态."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", status="failed")
+        assert item.status == "failed"
+
+    def test_zero_duration_and_size(self):
+        """零时长零大小."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", duration=0, file_size=0)
+        assert item.duration == 0
+        assert item.file_size == 0
+
+    def test_large_duration_and_size(self):
+        """大时长大文件."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", duration=3600.0, file_size=1024 * 1024 * 100)
+        assert item.duration == 3600.0
+        assert item.file_size == 104857600
+
+    def test_empty_tags_list(self):
+        """空标签列表."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", tags=[])
+        assert item.tags == []
+
+    def test_many_tags(self):
+        """多个标签."""
+        tags = ["温柔", "女声", "情感", "治愈", "朗读", "故事"]
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", tags=tags)
+        assert len(item.tags) == 6
+        assert "治愈" in item.tags
+
+    def test_empty_metadata(self):
+        """空元数据."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n")
+        assert item.metadata_ == {}
+
+    def test_metadata_with_nested_values(self):
+        """嵌套元数据."""
+        meta = {
+            "settings": {"speed": 1.0, "pitch": 0.5},
+            "source": "upload",
+            "version": 2,
+        }
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", metadata_=meta)
+        assert item.metadata_["settings"]["speed"] == 1.0
+        assert item.metadata_["source"] == "upload"
+
+    def test_project_id_none_by_default(self):
+        """默认project_id为None."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n")
+        assert item.project_id is None
+
+    def test_project_id_set(self):
+        """设置project_id."""
+        item = VoiceLibraryItem(id="v1", user_id="u1", name="n", project_id="proj-abc-123")
+        assert item.project_id == "proj-abc-123"