diff --git a/tests/unit/test_feature_flags.py b/tests/unit/test_feature_flags.py
new file mode 100755
index 000000000..304f6313b
--- /dev/null
+++ b/tests/unit/test_feature_flags.py
@@ -0,0 +1,256 @@
+"""Feature Flags 单元测试"""
+
+from __future__ import annotations
+
+import pytest
+
+from packages.infrastructure.feature_flags import (
+    FeatureFlag,
+    FeatureFlags,
+    FeatureScope,
+)
+
+
+class TestFeatureFlag:
+    """单个 FeatureFlag 测试"""
+
+    def test_default_enabled(self):
+        """默认全局启用"""
+        flag = FeatureFlag(name="test_feature")
+        assert flag.is_enabled() is True
+
+    def test_global_disabled(self):
+        """全局禁用"""
+        flag = FeatureFlag(name="test_feature", global_enabled=False)
+        assert flag.is_enabled() is False
+
+    def test_plan_override_free_disabled(self):
+        """free 套餐被覆盖为禁用"""
+        flag = FeatureFlag(
+            name="test_feature", global_enabled=True, plan_overrides={"free": False}
+        )
+        assert flag.is_enabled(user_plan="free") is False
+        assert flag.is_enabled(user_plan="basic") is True
+        assert flag.is_enabled(user_plan="premium") is True
+
+    def test_plan_override_premium_only(self):
+        """仅 premium 可用"""
+        flag = FeatureFlag(
+            name="test_feature",
+            global_enabled=True,
+            plan_overrides={"free": False, "basic": False},
+        )
+        assert flag.is_enabled(user_plan="free") is False
+        assert flag.is_enabled(user_plan="basic") is False
+        assert flag.is_enabled(user_plan="premium") is True
+
+    def test_user_override_priority_higher_than_plan(self):
+        """用户白名单优先级高于套餐"""
+        flag = FeatureFlag(
+            name="test_feature",
+            global_enabled=False,
+            plan_overrides={"free": False},
+            user_overrides={"user_001": True},
+        )
+        # 用户在白名单中，即使全局禁用+free套餐也启用
+        assert flag.is_enabled(user_plan="free", user_id="user_001") is True
+
+    def test_user_override_disable(self):
+        """用户白名单可单独禁用"""
+        flag = FeatureFlag(
+            name="test_feature",
+            global_enabled=True,
+            user_overrides={"user_002": False},
+        )
+        assert flag.is_enabled(user_id="user_002") is False
+        assert flag.is_enabled(user_id="user_001") is True
+
+    def test_user_override_without_plan(self):
+        """用户白名单无需套餐也生效"""
+        flag = FeatureFlag(
+            name="test_feature", global_enabled=False, user_overrides={"u1": True}
+        )
+        assert flag.is_enabled(user_id="u1") is True
+        assert flag.is_enabled(user_id="u2") is False
+
+    def test_no_plan_uses_global(self):
+        """不传 user_plan 时回退到全局开关"""
+        flag = FeatureFlag(name="test", global_enabled=True, plan_overrides={"free": False})
+        assert flag.is_enabled() is True
+
+    def test_default_values(self):
+        """默认值正确"""
+        flag = FeatureFlag(name="test")
+        assert flag.name == "test"
+        assert flag.description == ""
+        assert flag.global_enabled is True
+        assert flag.plan_overrides == {}
+        assert flag.user_overrides == {}
+
+
+class TestFeatureFlags:
+    """FeatureFlags 管理器测试"""
+
+    def test_singleton_default_flags(self):
+        """默认有 5 个 feature flags"""
+        ff = FeatureFlags()
+        flags = ff.list_flags()
+        assert len(flags) == 5
+        assert FeatureScope.AI_VOICE_GENERATION in flags
+        assert FeatureScope.DEDUPLICATION_REPORT in flags
+        assert FeatureScope.BATCH_EXPORT in flags
+        assert FeatureScope.MULTI_PLATFORM_OUTPUT in flags
+        assert FeatureScope.RECIPE_REUSE in flags
+
+    def test_is_enabled_existing_flag(self):
+        """已存在的 flag 正常判断"""
+        ff = FeatureFlags()
+        assert ff.is_enabled(FeatureScope.AI_VOICE_GENERATION) is True
+
+    def test_is_enabled_nonexistent_flag(self):
+        """不存在的 flag 默认禁用"""
+        ff = FeatureFlags()
+        assert ff.is_enabled("nonexistent_flag") is False
+
+    def test_is_enabled_with_plan(self):
+        """按套餐判断"""
+        ff = FeatureFlags()
+        # free 套餐 AI 配音不可用
+        assert ff.is_enabled(FeatureScope.AI_VOICE_GENERATION, user_plan="free") is False
+        assert ff.is_enabled(FeatureScope.AI_VOICE_GENERATION, user_plan="basic") is True
+        assert ff.is_enabled(FeatureScope.AI_VOICE_GENERATION, user_plan="premium") is True
+
+    def test_is_enabled_premium_only_features(self):
+        """仅 premium 可用的功能"""
+        ff = FeatureFlags()
+        for feat in [FeatureScope.DEDUPLICATION_REPORT, FeatureScope.MULTI_PLATFORM_OUTPUT]:
+            assert ff.is_enabled(feat, user_plan="free") is False
+            assert ff.is_enabled(feat, user_plan="basic") is False
+            assert ff.is_enabled(feat, user_plan="premium") is True
+
+    def test_register_new_flag(self):
+        """注册新 flag"""
+        ff = FeatureFlags()
+        new_flag = FeatureFlag(name="new_feature", description="新功能", global_enabled=True)
+        ff.register(new_flag)
+
+        assert ff.is_enabled("new_feature") is True
+        assert ff.get("new_feature") is not None
+        assert ff.get("new_feature").description == "新功能"
+
+    def test_register_overwrites_existing(self):
+        """注册同名 flag 覆盖旧的"""
+        ff = FeatureFlags()
+        original = ff.get(FeatureScope.AI_VOICE_GENERATION)
+        assert original.global_enabled is True
+
+        new_flag = FeatureFlag(name=FeatureScope.AI_VOICE_GENERATION, global_enabled=False)
+        ff.register(new_flag)
+
+        assert ff.is_enabled(FeatureScope.AI_VOICE_GENERATION) is False
+
+    def test_get_returns_none_for_missing(self):
+        """获取不存在的 flag 返回 None"""
+        ff = FeatureFlags()
+        assert ff.get("no_such_flag") is None
+
+    def test_set_global(self):
+        """设置全局开关"""
+        ff = FeatureFlags()
+        ff.set_global(FeatureScope.BATCH_EXPORT, False)
+        assert ff.is_enabled(FeatureScope.BATCH_EXPORT) is False
+
+        ff.set_global(FeatureScope.BATCH_EXPORT, True)
+        assert ff.is_enabled(FeatureScope.BATCH_EXPORT) is True
+
+    def test_set_global_missing_raises(self):
+        """设置不存在的 flag 抛 KeyError"""
+        ff = FeatureFlags()
+        with pytest.raises(KeyError):
+            ff.set_global("nonexistent", True)
+
+    def test_set_plan_override(self):
+        """设置套餐级别覆盖"""
+        ff = FeatureFlags()
+        ff.set_plan_override(FeatureScope.BATCH_EXPORT, "basic", False)
+        assert ff.is_enabled(FeatureScope.BATCH_EXPORT, user_plan="basic") is False
+        assert ff.is_enabled(FeatureScope.BATCH_EXPORT, user_plan="premium") is True
+
+    def test_set_plan_override_missing_raises(self):
+        """设置不存在的 flag 抛 KeyError"""
+        ff = FeatureFlags()
+        with pytest.raises(KeyError):
+            ff.set_plan_override("nonexistent", "free", False)
+
+    def test_set_user_override(self):
+        """设置用户白名单"""
+        ff = FeatureFlags()
+        ff.set_user_override(FeatureScope.DEDUPLICATION_REPORT, "user_42", True)
+        assert ff.is_enabled(
+            FeatureScope.DEDUPLICATION_REPORT, user_plan="free", user_id="user_42"
+        ) is True
+
+    def test_set_user_override_disable(self):
+        """用户白名单禁用"""
+        ff = FeatureFlags()
+        ff.set_user_override(FeatureScope.AI_VOICE_GENERATION, "user_99", False)
+        assert ff.is_enabled(
+            FeatureScope.AI_VOICE_GENERATION, user_plan="premium", user_id="user_99"
+        ) is False
+
+    def test_set_user_override_missing_raises(self):
+        """设置不存在的 flag 抛 KeyError"""
+        ff = FeatureFlags()
+        with pytest.raises(KeyError):
+            ff.set_user_override("nonexistent", "u1", True)
+
+    def test_list_flags_returns_copy(self):
+        """list_flags 返回副本，修改不影响内部"""
+        ff = FeatureFlags()
+        flags = ff.list_flags()
+        flags["new_one"] = FeatureFlag(name="new_one")
+        assert ff.get("new_one") is None
+
+    def test_get_enabled_for_plan_free(self):
+        """获取 free 套餐下启用的功能"""
+        ff = FeatureFlags()
+        enabled = ff.get_enabled_for_plan("free")
+        # free 套餐只有 recipe_reuse 可用？不对，看看默认配置
+        # AI_VOICE_GENERATION: free=False
+        # DEDUPLICATION_REPORT: free=False, basic=False
+        # BATCH_EXPORT: free=False
+        # MULTI_PLATFORM_OUTPUT: free=False, basic=False
+        # RECIPE_REUSE: free=False
+        # 所以 free 套餐全部禁用？不，recipe_reuse free=False
+        # 等等，RECIPE_REUSE 的 plan_overrides 是 {"free": False}，
+        # 那对于 free 套餐，返回 False；但全局是 True
+        # 所以 free 套餐没有任何启用的？不对...
+        # 让我重新看：global_enabled=True，plan_overrides={"free": False}
+        # 那么 free 套餐 is_enabled 是 False，其他套餐是 True
+        # 所以 free 套餐应该 0 个启用？不对，等等...
+        # 不，我需要重新检查每个 flag 的 plan_overrides
+        # AI_VOICE_GENERATION: free=False → free: False, basic/premium: True
+        # DEDUPLICATION_REPORT: free=False, basic=False → free/basic: False, premium: True
+        # BATCH_EXPORT: free=False → free: False, basic/premium: True
+        # MULTI_PLATFORM_OUTPUT: free=False, basic=False → free/basic: False, premium: True
+        # RECIPE_REUSE: free=False → free: False, basic/premium: True
+        assert len(enabled) == 0
+
+    def test_get_enabled_for_plan_basic(self):
+        """获取 basic 套餐下启用的功能"""
+        ff = FeatureFlags()
+        enabled = ff.get_enabled_for_plan("basic")
+        # basic 套餐：AI_VOICE、BATCH_EXPORT、RECIPE_REUSE 可用
+        # DEDUPLICATION_REPORT、MULTI_PLATFORM_OUTPUT 不可用
+        assert FeatureScope.AI_VOICE_GENERATION in enabled
+        assert FeatureScope.BATCH_EXPORT in enabled
+        assert FeatureScope.RECIPE_REUSE in enabled
+        assert FeatureScope.DEDUPLICATION_REPORT not in enabled
+        assert FeatureScope.MULTI_PLATFORM_OUTPUT not in enabled
+        assert len(enabled) == 3
+
+    def test_get_enabled_for_plan_premium(self):
+        """获取 premium 套餐下所有功能都启用"""
+        ff = FeatureFlags()
+        enabled = ff.get_enabled_for_plan("premium")
+        assert len(enabled) == 5
diff --git a/tests/unit/test_tts_job_use_cases.py b/tests/unit/test_tts_job_use_cases.py
new file mode 100755
index 000000000..1c6b8c6ff
--- /dev/null
+++ b/tests/unit/test_tts_job_use_cases.py
@@ -0,0 +1,253 @@
+"""TTS Job Use Cases 单元测试"""
+
+from __future__ import annotations
+
+import pytest
+from unittest.mock import MagicMock
+
+from packages.application.tts_job.use_cases import (
+    CreateTTSJobUseCase,
+    ListTTSJobsUseCase,
+    GetTTSJobUseCase,
+    GetTTSJobStatusUseCase,
+    DeleteTTSJobUseCase,
+)
+from packages.application.tts_job.exceptions import TTSJobNotFoundError
+from packages.domain.tts_job import TTSJob, TTSJobStatus
+
+
+@pytest.fixture
+def mock_repo():
+    return MagicMock()
+
+
+@pytest.fixture
+def sample_job():
+    return TTSJob.create(
+        user_id="user_001",
+        input_text="测试文本",
+        voice_id="voice_001",
+        voice_model="cosyvoice",
+        project_id="proj_001",
+        sample_rate=22050,
+        format="mp3",
+        max_retries=3,
+    )
+
+
+class TestCreateTTSJobUseCase:
+    """创建 TTS 任务用例测试"""
+
+    def test_create_success(self, mock_repo, sample_job):
+        """创建成功"""
+        mock_repo.create.return_value = sample_job
+
+        use_case = CreateTTSJobUseCase(mock_repo)
+        result = use_case.execute(
+            user_id="user_001",
+            input_text="测试文本",
+            voice_id="voice_001",
+            voice_model="cosyvoice",
+            project_id="proj_001",
+        )
+
+        assert result is not None
+        assert result.user_id == "user_001"
+        assert result.input_text == "测试文本"
+        assert result.status == TTSJobStatus.PENDING
+        mock_repo.create.assert_called_once()
+
+    def test_create_with_default_params(self, mock_repo):
+        """使用默认参数创建"""
+        mock_repo.create.side_effect = lambda x: x
+
+        use_case = CreateTTSJobUseCase(mock_repo)
+        result = use_case.execute(user_id="user_001", input_text="hello")
+
+        assert result.voice_id == ""
+        assert result.voice_model == ""
+        assert result.sample_rate == 22050
+        assert result.format == "mp3"
+        assert result.max_retries == 3
+
+    def test_create_with_metadata(self, mock_repo):
+        """创建时携带 metadata"""
+        mock_repo.create.side_effect = lambda x: x
+
+        use_case = CreateTTSJobUseCase(mock_repo)
+        result = use_case.execute(
+            user_id="user_001",
+            input_text="test",
+            metadata={"source": "api", "priority": "high"},
+        )
+
+        assert result.metadata["source"] == "api"
+        assert result.metadata["priority"] == "high"
+
+    def test_create_with_voice_clone_profile(self, mock_repo):
+        """使用音色克隆档案创建"""
+        mock_repo.create.side_effect = lambda x: x
+
+        use_case = CreateTTSJobUseCase(mock_repo)
+        result = use_case.execute(
+            user_id="user_001",
+            input_text="test",
+            voice_clone_profile_id="clone_001",
+        )
+
+        assert result.voice_clone_profile_id == "clone_001"
+
+
+class TestListTTSJobsUseCase:
+    """列出 TTS 任务用例测试"""
+
+    def test_list_success(self, mock_repo, sample_job):
+        """列出任务成功"""
+        mock_repo.list_by_user.return_value = [sample_job]
+        mock_repo.count_by_user.return_value = 1
+
+        use_case = ListTTSJobsUseCase(mock_repo)
+        items, total = use_case.execute(user_id="user_001")
+
+        assert len(items) == 1
+        assert total == 1
+        mock_repo.list_by_user.assert_called_once_with(
+            "user_001", status=None, limit=50, offset=0
+        )
+
+    def test_list_with_status_filter(self, mock_repo):
+        """按状态过滤"""
+        mock_repo.list_by_user.return_value = []
+        mock_repo.count_by_user.return_value = 0
+
+        use_case = ListTTSJobsUseCase(mock_repo)
+        items, total = use_case.execute(user_id="user_001", status="completed")
+
+        assert total == 0
+        mock_repo.list_by_user.assert_called_once_with(
+            "user_001", status="completed", limit=50, offset=0
+        )
+        mock_repo.count_by_user.assert_called_once_with(
+            "user_001", status="completed"
+        )
+
+    def test_list_with_pagination(self, mock_repo):
+        """分页参数正确传递"""
+        mock_repo.list_by_user.return_value = []
+        mock_repo.count_by_user.return_value = 0
+
+        use_case = ListTTSJobsUseCase(mock_repo)
+        use_case.execute(user_id="user_001", skip=10, limit=20)
+
+        mock_repo.list_by_user.assert_called_once_with(
+            "user_001", status=None, limit=20, offset=10
+        )
+
+    def test_list_empty(self, mock_repo):
+        """空列表"""
+        mock_repo.list_by_user.return_value = []
+        mock_repo.count_by_user.return_value = 0
+
+        use_case = ListTTSJobsUseCase(mock_repo)
+        items, total = use_case.execute(user_id="user_001")
+
+        assert items == []
+        assert total == 0
+
+
+class TestGetTTSJobUseCase:
+    """获取 TTS 任务详情用例测试"""
+
+    def test_get_success(self, mock_repo, sample_job):
+        """获取成功"""
+        mock_repo.get.return_value = sample_job
+
+        use_case = GetTTSJobUseCase(mock_repo)
+        result = use_case.execute(job_id=sample_job.id, user_id="user_001")
+
+        assert result.id == sample_job.id
+        mock_repo.get.assert_called_once_with(sample_job.id)
+
+    def test_get_not_found(self, mock_repo):
+        """任务不存在"""
+        mock_repo.get.return_value = None
+
+        use_case = GetTTSJobUseCase(mock_repo)
+
+        with pytest.raises(TTSJobNotFoundError):
+            use_case.execute(job_id="nonexistent", user_id="user_001")
+
+    def test_get_wrong_user(self, mock_repo, sample_job):
+        """用户不匹配"""
+        mock_repo.get.return_value = sample_job  # user_001
+
+        use_case = GetTTSJobUseCase(mock_repo)
+
+        with pytest.raises(TTSJobNotFoundError):
+            use_case.execute(job_id=sample_job.id, user_id="other_user")
+
+
+class TestGetTTSJobStatusUseCase:
+    """查询 TTS 任务状态用例测试"""
+
+    def test_get_status_success(self, mock_repo, sample_job):
+        """获取状态成功"""
+        mock_repo.get.return_value = sample_job
+
+        use_case = GetTTSJobStatusUseCase(mock_repo)
+        result = use_case.execute(job_id=sample_job.id, user_id="user_001")
+
+        assert result.status == TTSJobStatus.PENDING
+
+    def test_get_status_not_found(self, mock_repo):
+        """任务不存在抛异常"""
+        mock_repo.get.return_value = None
+
+        use_case = GetTTSJobStatusUseCase(mock_repo)
+
+        with pytest.raises(TTSJobNotFoundError):
+            use_case.execute(job_id="nonexistent", user_id="user_001")
+
+    def test_get_status_wrong_user(self, mock_repo, sample_job):
+        """用户不匹配抛异常"""
+        mock_repo.get.return_value = sample_job
+
+        use_case = GetTTSJobStatusUseCase(mock_repo)
+
+        with pytest.raises(TTSJobNotFoundError):
+            use_case.execute(job_id=sample_job.id, user_id="other_user")
+
+
+class TestDeleteTTSJobUseCase:
+    """删除 TTS 任务用例测试"""
+
+    def test_delete_success(self, mock_repo, sample_job):
+        """删除成功"""
+        mock_repo.get.return_value = sample_job
+        mock_repo.delete.return_value = True
+
+        use_case = DeleteTTSJobUseCase(mock_repo)
+        result = use_case.execute(job_id=sample_job.id, user_id="user_001")
+
+        assert result is True
+        mock_repo.delete.assert_called_once_with(sample_job.id)
+
+    def test_delete_not_found(self, mock_repo):
+        """任务不存在返回 False"""
+        mock_repo.get.return_value = None
+
+        use_case = DeleteTTSJobUseCase(mock_repo)
+        result = use_case.execute(job_id="nonexistent", user_id="user_001")
+
+        assert result is False
+        mock_repo.delete.assert_not_called()
+
+    def test_delete_wrong_user(self, mock_repo, sample_job):
+        """用户不匹配返回 False"""
+        mock_repo.get.return_value = sample_job
+
+        use_case = DeleteTTSJobUseCase(mock_repo)
+        result = use_case.execute(job_id=sample_job.id, user_id="other_user")
+
+        assert result is False
+        mock_repo.delete.assert_not_called()
diff --git a/tests/unit/test_voice_clone_use_cases.py b/tests/unit/test_voice_clone_use_cases.py
new file mode 100755
index 000000000..736929bb7
--- /dev/null
+++ b/tests/unit/test_voice_clone_use_cases.py
@@ -0,0 +1,328 @@
+"""Voice Clone Use Cases 单元测试"""
+
+from __future__ import annotations
+
+import pytest
+from unittest.mock import MagicMock
+
+from packages.application.voice_clone.use_cases import (
+    CreateVoiceCloneUseCase,
+    ListVoiceClonesUseCase,
+    GetVoiceCloneUseCase,
+    GetVoiceCloneStatusUseCase,
+    DeleteVoiceCloneUseCase,
+    RetryVoiceCloneUseCase,
+    VoiceCloneNotFoundError,
+    VoiceCloneNotRetryableError,
+)
+from packages.domain.voice_clone_profile import VoiceCloneProfile, VoiceCloneStatus
+
+
+@pytest.fixture
+def mock_repo():
+    return MagicMock()
+
+
+@pytest.fixture
+def sample_profile():
+    return VoiceCloneProfile.create(
+        user_id="user_001",
+        name="我的音色",
+        description="测试音色克隆",
+        source_audio_url="https://example.com/audio.wav",
+        voice_model="cosyvoice",
+        language="zh-CN",
+        gender="female",
+        max_retries=3,
+    )
+
+
+class TestCreateVoiceCloneUseCase:
+    """创建音色克隆用例测试"""
+
+    def test_create_success(self, mock_repo, sample_profile):
+        """创建成功"""
+        mock_repo.create.return_value = sample_profile
+
+        use_case = CreateVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(
+            user_id="user_001",
+            name="我的音色",
+            source_audio_url="https://example.com/audio.wav",
+        )
+
+        assert result is not None
+        assert result.user_id == "user_001"
+        assert result.name == "我的音色"
+        assert result.status == VoiceCloneStatus.PENDING
+        mock_repo.create.assert_called_once()
+
+    def test_create_with_default_params(self, mock_repo):
+        """使用默认参数创建"""
+        mock_repo.create.side_effect = lambda x: x
+
+        use_case = CreateVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(user_id="user_001", name="测试音色")
+
+        assert result.description == ""
+        assert result.source_audio_url == ""
+        assert result.voice_model == ""
+        assert result.language == "zh-CN"
+        assert result.gender == "unknown"
+        assert result.max_retries == 3
+
+    def test_create_with_metadata(self, mock_repo):
+        """创建时携带 metadata"""
+        mock_repo.create.side_effect = lambda x: x
+
+        use_case = CreateVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(
+            user_id="user_001",
+            name="test",
+            metadata={"source": "upload", "duration": 10},
+        )
+
+        assert result.metadata["source"] == "upload"
+        assert result.metadata["duration"] == 10
+
+    def test_create_custom_max_retries(self, mock_repo):
+        """自定义重试次数"""
+        mock_repo.create.side_effect = lambda x: x
+
+        use_case = CreateVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(
+            user_id="user_001", name="test", max_retries=5
+        )
+
+        assert result.max_retries == 5
+
+
+class TestListVoiceClonesUseCase:
+    """列出音色克隆用例测试"""
+
+    def test_list_success(self, mock_repo, sample_profile):
+        """列出成功"""
+        mock_repo.list_by_user.return_value = [sample_profile]
+        mock_repo.count_by_user.return_value = 1
+
+        use_case = ListVoiceClonesUseCase(mock_repo)
+        items, total = use_case.execute(user_id="user_001")
+
+        assert len(items) == 1
+        assert total == 1
+        mock_repo.list_by_user.assert_called_once_with(
+            "user_001", status=None, limit=50, offset=0
+        )
+
+    def test_list_with_status_filter(self, mock_repo):
+        """按状态过滤"""
+        mock_repo.list_by_user.return_value = []
+        mock_repo.count_by_user.return_value = 0
+
+        use_case = ListVoiceClonesUseCase(mock_repo)
+        items, total = use_case.execute(user_id="user_001", status="completed")
+
+        assert total == 0
+        mock_repo.list_by_user.assert_called_once_with(
+            "user_001", status="completed", limit=50, offset=0
+        )
+
+    def test_list_with_pagination(self, mock_repo):
+        """分页参数正确传递"""
+        mock_repo.list_by_user.return_value = []
+        mock_repo.count_by_user.return_value = 0
+
+        use_case = ListVoiceClonesUseCase(mock_repo)
+        use_case.execute(user_id="user_001", skip=20, limit=10)
+
+        mock_repo.list_by_user.assert_called_once_with(
+            "user_001", status=None, limit=10, offset=20
+        )
+
+    def test_list_empty(self, mock_repo):
+        """空列表"""
+        mock_repo.list_by_user.return_value = []
+        mock_repo.count_by_user.return_value = 0
+
+        use_case = ListVoiceClonesUseCase(mock_repo)
+        items, total = use_case.execute(user_id="user_001")
+
+        assert items == []
+        assert total == 0
+
+
+class TestGetVoiceCloneUseCase:
+    """获取音色克隆详情用例测试"""
+
+    def test_get_success(self, mock_repo, sample_profile):
+        """获取成功"""
+        mock_repo.get.return_value = sample_profile
+
+        use_case = GetVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+        assert result.id == sample_profile.id
+        mock_repo.get.assert_called_once_with(sample_profile.id)
+
+    def test_get_not_found(self, mock_repo):
+        """不存在抛异常"""
+        mock_repo.get.return_value = None
+
+        use_case = GetVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotFoundError):
+            use_case.execute(clone_id="nonexistent", user_id="user_001")
+
+    def test_get_wrong_user(self, mock_repo, sample_profile):
+        """用户不匹配抛异常"""
+        mock_repo.get.return_value = sample_profile
+
+        use_case = GetVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotFoundError):
+            use_case.execute(clone_id=sample_profile.id, user_id="other_user")
+
+
+class TestGetVoiceCloneStatusUseCase:
+    """查询音色克隆状态用例测试"""
+
+    def test_get_status_success(self, mock_repo, sample_profile):
+        """获取状态成功"""
+        mock_repo.get.return_value = sample_profile
+
+        use_case = GetVoiceCloneStatusUseCase(mock_repo)
+        result = use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+        assert result.status == VoiceCloneStatus.PENDING
+
+    def test_get_status_not_found(self, mock_repo):
+        """不存在抛异常"""
+        mock_repo.get.return_value = None
+
+        use_case = GetVoiceCloneStatusUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotFoundError):
+            use_case.execute(clone_id="nonexistent", user_id="user_001")
+
+    def test_get_status_wrong_user(self, mock_repo, sample_profile):
+        """用户不匹配抛异常"""
+        mock_repo.get.return_value = sample_profile
+
+        use_case = GetVoiceCloneStatusUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotFoundError):
+            use_case.execute(clone_id=sample_profile.id, user_id="other_user")
+
+
+class TestDeleteVoiceCloneUseCase:
+    """删除音色克隆用例测试"""
+
+    def test_delete_success(self, mock_repo, sample_profile):
+        """删除成功"""
+        mock_repo.get.return_value = sample_profile
+        mock_repo.delete.return_value = True
+
+        use_case = DeleteVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+        assert result is True
+        mock_repo.delete.assert_called_once_with(sample_profile.id)
+
+    def test_delete_not_found(self, mock_repo):
+        """不存在返回 False"""
+        mock_repo.get.return_value = None
+
+        use_case = DeleteVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(clone_id="nonexistent", user_id="user_001")
+
+        assert result is False
+        mock_repo.delete.assert_not_called()
+
+    def test_delete_wrong_user(self, mock_repo, sample_profile):
+        """用户不匹配返回 False"""
+        mock_repo.get.return_value = sample_profile
+
+        use_case = DeleteVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(clone_id=sample_profile.id, user_id="other_user")
+
+        assert result is False
+        mock_repo.delete.assert_not_called()
+
+
+class TestRetryVoiceCloneUseCase:
+    """重试音色克隆用例测试"""
+
+    def test_retry_success(self, mock_repo, sample_profile):
+        """失败状态重试成功"""
+        sample_profile.status = VoiceCloneStatus.FAILED
+        sample_profile.retry_count = 1
+        mock_repo.get.return_value = sample_profile
+        mock_repo.update.side_effect = lambda x: x
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+        result = use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+        assert result.status == VoiceCloneStatus.PENDING
+        assert result.retry_count == 2
+        mock_repo.update.assert_called_once()
+
+    def test_retry_not_found(self, mock_repo):
+        """不存在抛异常"""
+        mock_repo.get.return_value = None
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotFoundError):
+            use_case.execute(clone_id="nonexistent", user_id="user_001")
+
+    def test_retry_wrong_user(self, mock_repo, sample_profile):
+        """用户不匹配抛异常"""
+        sample_profile.status = VoiceCloneStatus.FAILED
+        mock_repo.get.return_value = sample_profile
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotFoundError):
+            use_case.execute(clone_id=sample_profile.id, user_id="other_user")
+
+    def test_retry_not_retryable_pending(self, mock_repo, sample_profile):
+        """pending 状态不可重试"""
+        sample_profile.status = VoiceCloneStatus.PENDING
+        mock_repo.get.return_value = sample_profile
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotRetryableError):
+            use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+    def test_retry_not_retryable_processing(self, mock_repo, sample_profile):
+        """processing 状态不可重试"""
+        sample_profile.status = VoiceCloneStatus.PROCESSING
+        mock_repo.get.return_value = sample_profile
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotRetryableError):
+            use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+    def test_retry_not_retryable_ready(self, mock_repo, sample_profile):
+        """ready 状态不可重试"""
+        sample_profile.status = VoiceCloneStatus.READY
+        mock_repo.get.return_value = sample_profile
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotRetryableError):
+            use_case.execute(clone_id=sample_profile.id, user_id="user_001")
+
+    def test_retry_max_retries_exceeded(self, mock_repo, sample_profile):
+        """超过重试上限不可重试"""
+        sample_profile.status = VoiceCloneStatus.FAILED
+        sample_profile.retry_count = 3
+        sample_profile.max_retries = 3
+        mock_repo.get.return_value = sample_profile
+
+        use_case = RetryVoiceCloneUseCase(mock_repo)
+
+        with pytest.raises(VoiceCloneNotRetryableError):
+            use_case.execute(clone_id=sample_profile.id, user_id="user_001")