diff --git a/tests/unit/test_transition_presets_domain.py b/tests/unit/test_transition_presets_domain.py
new file mode 100755
index 000000000..546ff43b9
--- /dev/null
+++ b/tests/unit/test_transition_presets_domain.py
@@ -0,0 +1,180 @@
+"""transition_presets 模块单元测试."""
+
+import pytest
+
+from domain.transition_presets import (
+    TRANSITION_PRESET_LIBRARY,
+    TransitionPreset,
+    get_default_transition,
+    get_transition_preset,
+    list_transition_presets,
+)
+
+
+class TestTransitionPreset:
+    """TransitionPreset 数据类测试."""
+
+    def test_create_required_fields(self):
+        t = TransitionPreset(id="test_001", name="测试转场", category="basic")
+        assert t.id == "test_001"
+        assert t.name == "测试转场"
+        assert t.category == "basic"
+        # 默认值
+        assert t.description == ""
+        assert t.tags == []
+        assert t.transition == "fade"
+        assert t.default_duration == 0.5
+        assert t.min_duration == 0.1
+        assert t.max_duration == 3.0
+        assert t.has_custom_params is False
+
+    def test_create_all_fields(self):
+        t = TransitionPreset(
+            id="test_002",
+            name="完整转场",
+            category="slide",
+            description="测试描述",
+            tags=["标签1", "标签2"],
+            transition="slideleft",
+            default_duration=1.0,
+            min_duration=0.3,
+            max_duration=2.5,
+            has_custom_params=True,
+        )
+        assert t.category == "slide"
+        assert t.description == "测试描述"
+        assert t.tags == ["标签1", "标签2"]
+        assert t.transition == "slideleft"
+        assert t.default_duration == 1.0
+        assert t.min_duration == 0.3
+        assert t.max_duration == 2.5
+        assert t.has_custom_params is True
+
+    def test_frozen_immutable(self):
+        t = TransitionPreset(id="test", name="测试", category="basic")
+        with pytest.raises(Exception):
+            t.name = "修改"  # type: ignore[misc]
+
+    def test_tags_default_new_list(self):
+        t1 = TransitionPreset(id="1", name="a", category="basic")
+        t2 = TransitionPreset(id="2", name="b", category="basic")
+        assert t1.tags is not t2.tags
+        assert t1.tags == []
+
+
+class TestTransitionPresetLibrary:
+    """TRANSITION_PRESET_LIBRARY 预设库测试."""
+
+    def test_not_empty(self):
+        assert len(TRANSITION_PRESET_LIBRARY) > 0
+
+    def test_all_unique_ids(self):
+        ids = [t.id for t in TRANSITION_PRESET_LIBRARY]
+        assert len(ids) == len(set(ids)), "转场 ID 不能重复"
+
+    def test_all_are_transition_preset_instances(self):
+        for t in TRANSITION_PRESET_LIBRARY:
+            assert isinstance(t, TransitionPreset)
+
+    def test_contains_basic_categories(self):
+        cats = {t.category for t in TRANSITION_PRESET_LIBRARY}
+        assert "basic" in cats
+        assert "fade" in cats
+
+    def test_duration_constraints_valid(self):
+        """每个预设的 min <= default <= max."""
+        for t in TRANSITION_PRESET_LIBRARY:
+            assert t.min_duration <= t.default_duration, f"{t.id}: min > default"
+            assert t.default_duration <= t.max_duration, f"{t.id}: default > max"
+
+    def test_none_transition_zero_duration(self):
+        t = get_transition_preset("transition_none")
+        assert t is not None
+        assert t.default_duration == 0.0
+        assert t.min_duration == 0.0
+        assert t.max_duration == 0.0
+
+
+class TestGetTransitionPreset:
+    """get_transition_preset 函数测试."""
+
+    def test_existing_id(self):
+        t = get_transition_preset("transition_fade")
+        assert t is not None
+        assert t.id == "transition_fade"
+        assert t.name == "淡入淡出"
+        assert t.category == "fade"
+
+    def test_nonexistent_id(self):
+        assert get_transition_preset("nonexistent") is None
+
+    def test_empty_string(self):
+        assert get_transition_preset("") is None
+
+
+class TestListTransitionPresets:
+    """list_transition_presets 函数测试."""
+
+    def test_no_filters_returns_all(self):
+        result = list_transition_presets()
+        assert len(result) == len(TRANSITION_PRESET_LIBRARY)
+
+    def test_filter_by_category_basic(self):
+        result = list_transition_presets(category="basic")
+        assert len(result) >= 2
+        for t in result:
+            assert t.category == "basic"
+
+    def test_filter_by_category_fade(self):
+        result = list_transition_presets(category="fade")
+        assert len(result) >= 3
+        for t in result:
+            assert t.category == "fade"
+
+    def test_filter_by_unknown_category_returns_empty(self):
+        result = list_transition_presets(category="nonexistent")
+        assert result == []
+
+    def test_filter_by_keyword_name(self):
+        result = list_transition_presets(keyword="淡入")
+        assert len(result) >= 1
+        assert any(t.name == "淡入淡出" for t in result)
+
+    def test_filter_by_keyword_description(self):
+        result = list_transition_presets(keyword="经典")
+        assert len(result) >= 1
+
+    def test_filter_by_keyword_tag(self):
+        result = list_transition_presets(keyword="电影感")
+        assert len(result) >= 1
+
+    def test_filter_keyword_case_insensitive(self):
+        r1 = list_transition_presets(keyword="FADE")
+        r2 = list_transition_presets(keyword="fade")
+        assert len(r1) == len(r2)
+
+    def test_filter_keyword_no_match(self):
+        result = list_transition_presets(keyword="xyz_nonexistent_12345")
+        assert result == []
+
+    def test_combined_category_and_keyword(self):
+        result = list_transition_presets(category="fade", keyword="黑场")
+        assert len(result) >= 1
+        for t in result:
+            assert t.category == "fade"
+
+    def test_combined_no_match(self):
+        result = list_transition_presets(category="basic", keyword="黑场")
+        assert result == []
+
+
+class TestGetDefaultTransition:
+    """get_default_transition 函数测试."""
+
+    def test_returns_none_transition(self):
+        t = get_default_transition()
+        assert t.id == "transition_none"
+        assert t.name == "无转场"
+
+    def test_returns_transition_preset_instance(self):
+        assert isinstance(get_default_transition(), TransitionPreset)
diff --git a/tests/unit/test_tts_job_domain.py b/tests/unit/test_tts_job_domain.py
new file mode 100755
index 000000000..2d087cc49
--- /dev/null
+++ b/tests/unit/test_tts_job_domain.py
@@ -0,0 +1,394 @@
+"""tts_job 领域模型单元测试."""
+
+import pytest
+
+from domain.tts_job import TERMINAL_STATUSES, TTSJob, TTSJobStatus
+
+
+class TestTTSJobStatus:
+    """TTSJobStatus 枚举测试."""
+
+    def test_values(self):
+        assert TTSJobStatus.PENDING == "pending"
+        assert TTSJobStatus.PROCESSING == "processing"
+        assert TTSJobStatus.COMPLETED == "completed"
+        assert TTSJobStatus.FAILED == "failed"
+        assert TTSJobStatus.CANCELLED == "cancelled"
+
+    def test_terminal_statuses(self):
+        assert TTSJobStatus.COMPLETED in TERMINAL_STATUSES
+        assert TTSJobStatus.FAILED in TERMINAL_STATUSES
+        assert TTSJobStatus.CANCELLED in TERMINAL_STATUSES
+        assert TTSJobStatus.PENDING not in TERMINAL_STATUSES
+        assert TTSJobStatus.PROCESSING not in TERMINAL_STATUSES
+
+
+class TestTTSJobCreate:
+    """TTSJob.create 工厂方法测试."""
+
+    def test_create_with_required_fields(self):
+        job = TTSJob.create(user_id="user_001", input_text="你好世界")
+        assert job.id
+        assert len(job.id) == 32
+        assert job.user_id == "user_001"
+        assert job.input_text == "你好世界"
+        assert job.status == TTSJobStatus.PENDING
+        assert job.voice_id == ""
+        assert job.sample_rate == 22050
+        assert job.format == "mp3"
+        assert job.retry_count == 0
+        assert job.max_retries == 3
+        assert job.metadata == {}
+        assert job.created_at is not None
+        assert job.updated_at is not None
+
+    def test_create_with_all_fields(self):
+        job = TTSJob.create(
+            user_id="user_002",
+            input_text="测试文本",
+            voice_id="voice_001",
+            voice_model="cosyvoice",
+            project_id="proj_001",
+            voice_clone_profile_id="clone_001",
+            sample_rate=16000,
+            format="wav",
+            max_retries=5,
+            metadata={"key": "value"},
+        )
+        assert job.voice_id == "voice_001"
+        assert job.voice_model == "cosyvoice"
+        assert job.project_id == "proj_001"
+        assert job.voice_clone_profile_id == "clone_001"
+        assert job.sample_rate == 16000
+        assert job.format == "wav"
+        assert job.max_retries == 5
+        assert job.metadata == {"key": "value"}
+
+    def test_create_strips_strings(self):
+        job = TTSJob.create(
+            user_id="  user_003  ",
+            input_text="  测试文本  ",
+            voice_id="  voice_001  ",
+            voice_model="  cosyvoice  ",
+            project_id="  proj_001  ",
+            voice_clone_profile_id="  clone_001  ",
+            format="wav",
+        )
+        assert job.user_id == "user_003"
+        assert job.input_text == "测试文本"
+        assert job.voice_id == "voice_001"
+        assert job.voice_model == "cosyvoice"
+        assert job.project_id == "proj_001"
+        assert job.voice_clone_profile_id == "clone_001"
+        assert job.format == "wav"
+
+    def test_create_empty_user_id_raises(self):
+        with pytest.raises(ValueError, match="user_id"):
+            TTSJob.create(user_id="", input_text="test")
+
+    def test_create_whitespace_user_id_raises(self):
+        with pytest.raises(ValueError, match="user_id"):
+            TTSJob.create(user_id="   ", input_text="test")
+
+    def test_create_empty_input_text_raises(self):
+        with pytest.raises(ValueError, match="input_text"):
+            TTSJob.create(user_id="u", input_text="")
+
+    def test_create_input_text_too_long_raises(self):
+        long_text = "a" * 10001
+        with pytest.raises(ValueError, match="10000"):
+            TTSJob.create(user_id="u", input_text=long_text)
+
+    def test_create_input_text_at_limit_ok(self):
+        text = "a" * 10000
+        job = TTSJob.create(user_id="u", input_text=text)
+        assert job.input_text == text
+
+    def test_create_invalid_format_raises(self):
+        with pytest.raises(ValueError, match="不支持的输出格式"):
+            TTSJob.create(user_id="u", input_text="t", format="flac")
+
+    def test_create_supported_formats(self):
+        for fmt in ["mp3", "wav", "pcm"]:
+            job = TTSJob.create(user_id="u", input_text="t", format=fmt)
+            assert job.format == fmt
+
+    def test_create_none_metadata_defaults_to_empty_dict(self):
+        job = TTSJob.create(user_id="u", input_text="t", metadata=None)
+        assert job.metadata == {}
+
+    def test_create_ids_are_unique(self):
+        j1 = TTSJob.create(user_id="u", input_text="t")
+        j2 = TTSJob.create(user_id="u", input_text="t")
+        assert j1.id != j2.id
+
+
+class TestTTSJobStateMachine:
+    """TTSJob 状态机测试."""
+
+    @pytest.fixture
+    def pending_job(self):
+        return TTSJob.create(user_id="user_001", input_text="测试")
+
+    def test_initial_status_is_pending(self, pending_job):
+        assert pending_job.status == TTSJobStatus.PENDING
+        assert not pending_job.is_terminal
+
+    def test_pending_to_processing(self, pending_job):
+        pending_job.mark_processing()
+        assert pending_job.status == TTSJobStatus.PROCESSING
+        assert pending_job.started_at is not None
+        assert pending_job.error_message == ""
+
+    def test_pending_can_fail_directly(self, pending_job):
+        """pending 可以直接到 failed（比如入参校验失败）"""
+        pending_job.mark_failed("校验失败")
+        assert pending_job.status == TTSJobStatus.FAILED
+        assert pending_job.error_message == "校验失败"
+
+    def test_pending_can_be_cancelled(self, pending_job):
+        pending_job.mark_cancelled()
+        assert pending_job.status == TTSJobStatus.CANCELLED
+
+    def test_processing_to_completed(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_completed(output_audio_url="https://example.com/out.mp3")
+        assert pending_job.status == TTSJobStatus.COMPLETED
+        assert pending_job.output_audio_url == "https://example.com/out.mp3"
+        assert pending_job.completed_at is not None
+        assert pending_job.error_message == ""
+
+    def test_processing_to_failed(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_failed("API 超时")
+        assert pending_job.status == TTSJobStatus.FAILED
+        assert pending_job.error_message == "API 超时"
+
+    def test_processing_can_be_cancelled(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_cancelled()
+        assert pending_job.status == TTSJobStatus.CANCELLED
+
+    def test_completed_is_terminal(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_completed(output_audio_url="https://example.com/out.mp3")
+        assert pending_job.is_terminal
+        assert pending_job.is_completed
+
+    def test_failed_is_terminal_but_retryable(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_failed("error")
+        assert pending_job.is_terminal
+        assert pending_job.is_retryable
+
+    def test_cancelled_is_terminal_and_not_retryable(self, pending_job):
+        pending_job.mark_cancelled()
+        assert pending_job.is_terminal
+        assert not pending_job.is_retryable
+
+    def test_invalid_transition_completed_to_processing_raises(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_completed(output_audio_url="https://example.com/out.mp3")
+        with pytest.raises(ValueError, match="非法状态转换"):
+            pending_job.mark_processing()
+
+    def test_invalid_transition_completed_to_failed_raises(self, pending_job):
+        pending_job.mark_processing()
+        pending_job.mark_completed(output_audio_url="https://example.com/out.mp3")
+        with pytest.raises(ValueError, match="非法状态转换"):
+            pending_job.mark_failed("test")
+
+    def test_cancelled_cannot_transition(self, pending_job):
+        pending_job.mark_cancelled()
+        with pytest.raises(ValueError):
+            pending_job.mark_processing()
+        with pytest.raises(ValueError):
+            pending_job.mark_failed("test")
+
+    def test_transition_to_with_string(self, pending_job):
+        """transition_to 支持字符串参数"""
+        pending_job.transition_to("processing")
+        assert pending_job.status == TTSJobStatus.PROCESSING
+
+    def test_transition_to_invalid_string_raises(self, pending_job):
+        with pytest.raises(ValueError, match="无效状态"):
+            pending_job.transition_to("invalid_status")
+
+    def test_state_transition_updates_updated_at(self, pending_job):
+        old_updated = pending_job.updated_at
+        import time
+
+        time.sleep(0.001)
+        pending_job.mark_processing()
+        assert pending_job.updated_at > old_updated
+
+
+class TestTTSJobRetry:
+    """TTSJob 重试逻辑测试."""
+
+    def test_failed_can_retry(self):
+        job = TTSJob.create(user_id="u", input_text="t", max_retries=3)
+        job.mark_processing()
+        job.mark_failed("error")
+        assert job.is_retryable
+        assert job.retry_count == 0
+
+    def test_prepare_retry_resets_to_pending(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.mark_failed("error")
+
+        job.prepare_retry()
+        assert job.status == TTSJobStatus.PENDING
+        assert job.retry_count == 1
+        assert job.error_message == ""
+        assert job.started_at is None
+        assert job.completed_at is None
+
+    def test_retry_up_to_max_retries(self):
+        job = TTSJob.create(user_id="u", input_text="t", max_retries=2)
+        # 第 1 次失败 + 重试 → retry_count=1，还可以重试
+        job.mark_processing()
+        job.mark_failed("e1")
+        assert job.is_retryable
+        job.prepare_retry()
+        assert job.retry_count == 1
+
+        # 第 2 次失败 → retry_count=1，还是 failed 状态，还可以重试（max_retries=2）
+        job.mark_processing()
+        job.mark_failed("e2")
+        assert job.is_retryable  # retry_count=1 < max_retries=2
+        job.prepare_retry()
+        assert job.retry_count == 2
+
+        # 第 3 次失败 → retry_count=2，达到上限，不可重试
+        job.mark_processing()
+        job.mark_failed("e3")
+        assert not job.is_retryable  # retry_count=2 == max_retries=2
+
+    def test_retry_exceed_max_raises(self):
+        job = TTSJob.create(user_id="u", input_text="t", max_retries=1)
+        job.mark_processing()
+        job.mark_failed("e")
+        job.prepare_retry()  # 第 1 次重试，用完了
+
+        job.mark_processing()
+        job.mark_failed("e2")
+        with pytest.raises(ValueError, match="不可重试"):
+            job.prepare_retry()
+
+    def test_pending_not_retryable(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        assert not job.is_retryable
+        with pytest.raises(ValueError, match="不可重试"):
+            job.prepare_retry()
+
+    def test_completed_not_retryable(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.mark_completed(output_audio_url="https://example.com/out.mp3")
+        assert not job.is_retryable
+        with pytest.raises(ValueError, match="不可重试"):
+            job.prepare_retry()
+
+    def test_cancelled_not_retryable(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_cancelled()
+        assert not job.is_retryable
+
+
+class TestTTSJobMarkCompleted:
+    """mark_completed 方法测试."""
+
+    def test_requires_output_url(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        with pytest.raises(ValueError, match="output_audio_url"):
+            job.mark_completed(output_audio_url="")
+
+    def test_sets_all_fields(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.mark_completed(
+            output_audio_url="https://example.com/out.mp3",
+            output_audio_key="audio/001.mp3",
+            duration=30.5,
+            file_size=102400,
+        )
+        assert job.output_audio_url == "https://example.com/out.mp3"
+        assert job.output_audio_key == "audio/001.mp3"
+        assert job.duration == 30.5
+        assert job.file_size == 102400
+        assert job.completed_at is not None
+
+    def test_strips_whitespace(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.mark_completed(
+            output_audio_url="  https://example.com/out.mp3  ",
+            output_audio_key="  audio/001.mp3  ",
+        )
+        assert job.output_audio_url == "https://example.com/out.mp3"
+        assert job.output_audio_key == "audio/001.mp3"
+
+
+class TestTTSJobIsCompleted:
+    """is_completed 属性测试."""
+
+    def test_completed_with_url_is_completed(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.mark_completed(output_audio_url="https://example.com/out.mp3")
+        assert job.is_completed
+
+    def test_completed_without_url_not_completed(self):
+        """极端情况：completed 状态但没有 URL（理论不会发生）"""
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.transition_to(TTSJobStatus.COMPLETED)  # 直接转，不设 URL
+        assert not job.is_completed
+
+    def test_pending_not_completed(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        assert not job.is_completed
+
+
+class TestTTSJobToDict:
+    """to_dict 序列化测试."""
+
+    def test_pending_job_to_dict(self):
+        job = TTSJob.create(user_id="user_001", input_text="测试文本", voice_id="v001")
+        d = job.to_dict()
+        assert d["id"] == job.id
+        assert d["user_id"] == "user_001"
+        assert d["status"] == "pending"
+        assert d["input_text"] == "测试文本"
+        assert d["voice_id"] == "v001"
+        assert d["retry_count"] == 0
+        assert d["is_retryable"] is False
+        assert d["is_completed"] is False
+        assert d["metadata"] == {}
+        assert d["started_at"] is None
+        assert d["completed_at"] is None
+        assert d["created_at"] is not None
+        assert d["updated_at"] is not None
+
+    def test_completed_job_to_dict(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_processing()
+        job.mark_completed(output_audio_url="https://example.com/out.mp3", duration=10.0)
+        d = job.to_dict()
+        assert d["status"] == "completed"
+        assert d["output_audio_url"] == "https://example.com/out.mp3"
+        assert d["duration"] == 10.0
+        assert d["is_completed"] is True
+        assert d["started_at"] is not None
+        assert d["completed_at"] is not None
+
+    def test_failed_job_to_dict(self):
+        job = TTSJob.create(user_id="u", input_text="t")
+        job.mark_failed("出错了")
+        d = job.to_dict()
+        assert d["status"] == "failed"
+        assert d["error_message"] == "出错了"
+        assert d["is_retryable"] is True