diff --git a/tests/unit/test_classification_domain.py b/tests/unit/test_classification_domain.py
index ef46fc511..5219983f9 100755
--- a/tests/unit/test_classification_domain.py
+++ b/tests/unit/test_classification_domain.py
@@ -206,4 +206,167 @@ class TestClassificationJobCreate:
 
     def test_create_id_is_hex(self):
         job = ClassificationJob.create(project_id="p", asset_id="a")
-        int(job.id, 16)  # 不抛异常就是合法 hex
+        assert job.created_at.tzinfo is not None
+        assert job.updated_at.tzinfo is not None
+
+
+class TestClassificationJobState:
+    """ClassificationJob 状态操作测试"""
+
+    def test_set_processing(self):
+        job = ClassificationJob.create(project_id="proj-1", asset_id="asset-1")
+        job.status = ClassificationJobStatus.PROCESSING
+        assert job.status == ClassificationJobStatus.PROCESSING
+
+    def test_set_completed_with_result(self):
+        job = ClassificationJob.create(project_id="proj-1", asset_id="asset-1")
+        job.status = ClassificationJobStatus.COMPLETED
+        job.classification = AssetClassification.SCENIC
+        job.confidence = 0.95
+        assert job.status == ClassificationJobStatus.COMPLETED
+        assert job.classification == "scenic"
+        assert job.confidence == pytest.approx(0.95)
+
+    def test_set_failed_with_error(self):
+        job = ClassificationJob.create(project_id="proj-1", asset_id="asset-1")
+        job.status = ClassificationJobStatus.FAILED
+        job.error_message = "model timeout"
+        assert job.status == ClassificationJobStatus.FAILED
+        assert job.error_message == "model timeout"
+
+    def test_confidence_range_zero(self):
+        job = ClassificationJob.create(project_id="proj-1", asset_id="asset-1")
+        job.confidence = 0.0
+        assert job.confidence == 0.0
+
+    def test_confidence_range_one(self):
+        job = ClassificationJob.create(project_id="proj-1", asset_id="asset-1")
+        job.confidence = 1.0
+        assert job.confidence == 1.0
+
+
+class TestClassificationJobStatusMissing:
+    """ClassificationJobStatus._missing_ 兼容行为测试"""
+
+    def test_done_maps_to_completed(self):
+        assert ClassificationJobStatus("done") == ClassificationJobStatus.COMPLETED
+
+    def test_success_maps_to_completed(self):
+        assert ClassificationJobStatus("success") == ClassificationJobStatus.COMPLETED
+
+    def test_finished_maps_to_completed(self):
+        assert ClassificationJobStatus("finished") == ClassificationJobStatus.COMPLETED
+
+    def test_complete_maps_to_completed(self):
+        assert ClassificationJobStatus("complete") == ClassificationJobStatus.COMPLETED
+
+    def test_fail_maps_to_failed(self):
+        assert ClassificationJobStatus("fail") == ClassificationJobStatus.FAILED
+
+    def test_error_maps_to_failed(self):
+        assert ClassificationJobStatus("error") == ClassificationJobStatus.FAILED
+
+    def test_err_maps_to_failed(self):
+        assert ClassificationJobStatus("err") == ClassificationJobStatus.FAILED
+
+    def test_unknown_maps_to_pending(self):
+        assert ClassificationJobStatus("unknown_status") == ClassificationJobStatus.PENDING
+
+    def test_case_insensitive_mapping(self):
+        assert ClassificationJobStatus("DONE") == ClassificationJobStatus.COMPLETED
+        assert ClassificationJobStatus("Done") == ClassificationJobStatus.COMPLETED
+
+    def test_whitespace_stripped(self):
+        assert ClassificationJobStatus("  done  ") == ClassificationJobStatus.COMPLETED
+
+
+class TestClassificationJobExtended:
+    """ClassificationJob 深度补充测试"""
+
+    def test_id_is_hex(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        int(job.id, 16)
+
+    def test_empty_classification(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        assert job.classification == ""
+
+    def test_zero_confidence(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        assert job.confidence == 0.0
+
+    def test_high_confidence(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        job.confidence = 0.99
+        assert job.confidence == pytest.approx(0.99)
+
+    def test_negative_confidence(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        job.confidence = -0.1
+        assert job.confidence == pytest.approx(-0.1)
+
+    def test_confidence_over_one(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        job.confidence = 1.5
+        assert job.confidence == pytest.approx(1.5)
+
+    def test_empty_error_message(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        assert job.error_message == ""
+
+    def test_long_error_message(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        long_msg = "error" * 100
+        job.error_message = long_msg
+        assert job.error_message == long_msg
+        assert len(job.error_message) == 500
+
+    def test_status_with_string_assignment(self):
+        job = ClassificationJob.create(project_id="p", asset_id="a")
+        job.status = "processing"
+        assert job.status == ClassificationJobStatus.PROCESSING
+
+
+class TestAssetLibraryKindExtended:
+    """AssetLibraryKind 深度补充测试"""
+
+    def test_image_value(self):
+        assert AssetLibraryKind.IMAGE == "image"
+
+    def test_all_three_kinds(self):
+        assert len(AssetLibraryKind) == 3
+
+    def test_is_string_enum(self):
+        assert isinstance(AssetLibraryKind.VIDEO, str)
+
+    def test_from_string(self):
+        assert AssetLibraryKind("video") == AssetLibraryKind.VIDEO
+
+
+class TestIngestJobStatusExtended:
+    """IngestJobStatus 深度补充测试"""
+
+    def test_is_string_enum(self):
+        assert isinstance(IngestJobStatus.PENDING, str)
+
+    def test_total_count(self):
+        assert len(IngestJobStatus) == 4
+
+    def test_from_string(self):
+        assert IngestJobStatus("pending") == IngestJobStatus.PENDING
+
+
+class TestAssetClassificationExtended:
+    """AssetClassification 深度补充测试"""
+
+    def test_total_count(self):
+        assert len(AssetClassification) == 9
+
+    def test_is_string_enum(self):
+        assert isinstance(AssetClassification.SCENIC, str)
+
+    def test_from_string(self):
+        assert AssetClassification("scenic") == AssetClassification.SCENIC
+
+    def test_other_category(self):
+        assert AssetClassification.OTHER == "other"
diff --git a/tests/unit/test_tts_config_domain.py b/tests/unit/test_tts_config_domain.py
index 61f068411..0c2087a2f 100755
--- a/tests/unit/test_tts_config_domain.py
+++ b/tests/unit/test_tts_config_domain.py
@@ -202,3 +202,139 @@ class TestTtsConfigClamp:
         config = TtsConfig.parse(data)
         assert isinstance(config.volume, float)
         assert config.volume == 1.0
+
+
+class TestTtsConfigTextEdge:
+    """文本字段边界测试."""
+
+    def test_long_text_preserved(self):
+        long_text = "配音文本" * 500
+        data = {"enabled": True, "voice_id": "v1", "text": long_text}
+        config = TtsConfig.parse(data)
+        assert config.text == long_text
+        assert len(config.text) == 2000
+
+    def test_unicode_text_preserved(self):
+        data = {"enabled": True, "voice_id": "v1", "text": "こんにちは世界🎵"}
+        config = TtsConfig.parse(data)
+        assert config.text == "こんにちは世界🎵"
+
+    def test_special_chars_text_preserved(self):
+        data = {"enabled": True, "voice_id": "v1", "text": "line1\nline2\t tab <>&\"'"}
+        config = TtsConfig.parse(data)
+        assert config.text == "line1\nline2\t tab <>&\"'"
+
+    def test_empty_text_ok(self):
+        data = {"enabled": True, "voice_id": "v1", "text": ""}
+        config = TtsConfig.parse(data)
+        assert config.text == ""
+
+    def test_text_none_fallback(self):
+        data = {"enabled": True, "voice_id": "v1", "text": None}
+        config = TtsConfig.parse(data)
+        assert config.text == ""
+
+
+class TestTtsConfigVoiceIdEdge:
+    """voice_id 边界测试."""
+
+    def test_very_long_voice_id_preserved(self):
+        long_id = "voice_" + "x" * 200
+        data = {"enabled": True, "voice_id": long_id}
+        config = TtsConfig.parse(data)
+        assert config.voice_id == long_id
+
+    def test_voice_id_empty_string_ok(self):
+        data = {"enabled": True, "voice_id": ""}
+        config = TtsConfig.parse(data)
+        assert config.voice_id == ""
+
+    def test_voice_id_unicode_ok(self):
+        data = {"enabled": True, "voice_id": "音色_测试_001"}
+        config = TtsConfig.parse(data)
+        assert config.voice_id == "音色_测试_001"
+
+
+class TestTtsConfigClampEdge:
+    """钳制边界附近值测试."""
+
+    def test_speed_just_below_min_clamped(self):
+        data = {"enabled": True, "speed": 0.499}
+        config = TtsConfig.parse(data)
+        assert config.speed == 0.5
+
+    def test_speed_just_above_max_clamped(self):
+        data = {"enabled": True, "speed": 2.001}
+        config = TtsConfig.parse(data)
+        assert config.speed == 2.0
+
+    def test_pitch_just_below_min_clamped(self):
+        data = {"enabled": True, "pitch": -12.1}
+        config = TtsConfig.parse(data)
+        assert config.pitch == -12
+
+    def test_pitch_just_above_max_clamped(self):
+        data = {"enabled": True, "pitch": 12.1}
+        config = TtsConfig.parse(data)
+        assert config.pitch == 12
+
+    def test_volume_just_below_min_clamped(self):
+        data = {"enabled": True, "volume": -0.001}
+        config = TtsConfig.parse(data)
+        assert config.volume == 0.0
+
+    def test_volume_just_above_max_clamped(self):
+        data = {"enabled": True, "volume": 1.001}
+        config = TtsConfig.parse(data)
+        assert config.volume == 1.0
+
+    def test_direct_construct_clamp_speed(self):
+        config = TtsConfig(enabled=True, speed=0.1)
+        config._clamp()
+        assert config.speed == 0.5
+
+    def test_direct_construct_clamp_pitch_volume(self):
+        config = TtsConfig(enabled=True, pitch=-20, volume=2.0)
+        config._clamp()
+        assert config.pitch == -12
+        assert config.volume == 1.0
+
+
+class TestTtsConfigAlignOverlapEdge:
+    """对齐与叠加模式边界."""
+
+    def test_align_mode_empty_string_fallback(self):
+        data = {"enabled": True, "align_mode": ""}
+        config = TtsConfig.parse(data)
+        assert config.align_mode == "full"
+
+    def test_overlap_mode_empty_string_fallback(self):
+        data = {"enabled": True, "overlap_mode": ""}
+        config = TtsConfig.parse(data)
+        assert config.overlap_mode == "replace"
+
+    def test_align_mode_case_sensitive(self):
+        data = {"enabled": True, "align_mode": "SUBTITLE"}
+        config = TtsConfig.parse(data)
+        assert config.align_mode == "full"
+
+
+class TestTtsConfigEquality:
+    """相等性与独立性测试."""
+
+    def test_same_config_equal(self):
+        c1 = TtsConfig(enabled=True, voice_id="v1", speed=1.5)
+        c2 = TtsConfig(enabled=True, voice_id="v1", speed=1.5)
+        assert c1 == c2
+
+    def test_different_config_not_equal(self):
+        c1 = TtsConfig(enabled=True, voice_id="v1")
+        c2 = TtsConfig(enabled=True, voice_id="v2")
+        assert c1 != c2
+
+    def test_modify_one_does_not_affect_other(self):
+        c1 = TtsConfig(enabled=True, voice_id="v1")
+        c2 = TtsConfig(enabled=True, voice_id="v1")
+        c2.speed = 2.0
+        assert c1.speed == 1.0
+        assert c1 != c2