diff --git a/tests/unit/test_wave77_generation_task.py b/tests/unit/test_wave77_generation_task.py
new file mode 100755
index 000000000..5d9c24ebb
--- /dev/null
+++ b/tests/unit/test_wave77_generation_task.py
@@ -0,0 +1,466 @@
+"""第77波：GenerationTask 领域模型纯逻辑单测。"""
+
+import json
+
+import pytest
+
+from packages.domain.generation_task import GenerationTask, GenerationTaskStatus
+
+# ============================================================
+# GenerationTaskStatus._missing_ 兼容枚举测试
+# ============================================================
+
+
+class TestGenerationTaskStatusMissing:
+    def test_completed_aliases(self):
+        for val in ("done", "success", "finished", "complete", "completed"):
+            assert GenerationTaskStatus(val) == GenerationTaskStatus.COMPLETED
+            assert GenerationTaskStatus(val.upper()) == GenerationTaskStatus.COMPLETED
+
+    def test_failed_aliases(self):
+        for val in ("fail", "failed", "error", "err"):
+            assert GenerationTaskStatus(val) == GenerationTaskStatus.FAILED
+
+    def test_running_aliases(self):
+        for val in ("process", "processing", "run", "running", "in_progress"):
+            assert GenerationTaskStatus(val) == GenerationTaskStatus.RUNNING
+
+    def test_cancelled_aliases(self):
+        for val in ("cancel", "cancelled", "canceled"):
+            assert GenerationTaskStatus(val) == GenerationTaskStatus.CANCELLED
+
+    def test_unknown_defaults_to_pending(self):
+        assert GenerationTaskStatus("unknown_state") == GenerationTaskStatus.PENDING
+        assert GenerationTaskStatus("") == GenerationTaskStatus.PENDING
+
+    def test_whitespace_and_case_insensitive(self):
+        assert GenerationTaskStatus("  DONE  ") == GenerationTaskStatus.COMPLETED
+        assert GenerationTaskStatus("Failed") == GenerationTaskStatus.FAILED
+
+    def test_non_string_falls_back_to_pending(self):
+        assert GenerationTaskStatus(None) == GenerationTaskStatus.PENDING
+        assert GenerationTaskStatus(123) == GenerationTaskStatus.PENDING
+
+    def test_normal_values_still_work(self):
+        assert GenerationTaskStatus("pending") == GenerationTaskStatus.PENDING
+        assert GenerationTaskStatus("running") == GenerationTaskStatus.RUNNING
+        assert GenerationTaskStatus("completed") == GenerationTaskStatus.COMPLETED
+        assert GenerationTaskStatus("failed") == GenerationTaskStatus.FAILED
+        assert GenerationTaskStatus("cancelled") == GenerationTaskStatus.CANCELLED
+
+
+# ============================================================
+# GenerationTask.create 测试
+# ============================================================
+
+
+class TestGenerationTaskCreate:
+    def test_create_minimal(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert task.id
+        assert task.project_id == "p1"
+        assert task.asset_library_id == "lib1"
+        assert task.status == GenerationTaskStatus.PENDING
+        assert task.progress == 0.0
+        assert task.result_count == 0
+        assert task.retry_count == 0
+        assert task.asset_ids == []
+        assert task.title_ids == []
+        assert task.voice_ids == []
+        assert task.bgm_config == {}
+        assert task.logs == "[]"
+
+    def test_create_requires_project_or_template(self):
+        """project_id 和 template_id 至少需要一个。"""
+        with pytest.raises(ValueError, match="至少需要提供一个"):
+            GenerationTask.create(project_id="", asset_library_id="lib1", template_id="")
+
+    def test_create_template_id_only(self):
+        task = GenerationTask.create(project_id="", template_id="tpl1", asset_library_id="lib1")
+        assert task.template_id == "tpl1"
+        assert task.project_id == ""
+
+    def test_create_requires_library_or_assets(self):
+        """asset_library_id 和 asset_ids/title_ids/voice_ids 至少需要一个。"""
+        with pytest.raises(ValueError, match="至少需要提供一个"):
+            GenerationTask.create(
+                project_id="p1",
+                asset_library_id="",
+                asset_ids=None,
+                title_ids=None,
+                voice_ids=None,
+            )
+
+    def test_create_asset_ids_only(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="", asset_ids=["a1", "a2"])
+        assert task.asset_ids == ["a1", "a2"]
+        assert task.asset_library_id == ""
+
+    def test_create_title_ids_only(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="", title_ids=["t1"])
+        assert task.title_ids == ["t1"]
+
+    def test_create_voice_ids_only(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="", voice_ids=["v1"])
+        assert task.voice_ids == ["v1"]
+
+    def test_create_full_params(self):
+        task = GenerationTask.create(
+            project_id="p1",
+            asset_library_id="lib1",
+            strategy_id="s1",
+            voice_library_id="vlib1",
+            template_id="tpl1",
+            asset_ids=["a1", "a2"],
+            title_ids=["t1"],
+            voice_ids=["v1"],
+            created_by_user_id="u1",
+            source_edit_plan_id="ep1",
+            asset_select_mode="random",
+            batch_id="batch_001",
+            video_title="测试视频",
+            resolution="1080p",
+            bgm_config={"volume": 0.5},
+            auto_retry_enabled=True,
+            auto_retry_max=3,
+        )
+        assert task.strategy_id == "s1"
+        assert task.voice_library_id == "vlib1"
+        assert task.template_id == "tpl1"
+        assert task.asset_ids == ["a1", "a2"]
+        assert task.title_ids == ["t1"]
+        assert task.voice_ids == ["v1"]
+        assert task.created_by_user_id == "u1"
+        assert task.source_edit_plan_id == "ep1"
+        assert task.asset_select_mode == "random"
+        assert task.batch_id == "batch_001"
+        assert task.video_title == "测试视频"
+        assert task.resolution == "1080p"
+        assert task.bgm_config == {"volume": 0.5}
+        assert task.auto_retry_enabled is True
+        assert task.auto_retry_max == 3
+
+    def test_create_strips_string_fields(self):
+        task = GenerationTask.create(
+            project_id=" p1 ",
+            asset_library_id=" lib1 ",
+            strategy_id=" s1 ",
+            template_id=" tpl1 ",
+            created_by_user_id=" u1 ",
+            video_title=" 测试 ",
+            resolution=" 1080p ",
+        )
+        assert task.project_id == "p1"
+        assert task.asset_library_id == "lib1"
+        assert task.strategy_id == "s1"
+        assert task.template_id == "tpl1"
+        assert task.created_by_user_id == "u1"
+        assert task.video_title == "测试"
+        assert task.resolution == "1080p"
+
+    def test_create_asset_ids_is_copy(self):
+        ids = ["a1", "a2"]
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1", asset_ids=ids)
+        ids.append("a3")
+        assert task.asset_ids == ["a1", "a2"]
+
+    def test_create_bgm_config_is_copy(self):
+        cfg = {"vol": 0.5}
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1", bgm_config=cfg)
+        cfg["vol"] = 0.8
+        assert task.bgm_config == {"vol": 0.5}
+
+    def test_create_id_unique(self):
+        t1 = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        t2 = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert t1.id != t2.id
+
+
+# ============================================================
+# GenerationTask 状态查询测试
+# ============================================================
+
+
+class TestGenerationTaskStatusQuery:
+    def test_is_terminal_pending_false(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert not task.is_terminal
+
+    def test_is_terminal_running_false(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        assert not task.is_terminal
+
+    def test_is_terminal_completed_true(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_completed()
+        assert task.is_terminal
+
+    def test_is_terminal_failed_true(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_failed("err")
+        assert task.is_terminal
+
+    def test_is_terminal_cancelled_true(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_cancelled()
+        assert task.is_terminal
+
+    def test_is_completed(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert not task.is_completed
+        task.mark_processing()
+        task.mark_completed()
+        assert task.is_completed
+
+    def test_is_failed(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert not task.is_failed
+        task.mark_processing()
+        task.mark_failed("err")
+        assert task.is_failed
+
+    def test_is_running(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert not task.is_running
+        task.mark_processing()
+        assert task.is_running
+
+
+# ============================================================
+# GenerationTask 状态转换测试
+# ============================================================
+
+
+class TestGenerationTaskTransitions:
+    def test_pending_to_running(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.RUNNING)
+        assert task.status == GenerationTaskStatus.RUNNING
+
+    def test_pending_to_failed(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.FAILED)
+        assert task.status == GenerationTaskStatus.FAILED
+
+    def test_pending_to_cancelled(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.CANCELLED)
+        assert task.status == GenerationTaskStatus.CANCELLED
+
+    def test_pending_to_completed_invalid(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        with pytest.raises(ValueError, match="非法状态转换"):
+            task.transition_to(GenerationTaskStatus.COMPLETED)
+
+    def test_running_to_completed(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.RUNNING)
+        task.transition_to(GenerationTaskStatus.COMPLETED)
+        assert task.status == GenerationTaskStatus.COMPLETED
+
+    def test_running_to_failed(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.RUNNING)
+        task.transition_to(GenerationTaskStatus.FAILED)
+        assert task.status == GenerationTaskStatus.FAILED
+
+    def test_running_to_cancelled(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.RUNNING)
+        task.transition_to(GenerationTaskStatus.CANCELLED)
+        assert task.status == GenerationTaskStatus.CANCELLED
+
+    def test_failed_to_pending(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.RUNNING)
+        task.transition_to(GenerationTaskStatus.FAILED)
+        task.transition_to(GenerationTaskStatus.PENDING)
+        assert task.status == GenerationTaskStatus.PENDING
+
+    def test_completed_to_pending_invalid(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to(GenerationTaskStatus.RUNNING)
+        task.transition_to(GenerationTaskStatus.COMPLETED)
+        with pytest.raises(ValueError):
+            task.transition_to(GenerationTaskStatus.PENDING)
+
+    def test_transition_to_accepts_string(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.transition_to("running")
+        assert task.status == GenerationTaskStatus.RUNNING
+
+    def test_transition_to_unknown_string_defaults_pending(self):
+        """_missing_ 兜底：未知字符串映射为 PENDING，再走状态机校验。"""
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        # 当前已经是 pending，pending→pending 不合法
+        with pytest.raises(ValueError, match="非法状态转换"):
+            task.transition_to("bogus_status")
+
+
+# ============================================================
+# GenerationTask 业务方法测试
+# ============================================================
+
+
+class TestGenerationTaskBusinessMethods:
+    def test_mark_processing_sets_started_at(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert task.started_at is None
+        task.mark_processing()
+        assert task.started_at is not None
+        assert task.status == GenerationTaskStatus.RUNNING
+
+    def test_mark_processing_clears_error(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.error_message = "old error"
+        task.mark_processing()
+        assert task.error_message == ""
+
+    def test_mark_completed_default_count(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_completed()
+        assert task.status == GenerationTaskStatus.COMPLETED
+        assert task.progress == 100.0
+        assert task.result_count == 1
+        assert task.completed_at is not None
+        assert task.error_message == ""
+
+    def test_mark_completed_custom_count(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_completed(result_count=5)
+        assert task.result_count == 5
+
+    def test_mark_failed_with_message(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_failed("网络超时")
+        assert task.status == GenerationTaskStatus.FAILED
+        assert task.error_message == "网络超时"
+        assert task.completed_at is not None
+
+    def test_mark_failed_with_error_info(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        info = {"error_type": "NetworkError", "stage": "download"}
+        task.mark_failed("超时", error_info=info)
+        assert task.error_info == info
+
+    def test_mark_failed_default_error_info(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_failed("未知错误")
+        assert "error_type" in task.error_info
+        assert task.error_info["message"] == "未知错误"
+        assert "failed_at" in task.error_info
+
+    def test_mark_cancelled_from_pending(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_cancelled()
+        assert task.status == GenerationTaskStatus.CANCELLED
+        assert task.completed_at is not None
+
+    def test_mark_cancelled_from_running(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_cancelled()
+        assert task.status == GenerationTaskStatus.CANCELLED
+
+    def test_mark_pending_from_failed(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.mark_processing()
+        task.mark_failed("err")
+        task.mark_pending_from_failed()
+        assert task.status == GenerationTaskStatus.PENDING
+        assert task.error_message == ""
+        assert task.error_info == {}
+        assert task.started_at is None
+        assert task.completed_at is None
+        assert task.progress == 0.0
+        assert task.result_count == 0
+        assert task.retry_count == 1
+
+    def test_mark_pending_from_failed_multiple_retries(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        for i in range(3):
+            task.mark_processing()
+            task.mark_failed(f"err{i}")
+            task.mark_pending_from_failed()
+            assert task.retry_count == i + 1
+        assert task.status == GenerationTaskStatus.PENDING
+
+    def test_mark_pending_from_failed_wrong_status_raises(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        with pytest.raises(ValueError, match="只有 failed 状态"):
+            task.mark_pending_from_failed()
+
+
+# ============================================================
+# GenerationTask 日志系统测试
+# ============================================================
+
+
+class TestGenerationTaskLogs:
+    def test_append_log_basic(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.append_log("初始化", "任务创建成功")
+        logs = task.get_logs()
+        assert len(logs) == 1
+        assert logs[0]["stage"] == "初始化"
+        assert logs[0]["message"] == "任务创建成功"
+        assert logs[0]["level"] == "INFO"
+        assert "ts" in logs[0]
+
+    def test_append_log_with_level(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.append_log("渲染", "渲染失败", level="ERROR")
+        logs = task.get_logs()
+        assert logs[0]["level"] == "ERROR"
+
+    def test_append_log_with_extra_fields(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.append_log("下载", "下载完成", asset_id="a1", duration=10.5)
+        logs = task.get_logs()
+        assert logs[0]["asset_id"] == "a1"
+        assert logs[0]["duration"] == 10.5
+
+    def test_append_multiple_logs(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        for i in range(5):
+            task.append_log(f"阶段{i}", f"消息{i}")
+        logs = task.get_logs()
+        assert len(logs) == 5
+        assert logs[0]["stage"] == "阶段0"
+        assert logs[4]["stage"] == "阶段4"
+
+    def test_get_logs_empty(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        assert task.get_logs() == []
+
+    def test_get_logs_corrupted_json(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.logs = "not valid json"
+        assert task.get_logs() == []
+
+    def test_append_log_respects_max_limit(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        # _MAX_LOGS = 200，超过后保留最新的 200 条
+        for i in range(250):
+            task.append_log("阶段", f"消息{i}")
+        logs = task.get_logs()
+        assert len(logs) == 200
+        assert logs[0]["message"] == "消息50"  # 前50条被截掉
+        assert logs[-1]["message"] == "消息249"
+
+    def test_logs_persisted_as_json_string(self):
+        task = GenerationTask.create(project_id="p1", asset_library_id="lib1")
+        task.append_log("阶段", "消息")
+        assert isinstance(task.logs, str)
+        # 可以被 json.loads 解析
+        parsed = json.loads(task.logs)
+        assert isinstance(parsed, list)
+        assert len(parsed) == 1