diff --git a/tests/unit/test_in_memory_repositories.py b/tests/unit/test_in_memory_repositories.py
new file mode 100755
index 000000000..a926d1372
--- /dev/null
+++ b/tests/unit/test_in_memory_repositories.py
@@ -0,0 +1,201 @@
+"""
+In-Memory 项目仓储 + 小仓储测试.
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+
+import pytest
+
+from packages.adapters.in_memory.project_repository import InMemoryProjectRepository
+from packages.adapters.in_memory.classification_job_repository import InMemoryClassificationJobRepository
+from packages.adapters.in_memory.ingest_job_repository import InMemoryIngestJobRepository
+from packages.domain import Project, ClassificationJob, IngestJob
+
+
+# ── Project Repository ──────────────────────────────────────────────────────
+
+@pytest.fixture
+def project_repo():
+    return InMemoryProjectRepository()
+
+
+@pytest.fixture
+def make_project():
+    counter = 0
+
+    def _make(owner_id: str = "user_1", name: str = "测试项目"):
+        nonlocal counter
+        counter += 1
+        return Project(
+            id=f"proj_{counter}",
+            owner_user_id=owner_id,
+            name=name,
+        )
+
+    return _make
+
+
+class TestInMemoryProjectRepository:
+    """项目仓储."""
+
+    def test_save_and_find_by_id(self, project_repo, make_project):
+        proj = make_project()
+        project_repo.save(proj)
+        found = project_repo.find_by_id(proj.id)
+        assert found is not None
+        assert found.id == proj.id
+        assert found.name == "测试项目"
+
+    def test_find_by_id_not_found(self, project_repo):
+        assert project_repo.find_by_id("nonexistent") is None
+
+    def test_find_by_owner(self, project_repo, make_project):
+        for i in range(3):
+            project_repo.save(make_project(owner_id="user_1", name=f"p{i}"))
+        project_repo.save(make_project(owner_id="user_2", name="other"))
+
+        result = project_repo.find_by_owner_user_id("user_1")
+        assert len(result) == 3
+        assert all(p.owner_user_id == "user_1" for p in result)
+
+    def test_count_by_owner(self, project_repo, make_project):
+        for i in range(5):
+            project_repo.save(make_project(owner_id="user_1", name=f"p{i}"))
+        project_repo.save(make_project(owner_id="user_2", name="other"))
+        assert project_repo.count_by_owner("user_1") == 5
+        assert project_repo.count_by_owner("user_2") == 1
+        assert project_repo.count_by_owner("user_3") == 0
+
+    def test_delete_existing(self, project_repo, make_project):
+        proj = make_project()
+        project_repo.save(proj)
+        result = project_repo.delete(proj.id)
+        assert result is True
+        assert project_repo.find_by_id(proj.id) is None
+
+    def test_delete_nonexistent(self, project_repo):
+        assert project_repo.delete("nonexistent") is False
+
+    def test_save_updates(self, project_repo, make_project):
+        proj = make_project(name="v1")
+        project_repo.save(proj)
+        proj.name = "v2"
+        project_repo.save(proj)
+        found = project_repo.find_by_id(proj.id)
+        assert found.name == "v2"
+
+    def test_find_accessible_projects(self, project_repo, make_project):
+        p1 = make_project(owner_id="user_1", name="owned")
+        project_repo.save(p1)
+        # 自己拥有的项目可访问
+        result = project_repo.find_accessible_projects("user_1")
+        assert len(result) >= 1
+        assert any(p.id == p1.id for p in result)
+
+
+# ── Classification Job Repository ──────────────────────────────────────────
+
+@pytest.fixture
+def classif_repo():
+    return InMemoryClassificationJobRepository()
+
+
+class TestInMemoryClassificationJobRepository:
+    """分类任务仓储."""
+
+    def test_create_and_get(self, classif_repo):
+        job = ClassificationJob(
+            id="job_1",
+            project_id="p1",
+            asset_id="a1",
+            status="pending",
+        )
+        classif_repo.create(job)
+        found = classif_repo.get("job_1")
+        assert found is not None
+        assert found.id == "job_1"
+        assert found.status == "pending"
+
+    def test_get_not_found(self, classif_repo):
+        assert classif_repo.get("nonexistent") is None
+
+    def test_update(self, classif_repo):
+        job = ClassificationJob(
+            id="job_1",
+            project_id="p1",
+            asset_id="a1",
+            status="pending",
+        )
+        classif_repo.create(job)
+        job.status = "completed"
+        classif_repo.update(job)
+        found = classif_repo.get("job_1")
+        assert found.status == "completed"
+
+    def test_update_nonexistent_creates(self, classif_repo):
+        """update 对不存在的也会写入（dict 赋值）"""
+        job = ClassificationJob(
+            id="new_job",
+            project_id="p1",
+            asset_id="a1",
+            status="running",
+        )
+        classif_repo.update(job)
+        found = classif_repo.get("new_job")
+        assert found is not None
+
+
+# ── Ingest Job Repository ──────────────────────────────────────────────────
+
+@pytest.fixture
+def ingest_repo():
+    return InMemoryIngestJobRepository()
+
+
+class TestInMemoryIngestJobRepository:
+    """导入任务仓储."""
+
+    def test_create_and_get(self, ingest_repo):
+        job = IngestJob(
+            id="ingest_1",
+            project_id="p1",
+            library_id="lib1",
+            storage_key="key1",
+            status="pending",
+        )
+        ingest_repo.create(job)
+        found = ingest_repo.get("ingest_1")
+        assert found is not None
+        assert found.id == "ingest_1"
+        assert found.status == "pending"
+
+    def test_get_not_found(self, ingest_repo):
+        assert ingest_repo.get("nonexistent") is None
+
+    def test_update(self, ingest_repo):
+        job = IngestJob(
+            id="ingest_1",
+            project_id="p1",
+            library_id="lib1",
+            storage_key="key1",
+            status="pending",
+        )
+        ingest_repo.create(job)
+        job.status = "completed"
+        ingest_repo.update(job)
+        found = ingest_repo.get("ingest_1")
+        assert found.status == "completed"
+
+    def test_update_nonexistent_creates(self, ingest_repo):
+        job = IngestJob(
+            id="new_ingest",
+            project_id="p1",
+            library_id="lib1",
+            storage_key="key1",
+            status="running",
+        )
+        ingest_repo.update(job)
+        found = ingest_repo.get("new_ingest")
+        assert found is not None
diff --git a/tests/unit/test_in_memory_tag_repository.py b/tests/unit/test_in_memory_tag_repository.py
new file mode 100755
index 000000000..a63034069
--- /dev/null
+++ b/tests/unit/test_in_memory_tag_repository.py
@@ -0,0 +1,174 @@
+"""
+In-Memory 标签仓储测试.
+"""
+
+from __future__ import annotations
+
+import time
+from datetime import datetime
+
+import pytest
+
+from packages.adapters.in_memory.tag_repository import InMemoryTagRepository
+from packages.domain import Tag
+
+
+@pytest.fixture
+def repo():
+    return InMemoryTagRepository()
+
+
+@pytest.fixture
+def make_tag():
+    counter = 0
+
+    def _make(user_id: str = "user_1", name: str = "默认标签"):
+        nonlocal counter
+        counter += 1
+        return Tag(
+            id=f"tag_{counter}",
+            user_id=user_id,
+            name=name,
+            created_at=datetime.now(),
+        )
+
+    return _make
+
+
+class TestInMemoryTagRepositoryCreate:
+    """创建标签."""
+
+    def test_create_tag(self, repo, make_tag):
+        tag = make_tag()
+        result = repo.create(tag)
+        assert result.id == tag.id
+        assert result.name == tag.name
+
+    def test_create_same_id_overwrites(self, repo, make_tag):
+        tag = make_tag(name="first")
+        repo.create(tag)
+        tag.name = "second"
+        repo.create(tag)
+        found = repo.get(tag.id)
+        assert found.name == "second"
+
+
+class TestInMemoryTagRepositoryGet:
+    """获取标签."""
+
+    def test_get_existing(self, repo, make_tag):
+        tag = make_tag()
+        repo.create(tag)
+        found = repo.get(tag.id)
+        assert found is not None
+        assert found.id == tag.id
+
+    def test_get_nonexistent(self, repo):
+        assert repo.get("nonexistent") is None
+
+
+class TestInMemoryTagRepositoryFindByName:
+    """按名称查找."""
+
+    def test_find_by_name_found(self, repo, make_tag):
+        tag = make_tag(name="风景")
+        repo.create(tag)
+        found = repo.find_by_name("user_1", "风景")
+        assert found is not None
+        assert found.id == tag.id
+
+    def test_find_by_name_not_found(self, repo, make_tag):
+        tag = make_tag(name="风景")
+        repo.create(tag)
+        assert repo.find_by_name("user_1", "美食") is None
+        assert repo.find_by_name("user_2", "风景") is None
+
+    def test_find_by_name_different_user(self, repo, make_tag):
+        tag = make_tag(user_id="user_1", name="风景")
+        repo.create(tag)
+        assert repo.find_by_name("user_2", "风景") is None
+
+
+class TestInMemoryTagRepositoryListByUser:
+    """用户标签列表."""
+
+    def test_list_by_user_empty(self, repo):
+        result = repo.list_by_user("user_1")
+        assert result == []
+
+    def test_list_by_user_filters_correctly(self, repo, make_tag):
+        for i in range(5):
+            make_tag(user_id="user_1", name=f"标签{i}")
+            repo.create(make_tag(user_id="user_1", name=f"标签{i}"))
+        repo.create(make_tag(user_id="user_2", name="其他标签"))
+
+        result = repo.list_by_user("user_1")
+        assert len(result) == 5
+        assert all(t.user_id == "user_1" for t in result)
+
+    def test_list_sorted_by_created_desc(self, repo, make_tag):
+        tags = []
+        for i in range(3):
+            tag = make_tag(name=f"t{i}")
+            tag.created_at = datetime.fromtimestamp(1000 + i * 100)
+            repo.create(tag)
+            tags.append(tag)
+
+        result = repo.list_by_user("user_1")
+        assert len(result) == 3
+        # 最新的排在前面
+        assert result[0].created_at > result[2].created_at
+
+    def test_list_pagination(self, repo, make_tag):
+        for i in range(10):
+            repo.create(make_tag(name=f"tag{i}"))
+
+        page1 = repo.list_by_user("user_1", skip=0, limit=3)
+        page2 = repo.list_by_user("user_1", skip=3, limit=3)
+        assert len(page1) == 3
+        assert len(page2) == 3
+        assert page1[0].id != page2[0].id
+
+    def test_list_limit_exceeds_total(self, repo, make_tag):
+        for i in range(3):
+            repo.create(make_tag(name=f"t{i}"))
+        result = repo.list_by_user("user_1", skip=0, limit=100)
+        assert len(result) == 3
+
+
+class TestInMemoryTagRepositoryCount:
+    """统计用户标签数."""
+
+    def test_count_zero(self, repo):
+        assert repo.count_by_user("user_1") == 0
+
+    def test_count_correct(self, repo, make_tag):
+        for i in range(7):
+            repo.create(make_tag(user_id="user_1", name=f"t{i}"))
+        repo.create(make_tag(user_id="user_2", name="other"))
+        assert repo.count_by_user("user_1") == 7
+        assert repo.count_by_user("user_2") == 1
+
+
+class TestInMemoryTagRepositoryDelete:
+    """删除标签."""
+
+    def test_delete_existing(self, repo, make_tag):
+        tag = make_tag()
+        repo.create(tag)
+        result = repo.delete(tag.id)
+        assert result is True
+        assert repo.get(tag.id) is None
+
+    def test_delete_nonexistent(self, repo):
+        result = repo.delete("nonexistent")
+        assert result is False
+
+    def test_delete_does_not_affect_others(self, repo, make_tag):
+        t1 = make_tag(name="a")
+        t2 = make_tag(name="b")
+        repo.create(t1)
+        repo.create(t2)
+        repo.delete(t1.id)
+        assert repo.get(t2.id) is not None
+        assert repo.count_by_user("user_1") == 1
diff --git a/tests/unit/test_in_memory_user_repository.py b/tests/unit/test_in_memory_user_repository.py
new file mode 100755
index 000000000..9975d5502
--- /dev/null
+++ b/tests/unit/test_in_memory_user_repository.py
@@ -0,0 +1,189 @@
+"""
+In-Memory 用户仓储测试.
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+
+import pytest
+
+from packages.adapters.in_memory.user_repository import InMemoryUserRepository
+from packages.domain.entities import User
+
+
+@pytest.fixture
+def repo():
+    return InMemoryUserRepository()
+
+
+@pytest.fixture
+def sample_user():
+    return User(
+        id="user_1",
+        email="test@example.com",
+        display_name="Test User",
+        username="testuser",
+        password_hash="hashed",
+        email_verified=True,
+        email_verification_token="verify_token",
+        password_reset_token="reset_token",
+        wechat_openid="openid_123",
+        wechat_unionid="unionid_123",
+        phone="13800138000",
+    )
+
+
+class TestInMemoryUserRepositorySave:
+    """保存用户."""
+
+    def test_save_new_user(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_id("user_1")
+        assert found is not None
+        assert found.email == "test@example.com"
+
+    def test_save_updates_existing(self, repo, sample_user):
+        repo.save(sample_user)
+        sample_user.display_name = "Updated"
+        repo.save(sample_user)
+        found = repo.find_by_id("user_1")
+        assert found.display_name == "Updated"
+
+    def test_email_index_case_insensitive(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_email("TEST@EXAMPLE.COM")
+        assert found is not None
+        assert found.id == "user_1"
+
+    def test_username_index_case_insensitive(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_username("TESTUSER")
+        assert found is not None
+        assert found.id == "user_1"
+
+
+class TestInMemoryUserRepositoryFind:
+    """各种查找方式."""
+
+    def test_find_by_id_found(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_id("user_1")
+        assert found.id == "user_1"
+
+    def test_find_by_id_not_found(self, repo):
+        assert repo.find_by_id("nonexistent") is None
+
+    def test_find_by_email_found(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_email("test@example.com")
+        assert found.id == "user_1"
+
+    def test_find_by_email_not_found(self, repo):
+        assert repo.find_by_email("no@example.com") is None
+
+    def test_find_by_username_found(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_username("testuser")
+        assert found.id == "user_1"
+
+    def test_find_by_username_not_found(self, repo):
+        assert repo.find_by_username("nobody") is None
+
+    def test_find_by_verification_token(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_verification_token("verify_token")
+        assert found.id == "user_1"
+
+    def test_find_by_verification_token_not_found(self, repo):
+        assert repo.find_by_verification_token("bad_token") is None
+
+    def test_find_by_password_reset_token(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_password_reset_token("reset_token")
+        assert found.id == "user_1"
+
+    def test_find_by_password_reset_token_not_found(self, repo):
+        assert repo.find_by_password_reset_token("bad_token") is None
+
+    def test_find_by_wechat_openid(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_wechat_openid("openid_123")
+        assert found.id == "user_1"
+
+    def test_find_by_wechat_openid_not_found(self, repo):
+        assert repo.find_by_wechat_openid("bad_openid") is None
+
+    def test_find_by_wechat_unionid(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_wechat_unionid("unionid_123")
+        assert found.id == "user_1"
+
+    def test_find_by_wechat_unionid_empty_returns_none(self, repo):
+        """空 unionid 直接返回 None."""
+        assert repo.find_by_wechat_unionid("") is None
+        assert repo.find_by_wechat_unionid(None) is None  # type: ignore
+
+    def test_find_by_wechat_unionid_not_found(self, repo):
+        assert repo.find_by_wechat_unionid("bad_unionid") is None
+
+    def test_find_by_phone(self, repo, sample_user):
+        repo.save(sample_user)
+        found = repo.find_by_phone("13800138000")
+        assert found.id == "user_1"
+
+    def test_find_by_phone_empty_returns_none(self, repo):
+        assert repo.find_by_phone("") is None
+        assert repo.find_by_phone(None) is None  # type: ignore
+
+    def test_find_by_phone_not_found(self, repo):
+        assert repo.find_by_phone("13900139000") is None
+
+    def test_user_without_username_not_in_username_index(self, repo):
+        user = User(id="u2", email="no_user@example.com", display_name="No Username")
+        repo.save(user)
+        assert repo.find_by_username("") is None
+
+
+class TestInMemoryUserRepositoryDelete:
+    """删除用户."""
+
+    def test_delete_existing(self, repo, sample_user):
+        repo.save(sample_user)
+        result = repo.delete("user_1")
+        assert result is True
+        assert repo.find_by_id("user_1") is None
+        assert repo.find_by_email("test@example.com") is None
+        assert repo.find_by_username("testuser") is None
+        assert repo.find_by_verification_token("verify_token") is None
+        assert repo.find_by_password_reset_token("reset_token") is None
+
+    def test_delete_nonexistent(self, repo):
+        result = repo.delete("nonexistent")
+        assert result is False
+
+    def test_delete_cleans_wechat_and_phone_indexes(self, repo, sample_user):
+        repo.save(sample_user)
+        repo.delete("user_1")
+        assert repo.find_by_wechat_openid("openid_123") is None
+        assert repo.find_by_wechat_unionid("unionid_123") is None
+        assert repo.find_by_phone("13800138000") is None
+
+
+class TestInMemoryUserRepositoryMultipleUsers:
+    """多用户场景."""
+
+    def test_multiple_users(self, repo):
+        for i in range(5):
+            user = User(
+                id=f"user_{i}",
+                email=f"user{i}@example.com",
+                display_name=f"User {i}",
+                username=f"user{i}",
+            )
+            repo.save(user)
+
+        for i in range(5):
+            assert repo.find_by_id(f"user_{i}") is not None
+            assert repo.find_by_email(f"user{i}@example.com") is not None
+            assert repo.find_by_username(f"user{i}") is not None