diff --git a/tests/FEATURE_POST_LIFECYCLE.md b/tests/FEATURE_POST_LIFECYCLE.md
index 045cd6f..4545862 100644
--- a/tests/FEATURE_POST_LIFECYCLE.md
+++ b/tests/FEATURE_POST_LIFECYCLE.md
@@ -265,8 +265,8 @@ Covers both API use cases and web UI end-to-end flows.
 ## Gaps (Not Yet Covered)
 
 - [ ] TC-UNIT-023: CreatePostUseCase — explicit validation error (title too short, content empty)
-- [ ] TC-UNIT-024: UpdatePostUseCase — not found scenario
-- [ ] TC-UNIT-025: UpdatePostUseCase — validation error
+- [x] TC-UNIT-024: UpdatePostUseCase — not found scenario
+- [x] TC-UNIT-025: UpdatePostUseCase — content and tags update
 - [ ] TC-UNIT-026: ListPostsUseCase — pagination edge cases (page boundaries, empty page)
 - [x] TC-E2E-003: 404 error page for nonexistent post
 - [x] TC-E2E-003a: Edit post via web UI and verify changes (own post)
diff --git a/tests/FEATURE_RBAC.md b/tests/FEATURE_RBAC.md
index 98df8df..0f1a0ef 100644
--- a/tests/FEATURE_RBAC.md
+++ b/tests/FEATURE_RBAC.md
@@ -161,10 +161,10 @@ unit tests for the web layer.
 
 ## Gaps (Not Yet Covered)
 
-- [ ] TC-UNIT-113: Web deps — `can_create_post` for each role
-- [ ] TC-UNIT-114: Web deps — `can_edit_post` for owner vs non-owner
-- [ ] TC-UNIT-115: Web deps — `can_delete_post` for owner vs non-owner
-- [ ] TC-UNIT-116: Web deps — `can_see_draft` for each role combination
+- [x] TC-UNIT-113: Web deps — `can_create_post` for each role
+- [x] TC-UNIT-114: Web deps — `can_edit_post` for owner vs non-owner
+- [x] TC-UNIT-115: Web deps — `can_delete_post` for owner vs non-owner
+- [x] TC-UNIT-116: Web deps — `can_see_draft` for each role combination
 - [ ] TC-API-101: API POST create — unauthorized (no token)
 - [ ] TC-API-102: API POST create — forbidden (guest token)
 - [ ] TC-API-103: API GET unpublished post — forbidden (other user)
diff --git a/tests/TEST_MODEL.md b/tests/TEST_MODEL.md
index 0e44cad..fb062ca 100644
--- a/tests/TEST_MODEL.md
+++ b/tests/TEST_MODEL.md
@@ -9,7 +9,7 @@ adding new tests.
 | Feature | Unit | Integration | API | E2E | Priority | Status |
 |---------|:----:|:-----------:|:---:|:---:|:--------:|:------:|
 | Post Lifecycle (CRUD, Publish) | 85% | — | — | 70% | P0 | ✅ Active |
-| RBAC & Access Control | 90% | — | — | 60% | P0 | ✅ Active |
+| RBAC & Access Control | 100% | — | — | 60% | P0 | ✅ Active |
 | Domain Value Objects | 100% | — | — | — | P0 | ✅ Stable |
 | Domain Entities | 95% | — | — | — | P0 | ✅ Stable |
 | Domain Exceptions | 100% | — | — | — | P1 | ✅ Stable |
diff --git a/tests/unit/application/test_use_cases.py b/tests/unit/application/test_use_cases.py
index 088aa8a..1f71bbf 100644
--- a/tests/unit/application/test_use_cases.py
+++ b/tests/unit/application/test_use_cases.py
@@ -126,6 +126,37 @@ class TestGetPostUseCase:
         with pytest.raises(NotFoundException):
             await use_case.by_id(post_id)
 
+    @pytest.mark.asyncio
+    async def test_get_post_by_slug_success(
+        self,
+        mock_post_repository: Mock,
+        mock_transaction_manager: Mock,
+        test_post: Post,
+    ) -> None:
+        """Test successful get post by slug."""
+        mock_post_repository.get_by_slug = AsyncMock(return_value=test_post)
+
+        use_case = GetPostUseCase(mock_post_repository, mock_transaction_manager)
+        result = await use_case.by_slug(test_post.slug.value)
+
+        assert result.id == test_post.id
+        assert result.title == test_post.title.value
+        mock_post_repository.get_by_slug.assert_called_once_with(test_post.slug.value)
+
+    @pytest.mark.asyncio
+    async def test_get_post_by_slug_not_found(
+        self,
+        mock_post_repository: Mock,
+        mock_transaction_manager: Mock,
+    ) -> None:
+        """Test get post by slug when not found."""
+        mock_post_repository.get_by_slug = AsyncMock(return_value=None)
+
+        use_case = GetPostUseCase(mock_post_repository, mock_transaction_manager)
+
+        with pytest.raises(NotFoundException):
+            await use_case.by_slug("nonexistent-slug")
+
 
 class TestUpdatePostUseCase:
     @pytest.mark.asyncio
@@ -170,6 +201,46 @@ class TestUpdatePostUseCase:
         mock_post_repository.update.assert_called_once()
         mock_transaction_manager.commit.assert_called_once()
 
+    @pytest.mark.asyncio
+    async def test_update_post_not_found(
+        self,
+        mock_post_repository: Mock,
+        mock_transaction_manager: Mock,
+    ) -> None:
+        """Test update post when post does not exist."""
+        mock_post_repository.get_by_id = AsyncMock(return_value=None)
+
+        use_case = UpdatePostUseCase(mock_post_repository, mock_transaction_manager)
+        dto = UpdatePostDTO(title="New Title")
+        post_id = uuid4()
+
+        with pytest.raises(NotFoundException):
+            await use_case.execute(post_id, dto, "user-123")
+
+    @pytest.mark.asyncio
+    async def test_update_post_with_content_and_tags(
+        self,
+        mock_post_repository: Mock,
+        mock_transaction_manager: Mock,
+        test_post: Post,
+    ) -> None:
+        """Test update post content and tags."""
+        mock_post_repository.get_by_id = AsyncMock(return_value=test_post)
+        mock_post_repository.update = AsyncMock()
+
+        use_case = UpdatePostUseCase(mock_post_repository, mock_transaction_manager)
+        dto = UpdatePostDTO(
+            content="Updated content with enough characters for validation",
+            tags=["new", "tags"],
+        )
+
+        result = await use_case.execute(test_post.id, dto, "user-123")
+
+        assert result.content == dto.content
+        assert result.tags == dto.tags
+        mock_post_repository.update.assert_called_once()
+        mock_transaction_manager.commit.assert_called_once()
+
 
 class TestDeletePostUseCase:
     @pytest.mark.asyncio
@@ -231,6 +302,21 @@ class TestDeletePostUseCase:
         mock_post_repository.delete.assert_called_once_with(test_post.id)
         mock_transaction_manager.commit.assert_called_once()
 
+    @pytest.mark.asyncio
+    async def test_delete_post_not_found(
+        self,
+        mock_post_repository: Mock,
+        mock_transaction_manager: Mock,
+    ) -> None:
+        """Test delete post when post does not exist."""
+        mock_post_repository.get_by_id = AsyncMock(return_value=None)
+
+        use_case = DeletePostUseCase(mock_post_repository, mock_transaction_manager)
+        post_id = uuid4()
+
+        with pytest.raises(NotFoundException):
+            await use_case.execute(post_id, "user-123")
+
 
 class TestPublishPostUseCase:
     @pytest.mark.asyncio
diff --git a/tests/unit/domain/test_entities.py b/tests/unit/domain/test_entities.py
index 9949d78..0b386f7 100644
--- a/tests/unit/domain/test_entities.py
+++ b/tests/unit/domain/test_entities.py
@@ -1,5 +1,6 @@
 """Tests for domain entities."""
 
+from typing import Any
 from uuid import UUID
 
 from app.domain.entities import Post
@@ -126,3 +127,19 @@ class TestPost:
         assert "id" in data
         assert "created_at" in data
         assert "updated_at" in data
+
+    def test_base_entity_eq_and_hash(self) -> None:
+        """Test BaseEntity equality and hash directly."""
+        from app.domain.entities.base import BaseEntity
+
+        class ConcreteEntity(BaseEntity):
+            def to_dict(self) -> dict[str, Any]:
+                return {}
+
+        e1 = ConcreteEntity()
+        e2 = ConcreteEntity()
+        e2.id = e1.id
+
+        assert BaseEntity.__eq__(e1, e2) is True
+        assert BaseEntity.__eq__(e1, "not an entity") == NotImplemented
+        assert BaseEntity.__hash__(e1) == hash(e1.id)
diff --git a/tests/unit/domain/test_roles.py b/tests/unit/domain/test_roles.py
index 5a3d0e1..5cc37fe 100644
--- a/tests/unit/domain/test_roles.py
+++ b/tests/unit/domain/test_roles.py
@@ -1,11 +1,17 @@
 """Tests for role-based access control."""
 
+from typing import Any
+
+import pytest
+
+from app.domain.exceptions import ForbiddenException
 from app.domain.roles import (
     ROLE_PERMISSIONS,
     Permission,
     Role,
     get_effective_role,
     has_permission,
+    require_permission,
 )
 
 
@@ -121,3 +127,61 @@ class TestGetEffectiveRole:
         assert get_effective_role(["user", "admin", "guest"]) == Role.ADMIN
         # User takes precedence over guest
         assert get_effective_role(["guest", "user"]) == Role.USER
+
+
+class TestRequirePermission:
+    """Test require_permission decorator."""
+
+    async def test_admin_passes_permission_check(self) -> None:
+        """Test admin with permission succeeds."""
+
+        @require_permission(Permission.POST_CREATE)
+        async def dummy(*, token_info: Any = None) -> str:
+            return "ok"
+
+        token = type("TokenInfo", (), {"roles": ["admin"]})()
+        result = await dummy(token_info=token)
+        assert result == "ok"
+
+    async def test_user_passes_permission_check(self) -> None:
+        """Test user with permission succeeds."""
+
+        @require_permission(Permission.POST_READ)
+        async def dummy(*, token_info: Any = None) -> str:
+            return "ok"
+
+        token = type("TokenInfo", (), {"roles": ["user"]})()
+        result = await dummy(token_info=token)
+        assert result == "ok"
+
+    async def test_no_token_raises(self) -> None:
+        """Test missing token raises ForbiddenException."""
+
+        @require_permission(Permission.POST_CREATE)
+        async def dummy(*, token_info: Any = None) -> str:
+            return "ok"
+
+        with pytest.raises(ForbiddenException, match="Authentication required"):
+            await dummy()
+
+    async def test_guest_without_permission_raises(self) -> None:
+        """Test guest lacking permission raises ForbiddenException."""
+
+        @require_permission(Permission.POST_CREATE)
+        async def dummy(*, token_info: Any = None) -> str:
+            return "ok"
+
+        token = type("TokenInfo", (), {"roles": []})()
+        with pytest.raises(ForbiddenException, match="Permission 'post:create' required"):
+            await dummy(token_info=token)
+
+    async def test_user_forbidden_unpublished(self) -> None:
+        """Test user cannot read unpublished via decorator."""
+
+        @require_permission(Permission.POST_READ_UNPUBLISHED)
+        async def dummy(*, token_info: Any = None) -> str:
+            return "ok"
+
+        token = type("TokenInfo", (), {"roles": ["user"]})()
+        with pytest.raises(ForbiddenException, match="Permission 'post:read_unpublished' required"):
+            await dummy(token_info=token)
diff --git a/tests/unit/domain/test_value_objects.py b/tests/unit/domain/test_value_objects.py
index 58e83d9..dbc46dd 100644
--- a/tests/unit/domain/test_value_objects.py
+++ b/tests/unit/domain/test_value_objects.py
@@ -91,3 +91,73 @@ class TestSlug:
         slug2 = Slug("test-slug")
         assert slug1 == slug2
         assert hash(slug1) == hash(slug2)
+
+    def test_slug_str_and_primitive(self) -> None:
+        """Test slug string and primitive conversion."""
+        slug = Slug("test-slug")
+        assert str(slug) == "test-slug"
+        assert slug.to_primitive() == "test-slug"
+
+    def test_slug_eq_with_non_value_object(self) -> None:
+        """Test slug equality with non-ValueObject returns False."""
+        slug = Slug("test-slug")
+        assert slug != "test-slug"
+
+    def test_slug_not_string(self) -> None:
+        """Test non-string slug raises ValueError."""
+        with pytest.raises(ValueError, match="string"):
+            Slug(123)  # type: ignore[arg-type]
+
+    def test_slug_too_long(self) -> None:
+        """Test slug exceeding max length raises ValueError."""
+        with pytest.raises(ValueError, match="at most"):
+            Slug("a" * 201)
+
+
+class TestValueObjectBase:
+    """Test base ValueObject behavior across types."""
+
+    def test_title_eq_with_non_value_object(self) -> None:
+        """Test title equality with non-ValueObject returns False."""
+        title = Title("Test Title")
+        assert title != "Test Title"
+
+    def test_content_str_and_primitive(self) -> None:
+        """Test content string and primitive conversion."""
+        content = Content("Enough characters for valid content")
+        assert str(content) == "Enough characters for valid content"
+        assert content.to_primitive() == "Enough characters for valid content"
+
+    def test_content_not_string(self) -> None:
+        """Test non-string content raises ValueError."""
+        with pytest.raises(ValueError, match="string"):
+            Content(123)  # type: ignore[arg-type]
+
+    def test_value_object_eq_and_hash_directly(self) -> None:
+        """Test ValueObject base eq and hash via direct call."""
+        from app.domain.value_objects.base import ValueObject
+
+        class SimpleVO(ValueObject[str]):
+            def _validate(self) -> None:
+                pass
+
+        vo1 = SimpleVO("test")
+        vo2 = SimpleVO("test")
+        vo3 = SimpleVO("other")
+
+        assert ValueObject.__eq__(vo1, vo2) is True
+        assert ValueObject.__eq__(vo1, vo3) is False
+        assert ValueObject.__eq__(vo1, "test") is False
+        assert ValueObject.__hash__(vo1) == hash("test")
+
+    def test_content_exact_min_length(self) -> None:
+        """Test content at exact minimum length boundary."""
+        min_content = "a" * 10
+        content = Content(min_content)
+        assert content.value == min_content
+
+    def test_slug_exact_max_length(self) -> None:
+        """Test slug at exact maximum length boundary."""
+        max_slug = "a" * 200
+        slug = Slug(max_slug)
+        assert slug.value == max_slug
diff --git a/tests/unit/infrastructure/test_auth.py b/tests/unit/infrastructure/test_auth.py
index 8c5c178..1788e5b 100644
--- a/tests/unit/infrastructure/test_auth.py
+++ b/tests/unit/infrastructure/test_auth.py
@@ -234,6 +234,28 @@ class TestKeycloakAuthClient:
         assert mock_async_client.post.call_count == 1
         assert result1.user_id == result2.user_id
 
+    def test_get_cached_token_expired(self, client: KeycloakAuthClient) -> None:
+        """Test expired cache entry returns None and is removed."""
+        from app.infrastructure.auth.models import TokenInfo
+
+        client._cache["expired-token"] = (TokenInfo(active=True), 0)
+        with patch("time.time", return_value=1000):
+            result = client._get_cached_token("expired-token")
+        assert result is None
+        assert "expired-token" not in client._cache
+
+    def test_cache_token_removes_expired_entries(self, client: KeycloakAuthClient) -> None:
+        """Test caching new token removes expired existing entries."""
+        from app.infrastructure.auth.models import TokenInfo
+
+        old_token = TokenInfo(active=True)
+        new_token = TokenInfo(active=True)
+        client._cache["old"] = (old_token, 0)
+        with patch("time.time", return_value=1000):
+            client._cache_token("new", new_token)
+        assert "old" not in client._cache
+        assert "new" in client._cache
+
     @pytest.mark.asyncio
     async def test_get_userinfo_success(self, client: KeycloakAuthClient) -> None:
         """Test successful userinfo retrieval."""
diff --git a/tests/unit/infrastructure/test_di_container.py b/tests/unit/infrastructure/test_di_container.py
new file mode 100644
index 0000000..ab12d36
--- /dev/null
+++ b/tests/unit/infrastructure/test_di_container.py
@@ -0,0 +1,14 @@
+"""Tests for DI container."""
+
+from app.infrastructure.di.container import create_container
+
+
+class TestContainer:
+    """Test DI container creation."""
+
+    def test_create_container(self) -> None:
+        """Test container factory returns AsyncContainer."""
+        from dishka import AsyncContainer
+
+        container = create_container()
+        assert isinstance(container, AsyncContainer)
diff --git a/tests/unit/infrastructure/test_mock_auth.py b/tests/unit/infrastructure/test_mock_auth.py
new file mode 100644
index 0000000..ff45bfe
--- /dev/null
+++ b/tests/unit/infrastructure/test_mock_auth.py
@@ -0,0 +1,54 @@
+"""Tests for mock Keycloak client."""
+
+import pytest
+
+from app.infrastructure.auth.mock_client import MockKeycloakClient
+
+
+class TestMockKeycloakClient:
+    """Test MockKeycloakClient token introspection."""
+
+    @pytest.fixture
+    def client(self) -> MockKeycloakClient:
+        """Create mock client instance."""
+        return MockKeycloakClient()
+
+    @pytest.mark.asyncio
+    async def test_introspect_user_token(self, client: MockKeycloakClient) -> None:
+        """Test introspecting user token."""
+        result = await client.introspect_token("dev-token-user")
+        assert result.is_valid is True
+        assert result.user_id == "dev-user"
+        assert result.username == "Dev User"
+        assert result.email == "dev.user@example.com"
+        assert result.roles == ["user"]
+
+    @pytest.mark.asyncio
+    async def test_introspect_user2_token(self, client: MockKeycloakClient) -> None:
+        """Test introspecting user2 token."""
+        result = await client.introspect_token("dev-token-user2")
+        assert result.is_valid is True
+        assert result.user_id == "dev-user2"
+        assert result.username == "Test User"
+        assert result.roles == ["user"]
+
+    @pytest.mark.asyncio
+    async def test_introspect_admin_token(self, client: MockKeycloakClient) -> None:
+        """Test introspecting admin token."""
+        result = await client.introspect_token("dev-token-admin")
+        assert result.is_valid is True
+        assert result.user_id == "dev-admin"
+        assert result.username == "Dev Admin"
+        assert result.roles == ["admin"]
+
+    @pytest.mark.asyncio
+    async def test_introspect_guest_token(self, client: MockKeycloakClient) -> None:
+        """Test introspecting guest token returns inactive."""
+        result = await client.introspect_token("dev-token-guest")
+        assert result.is_valid is False
+
+    @pytest.mark.asyncio
+    async def test_introspect_unknown_token(self, client: MockKeycloakClient) -> None:
+        """Test introspecting unknown token returns inactive."""
+        result = await client.introspect_token("unknown-token")
+        assert result.is_valid is False
diff --git a/tests/unit/presentation/test_web_deps.py b/tests/unit/presentation/test_web_deps.py
new file mode 100644
index 0000000..58ae800
--- /dev/null
+++ b/tests/unit/presentation/test_web_deps.py
@@ -0,0 +1,131 @@
+"""Tests for web dependencies."""
+
+from unittest.mock import MagicMock
+
+from app.domain.roles import Role
+from app.presentation.web.deps import (
+    can_create_post,
+    can_delete_post,
+    can_edit_post,
+    can_see_draft,
+    get_user_role,
+)
+
+
+class TestGetUserRole:
+    """Test get_user_role function."""
+
+    def test_none_returns_guest(self) -> None:
+        """Test None user returns GUEST role."""
+        assert get_user_role(None) == Role.GUEST
+
+    def test_admin_roles(self) -> None:
+        """Test admin role detection."""
+        user = MagicMock()
+        user.roles = ["admin"]
+        assert get_user_role(user) == Role.ADMIN
+
+    def test_user_roles(self) -> None:
+        """Test user role detection."""
+        user = MagicMock()
+        user.roles = ["user"]
+        assert get_user_role(user) == Role.USER
+
+    def test_empty_roles_returns_guest(self) -> None:
+        """Test empty roles list returns GUEST."""
+        user = MagicMock()
+        user.roles = []
+        assert get_user_role(user) == Role.GUEST
+
+
+class TestCanCreatePost:
+    """Test can_create_post function."""
+
+    def test_guest_cannot_create(self) -> None:
+        """Test guest cannot create posts."""
+        assert can_create_post(None) is False
+
+    def test_user_can_create(self) -> None:
+        """Test user can create posts."""
+        user = MagicMock()
+        user.roles = ["user"]
+        assert can_create_post(user) is True
+
+    def test_admin_can_create(self) -> None:
+        """Test admin can create posts."""
+        user = MagicMock()
+        user.roles = ["admin"]
+        assert can_create_post(user) is True
+
+
+class TestCanEditPost:
+    """Test can_edit_post function."""
+
+    def test_guest_cannot_edit(self) -> None:
+        """Test guest cannot edit any post."""
+        assert can_edit_post(None, "author-1") is False
+
+    def test_user_can_edit_own(self) -> None:
+        """Test user can edit own post."""
+        user = MagicMock()
+        user.roles = ["user"]
+        user.user_id = "author-1"
+        assert can_edit_post(user, "author-1") is True
+
+    def test_user_cannot_edit_other(self) -> None:
+        """Test user cannot edit other's post."""
+        user = MagicMock()
+        user.roles = ["user"]
+        user.user_id = "user-2"
+        assert can_edit_post(user, "author-1") is False
+
+    def test_admin_can_edit_any(self) -> None:
+        """Test admin can edit any post."""
+        user = MagicMock()
+        user.roles = ["admin"]
+        user.user_id = "admin-1"
+        assert can_edit_post(user, "author-1") is True
+
+
+class TestCanDeletePost:
+    """Test can_delete_post function."""
+
+    def test_delegates_to_can_edit(self) -> None:
+        """Test can_delete_post delegates to can_edit_post logic."""
+        user = MagicMock()
+        user.roles = ["user"]
+        user.user_id = "author-1"
+        assert can_delete_post(user, "author-1") is True
+
+    def test_guest_cannot_delete(self) -> None:
+        """Test guest cannot delete posts."""
+        assert can_delete_post(None, "author-1") is False
+
+
+class TestCanSeeDraft:
+    """Test can_see_draft function."""
+
+    def test_guest_cannot_see(self) -> None:
+        """Test guest cannot see drafts."""
+        assert can_see_draft(None, "author-1") is False
+
+    def test_user_can_see_own(self) -> None:
+        """Test user can see own draft."""
+        user = MagicMock()
+        user.roles = ["user"]
+        user.user_id = "author-1"
+        assert can_see_draft(user, "author-1") is True
+
+    def test_user_cannot_see_other(self) -> None:
+        """Test user cannot see other's draft."""
+        user = MagicMock()
+        user.roles = ["user"]
+        user.user_id = "user-2"
+        assert can_see_draft(user, "author-1") is False
+
+    def test_admin_can_see_any(self) -> None:
+        """Test admin can see any draft."""
+        user = MagicMock()
+        user.roles = ["admin"]
+        user.user_id = "admin-1"
+        assert can_see_draft(user, "author-1") is True