test: add category feature tests

Tests for category feature (Issue #88):

Category Management Tests (11 tests):
- test_add_category_requires_admin
- test_add_category_duplicate_slug_fails
- test_add_category_invalid_slug_fails_uppercase
- test_add_category_invalid_slug_fails_with_numbers
- test_add_category_invalid_slug_fails_with_symbols
- test_add_category_invalid_slug_fails_empty
- test_add_category_valid
- test_delete_category_soft_deletes
- test_deleted_category_not_listed
- test_list_categories_empty
- test_list_categories_returns_active
- test_get_category_not_found
- test_get_category_deleted_returns_none
- test_add_category_requires_admin_non_existent_room

Category-to-Bounty Tests (10 tests):
- test_add_category_to_bounty
- test_add_duplicate_category_to_bounty_noop
- test_add_category_to_bounty_invalid_bounty
- test_add_category_to_bounty_invalid_category
- test_remove_category_from_bounty
- test_remove_category_not_on_bounty_returns_false
- test_update_bounty_categories_replace_all
- test_update_bounty_categories_clear_all
- test_update_bounty_categories_validates
- test_add_category_to_bounty_requires_admin
- test_remove_category_from_bounty_requires_admin
- test_update_bounty_categories_requires_admin
- test_delete_category_requires_admin

All 123 tests pass (96 original + 27 new)

tests/test_services.py

@@ -404,3 +404,283 @@ class TestTrackingService:
         assert len(tracked_room2) == 1
         assert tracked_room1[0].text == "Room 1"
         assert tracked_room2[0].text == "Room 2"
+
+
+class TestCategoryService:
+    """Unit tests for category management."""
+
+    def setup_method(self):
+        """Set up fresh storage and service for each test."""
+        self.storage = MockRoomStorage()
+        self.service = BountyService(self.storage)
+        self.admin_username = "admin"
+        self._make_admin(-1001, self.admin_username)
+
+    def _make_admin(self, room_id: int, username: str):
+        """Helper to set up a room with an admin user."""
+        room_data = self.storage.load(room_id)
+        if room_data is None:
+            room_data = RoomData(
+                room_id=room_id, bounties=[], next_id=0, admin_usernames=[]
+            )
+        if username not in (room_data.admin_usernames or []):
+            room_data.admin_usernames = room_data.admin_usernames or []
+            room_data.admin_usernames.append(username)
+        self.storage.save(room_data)
+
+    def _add_bounty(self, text="Test bounty"):
+        """Helper to add a bounty for category tests."""
+        return self.service.add_bounty(
+            room_id=-1001, user_id=123, username=self.admin_username, text=text
+        )
+
+    # Category Management Tests
+
+    def test_add_category_requires_admin(self):
+        """Test that add_category raises PermissionError for non-admin."""
+        with pytest.raises(PermissionError, match="Only admins can add categories"):
+            self.service.add_category(-1001, "bug", "Bug Report", "nonadmin")
+
+    def test_add_category_duplicate_slug_fails(self):
+        """Test that adding a duplicate category slug raises ValueError."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        with pytest.raises(ValueError, match="already exists"):
+            self.service.add_category(-1001, "bug", "Bug Report 2", self.admin_username)
+
+    def test_add_category_invalid_slug_fails_uppercase(self):
+        """Test that uppercase slug raises ValueError."""
+        with pytest.raises(ValueError, match="lowercase alphabetic only"):
+            self.service.add_category(-1001, "Bug", "Bug Report", self.admin_username)
+
+    def test_add_category_invalid_slug_fails_with_numbers(self):
+        """Test that slug with numbers raises ValueError."""
+        with pytest.raises(ValueError, match="lowercase alphabetic only"):
+            self.service.add_category(-1001, "bug1", "Bug 1", self.admin_username)
+
+    def test_add_category_invalid_slug_fails_with_symbols(self):
+        """Test that slug with symbols raises ValueError."""
+        with pytest.raises(ValueError, match="lowercase alphabetic only"):
+            self.service.add_category(-1001, "bug-fix", "Bug Fix", self.admin_username)
+
+    def test_add_category_invalid_slug_fails_empty(self):
+        """Test that empty slug raises ValueError."""
+        with pytest.raises(ValueError, match="lowercase alphabetic only"):
+            self.service.add_category(-1001, "", "Empty", self.admin_username)
+
+    def test_add_category_valid(self):
+        """Test that valid category can be created."""
+        category = self.service.add_category(
+            -1001, "bug", "Bug Report", self.admin_username
+        )
+        assert category.id == "bug"
+        assert category.name == "Bug Report"
+        assert category.created_at > 0
+        assert category.deleted_at is None
+
+    def test_delete_category_soft_deletes(self):
+        """Test that delete_category performs soft delete."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        result = self.service.delete_category(-1001, "bug", self.admin_username)
+        assert result is True
+
+        # Category should not be found via get_category
+        assert self.service.get_category(-1001, "bug") is None
+
+        # But should still be in raw room data (soft delete)
+        room_data = self.storage.load(-1001)
+        for cat in room_data.categories:
+            if cat.id == "bug":
+                assert cat.deleted_at is not None
+                return
+        assert False, "Category should still exist in storage"
+
+    def test_deleted_category_not_listed(self):
+        """Test that list_categories excludes soft-deleted categories."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        self.service.delete_category(-1001, "bug", self.admin_username)
+
+        categories = self.service.list_categories(-1001)
+        assert len(categories) == 0
+        assert not any(cat.id == "bug" for cat in categories)
+
+    def test_list_categories_empty(self):
+        """Test that list_categories returns empty list for room with no categories."""
+        categories = self.service.list_categories(-1001)
+        assert categories == []
+
+    def test_list_categories_returns_active(self):
+        """Test that list_categories returns only active categories."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        self.service.add_category(-1001, "feature", "Feature Request", self.admin_username)
+        self.service.add_category(-1001, "docs", "Documentation", self.admin_username)
+        self.service.delete_category(-1001, "bug", self.admin_username)
+
+        categories = self.service.list_categories(-1001)
+        assert len(categories) == 2
+        category_ids = [c.id for c in categories]
+        assert "feature" in category_ids
+        assert "docs" in category_ids
+        assert "bug" not in category_ids
+
+    def test_get_category_not_found(self):
+        """Test that get_category returns None for non-existent category."""
+        category = self.service.get_category(-1001, "nonexistent")
+        assert category is None
+
+    def test_get_category_deleted_returns_none(self):
+        """Test that get_category returns None for soft-deleted category."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        self.service.delete_category(-1001, "bug", self.admin_username)
+
+        category = self.service.get_category(-1001, "bug")
+        assert category is None
+
+    def test_add_category_requires_admin_non_existent_room(self):
+        """Test that add_category works for non-existent room (creates it)."""
+        self._make_admin(-9999, self.admin_username)
+        category = self.service.add_category(
+            -9999, "bug", "Bug Report", self.admin_username
+        )
+        assert category.id == "bug"
+
+    # Category-to-Bounty Association Tests
+
+    def test_add_category_to_bounty(self):
+        """Test adding category to a bounty."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+
+        result = self.service.add_category_to_bounty(
+            -1001, bounty.id, "bug", self.admin_username
+        )
+        assert result is True
+
+        updated_bounty = self.service.get_bounty(-1001, bounty.id)
+        assert "bug" in updated_bounty.category_ids
+
+    def test_add_duplicate_category_to_bounty_noop(self):
+        """Test that adding duplicate category returns False."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+
+        self.service.add_category_to_bounty(-1001, bounty.id, "bug", self.admin_username)
+        result = self.service.add_category_to_bounty(
+            -1001, bounty.id, "bug", self.admin_username
+        )
+        assert result is False
+
+    def test_add_category_to_bounty_invalid_bounty(self):
+        """Test that adding category to non-existent bounty raises ValueError."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+
+        with pytest.raises(ValueError, match="Bounty not found"):
+            self.service.add_category_to_bounty(-1001, 999, "bug", self.admin_username)
+
+    def test_add_category_to_bounty_invalid_category(self):
+        """Test that adding non-existent category raises ValueError."""
+        bounty = self._add_bounty()
+
+        with pytest.raises(ValueError, match="not found"):
+            self.service.add_category_to_bounty(
+                -1001, bounty.id, "nonexistent", self.admin_username
+            )
+
+    def test_remove_category_from_bounty(self):
+        """Test removing category from a bounty."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+        self.service.add_category_to_bounty(-1001, bounty.id, "bug", self.admin_username)
+
+        result = self.service.remove_category_from_bounty(
+            -1001, bounty.id, "bug", self.admin_username
+        )
+        assert result is True
+
+        updated_bounty = self.service.get_bounty(-1001, bounty.id)
+        assert "bug" not in updated_bounty.category_ids
+
+    def test_remove_category_not_on_bounty_returns_false(self):
+        """Test that removing category not on bounty returns False."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+
+        result = self.service.remove_category_from_bounty(
+            -1001, bounty.id, "bug", self.admin_username
+        )
+        assert result is False
+
+    def test_update_bounty_categories_replace_all(self):
+        """Test that update_bounty_categories replaces all categories."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        self.service.add_category(-1001, "feature", "Feature Request", self.admin_username)
+        self.service.add_category(-1001, "docs", "Documentation", self.admin_username)
+        bounty = self._add_bounty()
+
+        # Add initial categories
+        self.service.add_category_to_bounty(-1001, bounty.id, "bug", self.admin_username)
+
+        # Replace with different categories
+        self.service.update_bounty_categories(
+            -1001, bounty.id, ["feature", "docs"], self.admin_username
+        )
+
+        updated_bounty = self.service.get_bounty(-1001, bounty.id)
+        assert updated_bounty.category_ids == ["feature", "docs"]
+
+    def test_update_bounty_categories_clear_all(self):
+        """Test that update_bounty_categories can clear all categories."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+        self.service.add_category_to_bounty(-1001, bounty.id, "bug", self.admin_username)
+
+        self.service.update_bounty_categories(-1001, bounty.id, [], self.admin_username)
+
+        updated_bounty = self.service.get_bounty(-1001, bounty.id)
+        assert updated_bounty.category_ids == []
+
+    def test_update_bounty_categories_validates(self):
+        """Test that update_bounty_categories validates all slugs."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+
+        with pytest.raises(ValueError, match="not found"):
+            self.service.update_bounty_categories(
+                -1001, bounty.id, ["bug", "nonexistent"], self.admin_username
+            )
+
+    def test_add_category_to_bounty_requires_admin(self):
+        """Test that adding category to bounty requires admin."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+
+        with pytest.raises(PermissionError, match="Only admins"):
+            self.service.add_category_to_bounty(
+                -1001, bounty.id, "bug", "nonadmin"
+            )
+
+    def test_remove_category_from_bounty_requires_admin(self):
+        """Test that removing category from bounty requires admin."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+        bounty = self._add_bounty()
+        self.service.add_category_to_bounty(-1001, bounty.id, "bug", self.admin_username)
+
+        with pytest.raises(PermissionError, match="Only admins"):
+            self.service.remove_category_from_bounty(
+                -1001, bounty.id, "bug", "nonadmin"
+            )
+
+    def test_update_bounty_categories_requires_admin(self):
+        """Test that updating bounty categories requires admin."""
+        bounty = self._add_bounty()
+
+        with pytest.raises(PermissionError, match="Only admins"):
+            self.service.update_bounty_categories(
+                -1001, bounty.id, ["bug"], "nonadmin"
+            )
+
+    def test_delete_category_requires_admin(self):
+        """Test that deleting category requires admin."""
+        self.service.add_category(-1001, "bug", "Bug Report", self.admin_username)
+
+        with pytest.raises(PermissionError, match="Only admins"):
+            self.service.delete_category(-1001, "bug", "nonadmin")