diff --git a/bot/config.py b/bot/config.py
index 8a79626..019b5ed 100644
--- a/bot/config.py
+++ b/bot/config.py
@@ -3,9 +3,36 @@
 
 load_dotenv("../.env")
 
+
+def _require(name: str) -> str:
+    """Возвращает обязательную переменную окружения или бросает понятную ошибку."""
+    value = os.environ.get(name, "").strip()
+    if not value:
+        raise RuntimeError(f"Не задана переменная окружения {name}")
+    return value
+
+
+def _parse_admin_ids(raw: str) -> list[int]:
+    """Разбирает список id через запятую; пустые элементы пропускает."""
+    ids: list[int] = []
+    for item in raw.split(","):
+        item = item.strip()
+        if not item:
+            continue
+        try:
+            ids.append(int(item))
+        except ValueError:
+            raise RuntimeError(
+                f"ADMIN_IDS: «{item}» не число (нужны id через запятую)"
+            ) from None
+    if not ids:
+        raise RuntimeError("ADMIN_IDS не содержит ни одного id")
+    return ids
+
+
 class Settings:
-    bot_token: str = os.environ["BOT_TOKEN"]
-    admin_ids: list[int] = [int(i) for i in os.environ["ADMIN_IDS"].split(",")]
+    bot_token: str = _require("BOT_TOKEN")
+    admin_ids: list[int] = _parse_admin_ids(_require("ADMIN_IDS"))
     database_url: str = os.getenv("DATABASE_URL", "sqlite:///./data/cards.db")
     cards_per_session: int = int(os.getenv("CARDS_PER_SESSION", "4"))
     # schedule_interval_hours: int = int(os.getenv("SCHEDULE_INTERVAL_HOURS", "5"))  # не нужен при настройке почасового крона
diff --git a/bot/tests/test_cards_db.py b/bot/tests/test_cards_db.py
new file mode 100644
index 0000000..6bcdce6
--- /dev/null
+++ b/bot/tests/test_cards_db.py
@@ -0,0 +1,63 @@
+import os
+import sys
+
+import pytest
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+
+from cards import get_next_cards
+from models import Card
+
+
+def add_cards(db, count: int) -> None:
+    for i in range(1, count + 1):
+        db.add(
+            Card(
+                id=i,
+                question=f"Вопрос {i}",
+                answer=f"Ответ {i}",
+                category="Python",
+                tags="[]",
+                difficulty="easy",
+            )
+        )
+    db.commit()
+
+
+@pytest.fixture
+def db():
+    engine = create_engine(
+        "sqlite://",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Card.metadata.create_all(engine)
+    session = sessionmaker(bind=engine)()
+    try:
+        yield session
+    finally:
+        session.close()
+        engine.dispose()
+
+
+class TestGetNextCardsRealDb:
+    def test_returns_cards_after_last_id_in_order(self, db):
+        add_cards(db, 6)
+        result = get_next_cards(db, 3, last_id=2)
+        assert [c.id for c in result] == [3, 4, 5]
+
+    def test_wraps_around_to_start(self, db):
+        add_cards(db, 5)
+        result = get_next_cards(db, 3, last_id=4)
+        assert [c.id for c in result] == [5, 1, 2]
+
+    def test_last_id_beyond_max_starts_from_beginning(self, db):
+        add_cards(db, 5)
+        result = get_next_cards(db, 3, last_id=100)
+        assert [c.id for c in result] == [1, 2, 3]
+
+    def test_empty_db_returns_empty(self, db):
+        assert get_next_cards(db, 3, last_id=0) == []
diff --git a/bot/tests/test_config.py b/bot/tests/test_config.py
new file mode 100644
index 0000000..3ed305c
--- /dev/null
+++ b/bot/tests/test_config.py
@@ -0,0 +1,37 @@
+import os
+import sys
+
+import pytest
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+
+import config
+
+
+class TestRequire:
+    def test_returns_value(self, monkeypatch):
+        monkeypatch.setenv("TEST_REQUIRED_VAR", "abc")
+        assert config._require("TEST_REQUIRED_VAR") == "abc"
+
+    def test_missing_variable_names_it(self, monkeypatch):
+        monkeypatch.delenv("TEST_REQUIRED_VAR", raising=False)
+        with pytest.raises(RuntimeError, match="TEST_REQUIRED_VAR"):
+            config._require("TEST_REQUIRED_VAR")
+
+    def test_empty_variable_rejected(self, monkeypatch):
+        monkeypatch.setenv("TEST_REQUIRED_VAR", "  ")
+        with pytest.raises(RuntimeError, match="TEST_REQUIRED_VAR"):
+            config._require("TEST_REQUIRED_VAR")
+
+
+class TestParseAdminIds:
+    def test_valid_list(self):
+        assert config._parse_admin_ids("1, 22,333") == [1, 22, 333]
+
+    def test_skips_empty_items(self):
+        assert config._parse_admin_ids("1,2,") == [1, 2]
+
+    @pytest.mark.parametrize("raw", ["", " ", ",", "1,abc"])
+    def test_invalid_rejected_with_name(self, raw):
+        with pytest.raises(RuntimeError, match="ADMIN_IDS"):
+            config._parse_admin_ids(raw)