feat: refactor project

backend/tests/test_config.py

@@ -0,0 +1,53 @@
+"""Tests for configuration and SQL loading."""
+
+from app.config import SQL_DIR, Settings, load_sql
+
+
+class TestSettings:
+    """Tests for the Settings class."""
+
+    def test_default_values(self):
+        s = Settings()
+        assert s.POSTGRES_HOST in ("localhost", s.POSTGRES_HOST)
+        assert s.POSTGRES_PORT == int(s.POSTGRES_PORT)
+        assert s.K_FACTOR > 0
+        assert s.DEFAULT_ELO > 0
+
+    def test_database_url_format(self):
+        s = Settings()
+        url = s.database_url
+        assert url.startswith("postgresql+psycopg2://")
+        assert str(s.POSTGRES_HOST) in url
+
+
+class TestLoadSql:
+    """Tests for the SQL file loader."""
+
+    def test_sql_dir_exists(self):
+        assert SQL_DIR.is_dir()
+
+    def test_all_sql_files_exist(self):
+        expected = [
+            "listing_select.sql",
+            "recent_pairs.sql",
+            "history.sql",
+            "count_comparisons.sql",
+            "count_rated.sql",
+            "count_listings.sql",
+            "elo_aggregates.sql",
+            "elo_distribution.sql",
+            "listing_images.sql",
+        ]
+        for name in expected:
+            assert (SQL_DIR / name).is_file(), f"Missing SQL file: {name}"
+
+    def test_load_sql_substitutes_schemas(self):
+        sql = load_sql("listing_select.sql")
+        # Should not contain any unresolved placeholders
+        assert "{" not in sql
+        assert "}" not in sql
+
+    def test_load_sql_returns_string(self):
+        sql = load_sql("count_comparisons.sql")
+        assert isinstance(sql, str)
+        assert "count" in sql.lower()