add test config and basic tests for csv_parser

tests/conftest.py

@@ -0,0 +1,60 @@
+import asyncio
+from typing import AsyncGenerator
+import pytest
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
+from app.core.config import settings
+from app.core.dependencies import get_db
+from app.main import app
+# Use a test database suffix or a separate database for testing
+TEST_DATABASE_URL = settings.DATABASE_URL.replace(settings.POSTGRES_DB, f"test_{settings.POSTGRES_DB}")
+# Create async engine for test db
+test_engine = create_async_engine(
+    TEST_DATABASE_URL,
+    echo=False,
+    future=True,
+)
+
+TestAsyncSessionLocal = async_sessionmaker(
+    bind=test_engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+)
+
+# Global flag to track if test DB is accessible
+_db_offline = False
+
+
+@pytest.fixture(scope="session", autouse=True)
+def initialize_test_db():
+    """Create test tables and clean them up after all tests finish."""
+    global _db_offline
+    import asyncio
+    try:
+        loop = asyncio.get_event_loop_policy().get_event_loop()
+    except RuntimeError:
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+
+    async def setup_db():
+        async with test_engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)
+            await conn.run_sync(Base.metadata.create_all)
+
+    async def teardown_db():
+        async with test_engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)
+
+    try:
+        loop.run_until_complete(setup_db())
+    except Exception as e:
+        _db_offline = True
+        print(f"\nSkipping DB initialization (Postgres is likely offline): {e}\n")
+
+    yield
+
+    if not _db_offline:
+        try:
+            loop.run_until_complete(teardown_db())
+        except Exception:
+            pass

tests/services/test_csv_parser.py

@@ -0,0 +1,49 @@
+import pytest
+from app.core.exceptions import InvalidCSVException
+from app.utils.csv_parser import parse_and_validate_csv
+
+
+def test_parse_valid_csv():
+    valid_csv = (
+        "transaction_id,date,amount,category,description\n"
+        "TX1001,2026-06-25,120.50,Groceries,Weekly grocery shop\n"
+        "TX1002,06/26/2026,15.00,Coffee,Morning latte\n"
+    )
+    result = parse_and_validate_csv(valid_csv.encode("utf-8"))
+    assert len(result) == 2
+    assert result[0]["transaction_id"] == "TX1001"
+    assert result[0]["amount"] == 120.50
+    assert result[0]["date"] == "2026-06-25"
+    assert result[1]["transaction_id"] == "TX1002"
+    assert result[1]["amount"] == 15.00
+    assert result[1]["date"] == "2026-06-26"
+
+
+def test_parse_missing_headers():
+    invalid_csv = (
+        "transaction_id,amount,category,description\n"
+        "TX1001,120.50,Groceries,Weekly grocery shop\n"
+    )
+    with pytest.raises(InvalidCSVException) as exc_info:
+        parse_and_validate_csv(invalid_csv.encode("utf-8"))
+    assert "Missing required CSV columns" in str(exc_info.value)
+
+
+def test_parse_invalid_amount():
+    invalid_csv = (
+        "transaction_id,date,amount,category,description\n"
+        "TX1001,2026-06-25,abc,Groceries,Weekly grocery shop\n"
+    )
+    with pytest.raises(InvalidCSVException) as exc_info:
+        parse_and_validate_csv(invalid_csv.encode("utf-8"))
+    assert "Invalid amount" in str(exc_info.value)
+
+
+def test_parse_invalid_date():
+    invalid_csv = (
+        "transaction_id,date,amount,category,description\n"
+        "TX1001,invalid-date,120.50,Groceries,Weekly grocery shop\n"
+    )
+    with pytest.raises(InvalidCSVException) as exc_info:
+        parse_and_validate_csv(invalid_csv.encode("utf-8"))
+    assert "Invalid date format" in str(exc_info.value)