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"""
API Tests - Comprehensive Tests for FastAPI Endpoints.
This module contains unit tests for the REST API, including:
- Import tests
- Endpoint functionality tests
- Integration tests with TestClient
Run tests:
$ pytest tests/test_api.py -v
Author: Ranjit Behera
License: MIT
"""
from __future__ import annotations
import json
import sys
from pathlib import Path
import pytest
# Add src to path
sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
# =============================================================================
# Import Tests
# =============================================================================
class TestAPIImports:
"""Test that all API components can be imported."""
def test_import_server(self) -> None:
"""Test server module import."""
from api.server import app, create_app
assert app is not None
assert callable(create_app)
def test_import_extractor(self) -> None:
"""Test extractor import from data module."""
from data.extractor import EntityExtractor
extractor = EntityExtractor()
assert extractor is not None
def test_import_classifier(self) -> None:
"""Test classifier import from data module."""
from data.classifier import EmailClassifier
classifier = EmailClassifier()
assert classifier is not None
def test_import_models(self) -> None:
"""Test Pydantic models import."""
from api.server import (
EmailInput,
EntityResponse,
ClassificationResponse,
HealthResponse,
)
assert EmailInput is not None
assert EntityResponse is not None
# =============================================================================
# Logic Tests
# =============================================================================
class TestExtractionLogic:
"""Test entity extraction logic directly."""
def test_extraction_basic(self) -> None:
"""Test basic entity extraction."""
from data.extractor import EntityExtractor
extractor = EntityExtractor()
result = extractor.extract(
"Rs.2500 debited from account 1234 on 05-01-26"
)
assert result.amount == "2500"
assert result.type == "debit"
assert result.account is not None
def test_extraction_merchants(self) -> None:
"""Test merchant detection."""
from data.extractor import EntityExtractor
extractor = EntityExtractor()
result = extractor.extract(
"Rs.500 debited to swiggy@ybl via UPI"
)
assert result.merchant == "swiggy"
assert result.payment_method == "upi"
def test_extraction_full_email(self) -> None:
"""Test full email extraction."""
from data.extractor import EntityExtractor
extractor = EntityExtractor()
result = extractor.extract(
"HDFC Bank: Rs.2500.00 debited from A/c **3545 "
"on 05-01-26 to VPA swiggy@ybl. Ref: 123456789012"
)
assert result.is_valid()
assert result.confidence_score() >= 0.8
class TestClassificationLogic:
"""Test classification logic directly."""
def test_finance_classification(self) -> None:
"""Test finance email classification."""
from data.classifier import EmailClassifier
classifier = EmailClassifier()
result = classifier.classify(
subject="Transaction Alert",
sender="HDFC Bank",
body="Rs.500 debited from your account"
)
assert result.category == "finance"
assert result.is_transaction is True
def test_shopping_classification(self) -> None:
"""Test shopping email classification."""
from data.classifier import EmailClassifier
classifier = EmailClassifier()
result = classifier.classify(
subject="Your order has shipped",
sender="Amazon.in",
body="Your order #12345 is on the way"
)
assert result.category == "shopping"
def test_non_finance_classification(self) -> None:
"""Test non-finance classification."""
from data.classifier import EmailClassifier
classifier = EmailClassifier()
result = classifier.classify(
subject="Weekly Newsletter",
sender="Substack",
body="Top 10 articles this week"
)
assert result.category == "newsletter"
assert result.is_transaction is False
# =============================================================================
# FastAPI Endpoint Tests
# =============================================================================
class TestFastAPIClient:
"""Test API endpoints using TestClient."""
@pytest.fixture
def client(self):
"""Create test client."""
from fastapi.testclient import TestClient
from api.server import app
return TestClient(app)
def test_root_endpoint(self, client) -> None:
"""Test root endpoint returns API info."""
response = client.get("/")
assert response.status_code == 200
data = response.json()
assert "name" in data
assert "endpoints" in data
assert data["name"] == "LLM Mail Trainer API"
def test_health_endpoint(self, client) -> None:
"""Test health check endpoint."""
response = client.get("/health")
assert response.status_code == 200
data = response.json()
assert data["status"] == "healthy"
assert "version" in data
assert "uptime_seconds" in data
def test_stats_endpoint(self, client) -> None:
"""Test statistics endpoint."""
response = client.get("/stats")
assert response.status_code == 200
data = response.json()
assert "total_requests" in data
assert "uptime_seconds" in data
def test_extract_endpoint(self, client) -> None:
"""Test entity extraction endpoint."""
response = client.post(
"/extract",
json={
"subject": "Transaction Alert",
"body": "Rs.2500.00 debited from account 3545 on 05-01-26",
"sender": "HDFC Bank"
}
)
assert response.status_code == 200
data = response.json()
assert "success" in data
assert "entities" in data
assert data["entities"]["amount"] == "2500.00"
def test_extract_endpoint_validation(self, client) -> None:
"""Test extract endpoint validation."""
response = client.post(
"/extract",
json={
"body": "" # Empty body should fail validation
}
)
assert response.status_code == 422 # Validation error
def test_classify_endpoint(self, client) -> None:
"""Test classification endpoint."""
response = client.post(
"/classify",
json={
"subject": "Transaction Alert",
"body": "Your account has been debited",
"sender": "HDFC Bank"
}
)
assert response.status_code == 200
data = response.json()
assert data["category"] == "finance"
assert "confidence" in data
def test_analyze_endpoint(self, client) -> None:
"""Test full analysis endpoint."""
response = client.post(
"/analyze",
json={
"subject": "Transaction Alert",
"body": "Rs.500 debited from account 1234 on 01-01-26",
"sender": "HDFC Bank"
}
)
assert response.status_code == 200
data = response.json()
assert "classification" in data
assert "entities" in data # Should have entities for finance
assert data["classification"]["category"] == "finance"
def test_batch_endpoint(self, client) -> None:
"""Test batch processing endpoint."""
response = client.post(
"/batch",
json={
"emails": [
{
"subject": "Transaction 1",
"body": "Rs.100 debited",
"sender": "Bank"
},
{
"subject": "Transaction 2",
"body": "Rs.200 credited",
"sender": "Bank"
}
]
}
)
assert response.status_code == 200
data = response.json()
assert data["total_processed"] == 2
assert "results" in data
assert len(data["results"]) == 2
# =============================================================================
# Edge Case Tests
# =============================================================================
class TestEdgeCases:
"""Test edge cases and error handling."""
@pytest.fixture
def client(self):
"""Create test client."""
from fastapi.testclient import TestClient
from api.server import app
return TestClient(app)
def test_empty_body(self, client) -> None:
"""Test handling of empty body."""
response = client.post(
"/extract",
json={
"body": " " # Whitespace only
}
)
assert response.status_code == 422
def test_very_long_body(self, client) -> None:
"""Test handling of very long body."""
long_body = "Rs.100 debited. " * 100
response = client.post(
"/extract",
json={"body": long_body}
)
assert response.status_code == 200
def test_unicode_content(self, client) -> None:
"""Test handling of unicode content."""
response = client.post(
"/extract",
json={
"body": "₹500 डेबिट from खाता 1234"
}
)
assert response.status_code == 200
def test_batch_empty_list(self, client) -> None:
"""Test batch with empty list."""
response = client.post(
"/batch",
json={"emails": []}
)
assert response.status_code == 422 # Validation error
# =============================================================================
# Performance Tests
# =============================================================================
class TestPerformance:
"""Test API performance."""
@pytest.fixture
def client(self):
"""Create test client."""
from fastapi.testclient import TestClient
from api.server import app
return TestClient(app)
def test_extraction_speed(self, client) -> None:
"""Test extraction completes quickly."""
import time
start = time.time()
response = client.post(
"/extract",
json={"body": "Rs.500 debited on 01-01-26"}
)
elapsed = time.time() - start
assert response.status_code == 200
assert elapsed < 1.0 # Should complete in under 1 second
def test_batch_performance(self, client) -> None:
"""Test batch processing performance."""
import time
emails = [
{"body": f"Rs.{i*100} debited", "subject": f"Txn {i}"}
for i in range(10)
]
start = time.time()
response = client.post("/batch", json={"emails": emails})
elapsed = time.time() - start
assert response.status_code == 200
assert elapsed < 5.0 # 10 emails in under 5 seconds
if __name__ == "__main__":
pytest.main([__file__, "-v"])
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