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#!/usr/bin/env python3
"""
Unit Tests for Lambda Function
"""
import pytest
import json
import os
import sys
from pathlib import Path
from unittest.mock import Mock, patch, MagicMock
# Add project root to path
project_root = Path(__file__).parent.parent.parent
sys.path.append(str(project_root))
class TestLambdaFunction:
"""Unit tests for Lambda function"""
@pytest.fixture
def mock_event(self):
"""Mock event for testing"""
return {
'indicators': ['GDP', 'UNRATE'],
'start_date': '2024-01-01',
'end_date': '2024-01-31',
'options': {
'visualizations': True,
'correlation': True,
'forecasting': False,
'statistics': True
}
}
@pytest.fixture
def mock_context(self):
"""Mock context for testing"""
context = Mock()
context.function_name = 'fred-ml-processor'
context.function_version = '$LATEST'
context.invoked_function_arn = 'arn:aws:lambda:us-west-2:123456789012:function:fred-ml-processor'
context.memory_limit_in_mb = 512
context.remaining_time_in_millis = 300000
context.log_group_name = '/aws/lambda/fred-ml-processor'
context.log_stream_name = '2024/01/01/[$LATEST]123456789012'
return context
@patch('lambda.lambda_function.os.environ.get')
@patch('lambda.lambda_function.boto3.client')
def test_lambda_handler_success(self, mock_boto3_client, mock_os_environ, mock_event, mock_context):
"""Test successful Lambda function execution"""
# Mock environment variables
mock_os_environ.side_effect = lambda key, default=None: {
'FRED_API_KEY': 'test-api-key',
'S3_BUCKET': 'fredmlv1'
}.get(key, default)
# Mock AWS clients
mock_s3_client = Mock()
mock_lambda_client = Mock()
mock_boto3_client.side_effect = [mock_s3_client, mock_lambda_client]
# Mock FRED API response
with patch('lambda.lambda_function.requests.get') as mock_requests:
mock_response = Mock()
mock_response.status_code = 200
mock_response.json.return_value = {
'observations': [
{'date': '2024-01-01', 'value': '100.0'},
{'date': '2024-01-02', 'value': '101.0'}
]
}
mock_requests.return_value = mock_response
# Import and test Lambda function
sys.path.append(str(project_root / 'lambda'))
from lambda_function import lambda_handler
response = lambda_handler(mock_event, mock_context)
# Verify response structure
assert response['statusCode'] == 200
assert 'body' in response
response_body = json.loads(response['body'])
assert response_body['status'] == 'success'
assert 'report_id' in response_body
assert 'report_key' in response_body
@patch('lambda.lambda_function.os.environ.get')
def test_lambda_handler_missing_api_key(self, mock_os_environ, mock_event, mock_context):
"""Test Lambda function with missing API key"""
# Mock missing API key
mock_os_environ.return_value = None
sys.path.append(str(project_root / 'lambda'))
from lambda_function import lambda_handler
response = lambda_handler(mock_event, mock_context)
# Should handle missing API key gracefully
assert response['statusCode'] == 500
response_body = json.loads(response['body'])
assert response_body['status'] == 'error'
def test_lambda_handler_invalid_event(self, mock_context):
"""Test Lambda function with invalid event"""
invalid_event = {}
sys.path.append(str(project_root / 'lambda'))
from lambda_function import lambda_handler
response = lambda_handler(invalid_event, mock_context)
# Should handle invalid event gracefully
assert response['statusCode'] == 200 or response['statusCode'] == 500
@patch('lambda.lambda_function.os.environ.get')
@patch('lambda.lambda_function.boto3.client')
def test_fred_data_fetching(self, mock_boto3_client, mock_os_environ):
"""Test FRED data fetching functionality"""
# Mock environment
mock_os_environ.side_effect = lambda key, default=None: {
'FRED_API_KEY': 'test-api-key',
'S3_BUCKET': 'fredmlv1'
}.get(key, default)
mock_s3_client = Mock()
mock_lambda_client = Mock()
mock_boto3_client.side_effect = [mock_s3_client, mock_lambda_client]
sys.path.append(str(project_root / 'lambda'))
from lambda_function import get_fred_data
# Mock successful API response
with patch('lambda.lambda_function.requests.get') as mock_requests:
mock_response = Mock()
mock_response.status_code = 200
mock_response.json.return_value = {
'observations': [
{'date': '2024-01-01', 'value': '100.0'},
{'date': '2024-01-02', 'value': '101.0'}
]
}
mock_requests.return_value = mock_response
result = get_fred_data('GDP', '2024-01-01', '2024-01-31')
assert result is not None
assert len(result) > 0
@patch('lambda.lambda_function.os.environ.get')
@patch('lambda.lambda_function.boto3.client')
def test_dataframe_creation(self, mock_boto3_client, mock_os_environ):
"""Test DataFrame creation from series data"""
# Mock environment
mock_os_environ.side_effect = lambda key, default=None: {
'FRED_API_KEY': 'test-api-key',
'S3_BUCKET': 'fredmlv1'
}.get(key, default)
mock_s3_client = Mock()
mock_lambda_client = Mock()
mock_boto3_client.side_effect = [mock_s3_client, mock_lambda_client]
from lambda.lambda_function import create_dataframe
import pandas as pd
# Mock series data
series_data = {
'GDP': pd.Series([100.0, 101.0], index=pd.to_datetime(['2024-01-01', '2024-01-02'])),
'UNRATE': pd.Series([3.5, 3.6], index=pd.to_datetime(['2024-01-01', '2024-01-02']))
}
df = create_dataframe(series_data)
assert not df.empty
assert 'GDP' in df.columns
assert 'UNRATE' in df.columns
assert len(df) == 2
@patch('lambda.lambda_function.os.environ.get')
@patch('lambda.lambda_function.boto3.client')
def test_statistics_generation(self, mock_boto3_client, mock_os_environ):
"""Test statistics generation"""
# Mock environment
mock_os_environ.side_effect = lambda key, default=None: {
'FRED_API_KEY': 'test-api-key',
'S3_BUCKET': 'fredmlv1'
}.get(key, default)
mock_s3_client = Mock()
mock_lambda_client = Mock()
mock_boto3_client.side_effect = [mock_s3_client, mock_lambda_client]
from lambda.lambda_function import generate_statistics
import pandas as pd
# Create test DataFrame
df = pd.DataFrame({
'GDP': [100.0, 101.0, 102.0],
'UNRATE': [3.5, 3.6, 3.7]
})
stats = generate_statistics(df)
assert 'GDP' in stats
assert 'UNRATE' in stats
assert 'mean' in stats['GDP']
assert 'std' in stats['GDP']
assert 'min' in stats['GDP']
assert 'max' in stats['GDP']
@patch('lambda.lambda_function.os.environ.get')
@patch('lambda.lambda_function.boto3.client')
def test_s3_report_storage(self, mock_boto3_client, mock_os_environ):
"""Test S3 report storage"""
# Mock environment
mock_os_environ.side_effect = lambda key, default=None: {
'FRED_API_KEY': 'test-api-key',
'S3_BUCKET': 'fredmlv1'
}.get(key, default)
mock_s3_client = Mock()
mock_lambda_client = Mock()
mock_boto3_client.side_effect = [mock_s3_client, mock_lambda_client]
from lambda.lambda_function import save_report_to_s3
# Test report data
report_data = {
'report_id': 'test_report_123',
'timestamp': '2024-01-01T00:00:00',
'indicators': ['GDP'],
'data': []
}
result = save_report_to_s3(report_data, 'fredmlv1', 'test_report_123')
# Verify S3 put_object was called
mock_s3_client.put_object.assert_called_once()
call_args = mock_s3_client.put_object.call_args
assert call_args[1]['Bucket'] == 'fredmlv1'
assert 'test_report_123' in call_args[1]['Key']
assert call_args[1]['ContentType'] == 'application/json' |