[Feature]: Add integration tests with real API endpoints

[PPeitsch]

⚡ [Feature]: Add integration tests with real API endpoints

Guidelines

• I agree to follow this project's Contributing Guidelines
• I have searched for similar feature requests
• I understand that this is a request and implementation is not guaranteed

Problem Description

The project currently lacks integration tests that validate the connector's behavior against real BCRA API endpoints. While unit tests with mocks exist, we need to verify actual API interactions.

Proposed Solution

Implement comprehensive integration tests:

@pytest.mark.integration
class TestBCRAIntegration:
    @pytest.fixture(autouse=True)
    def setup(self):
        self.connector = BCRAConnector(
            verify_ssl=False,
            rate_limit=RateLimitConfig(calls=10, period=1.0)
        )

    def test_full_workflow(self):
        """Test complete API workflow."""
        variables = self.connector.get_principales_variables()
        assert len(variables) > 0
        
        # Test historical data
        if variables:
            data = self.connector.get_datos_variable(
                variables[0].idVariable,
                datetime.now() - timedelta(days=30),
                datetime.now()
            )
            assert len(data) > 0

Alternative Solutions

1. Use VCR pattern to record and replay API responses
2. Implement a mock BCRA API server for testing
3. Use a staging environment if available

Additional Context

Integration tests should verify:

• All API endpoints
• Error handling with real API responses
• Rate limiting behavior
• Timeout scenarios
• Full workflow scenarios

Implementation Details

Required components:

1. Test Configuration:

   • Environment variables support
   • Rate limit settings
   • Timeout configuration
   • Skip markers for CI/CD

2. Test Categories:

   • API endpoint verification
   • Error handling scenarios
   • Rate limiting tests
   • Full workflow tests

3. CI/CD Integration:

   • Skip options for integration tests
   • Separate test running configurations
   • Documentation for test execution