// Implement mock callout class
@isTest
global class BrevoMockHttpResponseGenerator implements HttpCalloutMock {
    // Implement this interface method
    global HTTPResponse respond(HTTPRequest req) {
        // Create a fake response
        HttpResponse res = new HttpResponse();
        res.setHeader('Content-Type', 'application/json');
        if (req.getMethod() == 'GET') {
            if (req.getEndpoint().contains('test@example.com')) {
                res.setBody('{"email":"test@example.com"}'); // Set the body as per your requirement for GET
                res.setStatusCode(200);
            } else if (req.getEndpoint().contains('test2@example.com')) {
                res.setBody('{"error":"Contact not found"}'); // Set the body as per your requirement for GET
                res.setStatusCode(404);
            }
        } else if (req.getMethod() == 'PUT') {
            res.setBody('{"id":"123"}'); // Set the body as per your requirement for PUT
            res.setStatusCode(204);
        } else if (req.getMethod() == 'POST') {
            res.setBody('{"id":"123"}'); // Set the body as per your requirement for POST
            res.setStatusCode(201);
        }
        return res; 
    }
}