add(quora/tests): Added a module with quora tests.

It is covering 3 scenarios:
1. test_successful_request
2. test_exponential backoff
3. test_too_many_requests

Run tests: python -m unittest gpt4free/quora/tests/test_api.py

gpt4free/quora/tests/test_api.py

@@ -0,0 +1,38 @@
+import unittest
+import requests
+from unittest.mock import MagicMock
+from gpt4free.quora.api import retry_request
+
+
+class TestRetryRequest(unittest.TestCase):
+    def test_successful_request(self):
+        # Mock a successful request with a 200 status code
+        mock_response = MagicMock()
+        mock_response.status_code = 200
+        requests.get = MagicMock(return_value=mock_response)
+
+        # Call the function and assert that it returns the response
+        response = retry_request(requests.get, "http://example.com", max_attempts=3)
+        self.assertEqual(response.status_code, 200)
+
+    def test_exponential_backoff(self):
+        # Mock a failed request that succeeds after two retries
+        mock_response = MagicMock()
+        mock_response.status_code = 200
+        requests.get = MagicMock(side_effect=[requests.exceptions.RequestException] * 2 + [mock_response])
+
+        # Call the function and assert that it retries with exponential backoff
+        with self.assertLogs() as logs:
+            response = retry_request(requests.get, "http://example.com", max_attempts=3, delay=1)
+            self.assertEqual(response.status_code, 200)
+            self.assertGreaterEqual(len(logs.output), 2)
+            self.assertIn("Retrying in 1 seconds...", logs.output[0])
+            self.assertIn("Retrying in 2 seconds...", logs.output[1])
+
+    def test_too_many_attempts(self):
+        # Mock a failed request that never succeeds
+        requests.get = MagicMock(side_effect=requests.exceptions.RequestException)
+
+        # Call the function and assert that it raises an exception after the maximum number of attempts
+        with self.assertRaises(RuntimeError):
+            retry_request(requests.get, "http://example.com", max_attempts=3)