test for passing unmatched requests

tests/test_aioresponses.py

@@ -783,3 +783,18 @@ async def test_relative_url_redirect_followed(self, rsps):
         self.assertEqual(str(response.url), f"{base_url}/baz")
         self.assertEqual(len(response.history), 1)
         self.assertEqual(str(response.history[0].url), url)
+
+    async def test_pass_through_unmatched_requests(self):
+        matched_url = "https://matched_example.org"
+        unmatched_url = "https://httpbin.org/get"
+        params_unmatched = {'foo': 'bar'}
+
+        with aioresponses(passthrough_unmatched=True) as m:
+            m.post(URL(matched_url), status=200)
+            mocked_response = await self.session.post(URL(matched_url))
+            response = await self.session.get(
+                URL(unmatched_url), params=params_unmatched
+            )
+            self.assertEqual(response.status, 200)
+            self.assertEqual(str(response.url), 'https://httpbin.org/get?foo=bar')
+            self.assertEqual(mocked_response.status, 200)