Introduce unit tests (#248)

* Proof-of-concept: unittests

* Add pytest-asyncio dep

* Import Body from stream

* Add test for allow_extra_tracks

* Cleanup decorators

* add test to linting

* fix ruff issues

* Run formatter

* fix

* Dont test every python version

---------

Co-authored-by: Marcus Valtonen Örnhag <marcus.valtonen.ornhag@ericsson.com>
Co-authored-by: Freddy Boulton <alfonsoboulton@gmail.com>

frontend/Index.svelte

@@ -73,6 +73,11 @@
         "error",
         `Too many concurrent connections. Please try again later!`,
       );
+    } else if (
+      msg.status === "failed" &&
+      msg.meta?.error === "connection_already_exists"
+    ) {
+      gradio.dispatch("error", "Connection already exists");
     } else {
       gradio.dispatch("error", "Unexpected server error");
     }