diff --git a/nixos/tests/jellyfin.nix b/nixos/tests/jellyfin.nix
index 65360624d4875f..f8c2429a7b8d80 100644
--- a/nixos/tests/jellyfin.nix
+++ b/nixos/tests/jellyfin.nix
@@ -1,16 +1,156 @@
-import ./make-test-python.nix ({ lib, ...}:
-
-{
-  name = "jellyfin";
-  meta.maintainers = with lib.maintainers; [ minijackson ];
-
-  machine =
-    { ... }:
-    { services.jellyfin.enable = true; };
-
-  testScript = ''
-    machine.wait_for_unit("jellyfin.service")
-    machine.wait_for_open_port(8096)
-    machine.succeed("curl --fail http://localhost:8096/")
-  '';
-})
+import ./make-test-python.nix ({ lib, pkgs, ... }:
+
+  {
+    name = "jellyfin";
+    meta.maintainers = with lib.maintainers; [ minijackson ];
+
+    machine =
+      { ... }:
+      {
+        services.jellyfin.enable = true;
+        environment.systemPackages = with pkgs; [ ffmpeg ];
+      };
+
+    # Documentation of the Jellyfin API: https://api.jellyfin.org/
+    # Beware, this link can be resource intensive
+    testScript =
+      let
+        payloads = {
+          auth = pkgs.writeText "auth.json" (builtins.toJSON {
+            Username = "jellyfin";
+          });
+          empty = pkgs.writeText "empty.json" (builtins.toJSON { });
+        };
+      in
+      ''
+        import json
+        import time
+        from urllib.parse import urlencode
+
+        machine.wait_for_unit("jellyfin.service")
+        machine.wait_for_open_port(8096)
+        machine.succeed("curl --fail http://localhost:8096/")
+
+        machine.wait_until_succeeds("curl --fail http://localhost:8096/health | grep Healthy")
+
+        auth_header = 'MediaBrowser Client="NixOS Integration Tests", DeviceId="1337", Device="Apple II", Version="20.09"'
+
+
+        def api_get(path):
+            return f"curl --fail 'http://localhost:8096{path}' -H 'X-Emby-Authorization:{auth_header}'"
+
+
+        def api_post(path, json_file=None):
+            if json_file:
+                return f"curl --fail -X post 'http://localhost:8096{path}' -d '@{json_file}' -H Content-Type:application/json -H 'X-Emby-Authorization:{auth_header}'"
+            else:
+                return f"curl --fail -X post 'http://localhost:8096{path}' -H 'X-Emby-Authorization:{auth_header}'"
+
+
+        with machine.nested("Wizard completes"):
+            machine.wait_until_succeeds(api_get("/Startup/Configuration"))
+            machine.succeed(api_get("/Startup/FirstUser"))
+            machine.succeed(api_post("/Startup/Complete"))
+
+        with machine.nested("Can login"):
+            auth_result = machine.succeed(
+                api_post(
+                    "/Users/AuthenticateByName",
+                    "${payloads.auth}",
+                )
+            )
+            auth_result = json.loads(auth_result)
+            auth_token = auth_result["AccessToken"]
+            auth_header += f", Token={auth_token}"
+
+            sessions_result = machine.succeed(api_get("/Sessions"))
+            sessions_result = json.loads(sessions_result)
+
+            this_session = [
+                session for session in sessions_result if session["DeviceId"] == "1337"
+            ]
+            if len(this_session) != 1:
+                raise Exception("Session not created")
+
+            me = machine.succeed(api_get("/Users/Me"))
+            me = json.loads(me)["Id"]
+
+        with machine.nested("Can add library"):
+            tempdir = machine.succeed("mktemp -d -p /var/lib/jellyfin").strip()
+            machine.succeed(f"chmod 755 '{tempdir}'")
+
+            # Generate a dummy video that we can test later
+            videofile = f"{tempdir}/Big Buck Bunny (2008) [1080p].mkv"
+            machine.succeed(f"ffmpeg -f lavfi -i testsrc2=duration=5 '{videofile}'")
+
+            add_folder_query = urlencode(
+                {
+                    "name": "My Library",
+                    "collectionType": "Movies",
+                    "paths": tempdir,
+                    "refreshLibrary": "true",
+                }
+            )
+
+            machine.succeed(
+                api_post(
+                    f"/Library/VirtualFolders?{add_folder_query}",
+                    "${payloads.empty}",
+                )
+            )
+
+
+        def is_refreshed(_):
+            folders = machine.succeed(api_get(f"/Library/VirtualFolders"))
+            folders = json.loads(folders)
+            print(folders)
+            return all(folder["RefreshStatus"] == "Idle" for folder in folders)
+
+
+        retry(is_refreshed)
+
+        with machine.nested("Can identify videos"):
+            items = []
+
+            # For some reason, having the folder refreshed doesn't mean the
+            # movie was scanned
+            def has_movie(_):
+                global items
+
+                items = machine.succeed(
+                    api_get(f"/Users/{me}/Items?IncludeItemTypes=Movie&Recursive=true")
+                )
+                items = json.loads(items)["Items"]
+
+                return len(items) == 1
+
+            retry(has_movie)
+
+            video = items[0]["Id"]
+
+            item_info = machine.succeed(api_get(f"/Users/{me}/Items/{video}"))
+            item_info = json.loads(item_info)
+
+            if item_info["Name"] != "Big Buck Bunny":
+                raise Exception("Jellyfin failed to properly identify file")
+
+        with machine.nested("Can read videos"):
+            media_source_id = item_info["MediaSources"][0]["Id"]
+
+            machine.succeed(
+                "ffmpeg"
+                + f" -headers 'X-Emby-Authorization:{auth_header}'"
+                + f" -i http://localhost:8096/Videos/{video}/master.m3u8?mediaSourceId={media_source_id}"
+                + f" /tmp/test.mkv"
+            )
+
+            duration = machine.succeed(
+                "ffprobe /tmp/test.mkv"
+                + " -show_entries format=duration"
+                + " -of compact=print_section=0:nokey=1"
+            )
+
+            if duration.strip() != "5.000000":
+                raise Exception("Downloaded video has wrong duration")
+      '';
+  })