server: tests: output server logs in text

examples/server/tests/README.md

@@ -32,6 +32,7 @@ It's possible to override some scenario steps values with environment variables:
  - `PORT` -> `context.server_port` to set the listening port of the server during scenario, default: `8080`
  - `LLAMA_SERVER_BIN_PATH` -> to change the server binary path, default: `../../../build/bin/server`
  - `DEBUG` -> "ON" to enable steps and server verbose mode `--verbose`
+ - `SERVER_LOG_FORMAT_JSON` -> if set switch server logs to json format
 
 ### Run @bug, @wip or @wrong_usage annotated scenario
 

examples/server/tests/features/steps/steps.py

@@ -765,6 +765,8 @@ def start_server_background(context):
         server_args.extend(['--api-key', context.server_api_key])
     if context.debug:
         server_args.append('--verbose')
+    if 'SERVER_LOG_FORMAT_JSON' not in os.environ:
+        server_args.extend(['--log-format', "text"])
     print(f"starting server with: {context.server_path}", *server_args)
     context.server_process = subprocess.Popen(
         [str(arg) for arg in [context.server_path, *server_args]],