test: add a new step test

Author: Joan Martinez

examples/server/tests/features/embeddings.feature

@@ -23,6 +23,13 @@ Feature: llama.cpp server
     """
     Then embeddings are generated
 
+  Scenario: Tokenize / Detokenize complex
+    When tokenizing:
+    """
+    España is a èspciâl world in cañas and Barça has the best 例子
+    """
+    Then tokens can be detokenize
+
   Scenario: OAI Embeddings compatibility
     Given a model bert-bge-small
     When an OAI compatible embeddings computation request for: