tests : improve "tokens" type check

Co-authored-by: Xuan Son Nguyen <[email protected]>

Author: ggerganov

examples/server/tests/unit/test_completion.py

@@ -29,7 +29,8 @@ def test_completion(prompt: str, n_predict: int, re_content: str, n_prompt: int,
     assert type(res.body["has_new_line"]) == bool
     assert match_regex(re_content, res.body["content"])
     if return_tokens:
-        assert res.body["tokens"] != []
+        assert len(res.body["tokens"]) > 0
+        assert all(type(tok) == int for tok in res.body["tokens"])
     else:
         assert res.body["tokens"] == []