diff --git a/laser_encoders/test_laser_tokenizer.py b/laser_encoders/test_laser_tokenizer.py
index 08ad789e..5a60c7e3 100644
--- a/laser_encoders/test_laser_tokenizer.py
+++ b/laser_encoders/test_laser_tokenizer.py
@@ -20,6 +20,7 @@
 
 import numpy as np
 import pytest
+import warnings
 
 from laser_encoders import (
     LaserEncoderPipeline,
@@ -285,3 +286,18 @@ def test_encoder_non_normalization(tmp_path: Path, test_readme_params: dict):
     norm = np.linalg.norm(non_normalized_embeddings[0])
 
     assert not np.isclose(norm, 1)
+
+
+def test_optional_lang_with_laser2(tmp_path: Path):
+    with pytest.warns(UserWarning, match="The 'lang' parameter is optional when using 'laser2'. It will be ignored."):
+        encoder = LaserEncoderPipeline(lang="en", laser="laser2", model_dir=tmp_path)
+
+
+def test_required_lang_with_laser3(tmp_path: Path):
+    with pytest.raises(ValueError, match="For 'laser3', the 'lang' parameter is required."):
+        encoder = LaserEncoderPipeline(laser="laser3", model_dir=tmp_path)
+
+
+def test_missing_lang_and_laser(tmp_path: Path):
+    with pytest.raises(ValueError, match="Either 'laser' or 'lang' should be provided."):
+        encoder = LaserEncoderPipeline(model_dir=tmp_path)