diff --git a/tests/test_structs.py b/tests/test_structs.py
index f1b9625e..058fcdf2 100644
--- a/tests/test_structs.py
+++ b/tests/test_structs.py
@@ -1,3 +1,4 @@
+from bionetgen.modelapi.structs import Action
 import pytest
 from bionetgen.modelapi.structs import ModelObj
 
@@ -43,6 +44,24 @@ def test_modelobj_line_label_setter():
     assert obj.line_label == "[1, 2, 3]: "
 
 
+def test_action_print_line():
+    action = Action(action_type="simulate", action_args={"method": "ode", "t_end": 10})
+    # Basic print_line without comment or label
+    assert action.print_line() == "simulate({method=>ode,t_end=>10})"
+
+    # Print with line label
+    action.line_label = 1
+    assert action.print_line() == "1 simulate({method=>ode,t_end=>10})"
+
+    # Print with comment
+    action.comment = "test comment"
+    assert action.print_line() == "1 simulate({method=>ode,t_end=>10}) #test comment"
+
+    # Print with comment but no label
+    action._line_label = None
+    assert action.print_line() == "simulate({method=>ode,t_end=>10}) #test comment"
+
+
 def test_action_gen_string():
     from bionetgen.modelapi.structs import Action