diff --git a/examples/no-color.md b/examples/no-color.md
index 283ea45d0..b51ac6b98 100644
--- a/examples/no-color.md
+++ b/examples/no-color.md
@@ -8,6 +8,8 @@ GPT figures out which files need to be edited, and asks permission to make chang
 It then disables all the color and pretty-printing functions if NO_COLOR is
 set, so the tool conforms to the specification.
 
+The user then asks for a test case, which GPT adds as well.
+
 ## Chat transcript
 > $ aider  
 > Using git repo: .git  
@@ -103,3 +105,52 @@ These changes will make the software check for the `NO_COLOR` environment variab
 > Applied edit to aider/io.py  
 > Applied edit to aider/io.py  
 > Commit 3218242 aider: Added check for NO_COLOR environment variable to disable ANSI color.  
+
+#### add a test
+
+To add a test for the `NO_COLOR` environment variable, we will create a new test function in the `tests/test_io.py` file. Since this file does not exist, we will create it first.
+
+```python
+tests/test_io.py
+<<<<<<< ORIGINAL
+=======
+import os
+import unittest
+from unittest.mock import patch
+from aider.io import InputOutput
+
+class TestInputOutput(unittest.TestCase):
+    def test_no_color_environment_variable(self):
+        with patch.dict(os.environ, {"NO_COLOR": "1"}):
+            io = InputOutput()
+            self.assertFalse(io.pretty)
+
+if __name__ == "__main__":
+    unittest.main()
+>>>>>>> UPDATED
+```
+
+This test function checks if the `pretty` attribute of the `InputOutput` class is set to `False` when the `NO_COLOR` environment variable is set.
+
+> Allow creation of new file tests/test_io.py? y  
+> Add tests/test_io.py to git? y  
+> Applied edit to tests/test_io.py  
+> Commit 52a9df5 aider: Added a test function to check if the `pretty` attribute of the `InputOutput` class is set to `False` when the `NO_COLOR` environment variable is set.  
+
+#### /run pytest
+
+> ============================= test session starts ==============================  
+> platform darwin -- Python 3.11.3, pytest-7.3.1, pluggy-1.0.0  
+> rootdir: /Users/gauthier/Projects/aider  
+> collected 25 items  
+>   
+> tests/test_coder.py ......                                               [ 24%]  
+> tests/test_commands.py .                                                 [ 28%]  
+> tests/test_io.py .                                                       [ 32%]  
+> tests/test_main.py ....                                                  [ 48%]  
+> tests/test_repomap.py ...                                                [ 60%]  
+> tests/test_utils.py ..........                                           [100%]  
+>   
+> ============================== 25 passed in 1.41s ==============================
+>  
+> Add the output to the chat? y