Add local test catching ^J

Author: johnslavik

Lib/test/test_pdb.py

@@ -4996,6 +4996,16 @@ def test_code_display(self):
         p.set_trace(commands=['ll', 'c'])
         self.assertNotIn("\x1b", output.getvalue())
 
+    def test_list_does_not_colorize_trailing_newlines(self):
+        # Keep the marker split so it is not present in the listed source.
+        caret_newline = "^" + "J"
+        output = io.StringIO()
+        p = pdb.Pdb(stdout=output, colorize=True)
+        p.set_trace(commands=['list', 'continue'])
+        result = output.getvalue()
+        self.assertIn("\x1b", result)
+        self.assertNotIn(caret_newline, result)
+
     def test_stack_entry(self):
         output = io.StringIO()
         p = pdb.Pdb(stdout=output, colorize=True)