Issue #19884: readline: Disable the meta modifier key if stdout is not a

terminal to not write the ANSI sequence "\033[1034h" into stdout. This sequence
is used on some terminal (ex: TERM=xterm-256color") to enable support of 8 bit
characters.

1 files changed, 18 insertions, 5 deletions

diff --git a/Lib/test/test_readline.py b/Lib/test/test_readline.py
index 5483dd3..8b77818 100644
--- a/Lib/test/test_readline.py
+++ b/Lib/test/test_readline.py
@@ -1,17 +1,20 @@
 """
 Very minimal unittests for parts of the readline module.
-
-These tests were added to check that the libedit emulation on OSX and
-the "real" readline have the same interface for history manipulation. That's
-why the tests cover only a small subset of the interface.
 """
+import os
 import unittest
 from test.support import run_unittest, import_module
+from test.script_helper import assert_python_ok
 
 # Skip tests if there is no readline module
 readline = import_module('readline')
 
 class TestHistoryManipulation (unittest.TestCase):
+    """
+    These tests were added to check that the libedit emulation on OSX and the
+    "real" readline have the same interface for history manipulation. That's
+    why the tests cover only a small subset of the interface.
+    """
 
     @unittest.skipIf(not hasattr(readline, 'clear_history'),
                      "The history update test cannot be run because the "
@@ -40,8 +43,18 @@ class TestHistoryManipulation (unittest.TestCase):
         self.assertEqual(readline.get_current_history_length(), 1)
 
 
+class TestReadline(unittest.TestCase):
+    def test_init(self):
+        # Issue #19884: Ensure that the ANSI sequence "\033[1034h" is not
+        # written into stdout when the readline module is imported and stdout
+        # is redirected to a pipe.
+        rc, stdout, stderr = assert_python_ok('-c', 'import readline',
+                                              TERM='xterm-256color')
+        self.assertEqual(stdout, b'')
+
+
 def test_main():
-    run_unittest(TestHistoryManipulation)
+    run_unittest(TestHistoryManipulation, TestReadline)
 
 if __name__ == "__main__":
     test_main()