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-rw-r--r--src/prompt_toolkit/application/current.py12
1 files changed, 9 insertions, 3 deletions
diff --git a/src/prompt_toolkit/application/current.py b/src/prompt_toolkit/application/current.py
index 908141a..7e2cf48 100644
--- a/src/prompt_toolkit/application/current.py
+++ b/src/prompt_toolkit/application/current.py
@@ -147,11 +147,17 @@ def create_app_session(
Like in the case of an Telnet/SSH server.
"""
# If no input/output is specified, fall back to the current input/output,
- # whatever that is.
+ # if there was one that was set/created for the current session.
+ # (Note that we check `_input`/`_output` and not `input`/`output`. This is
+ # because we don't want to accidently create a new input/output objects
+ # here and store it in the "parent" `AppSession`. Especially, when
+ # combining pytest's `capsys` fixture and `create_app_session`, sys.stdin
+ # and sys.stderr are patched for every test, so we don't want to leak
+ # those outputs object across `AppSession`s.)
if input is None:
- input = get_app_session().input
+ input = get_app_session()._input
if output is None:
- output = get_app_session().output
+ output = get_app_session()._output
# Create new `AppSession` and activate.
session = AppSession(input=input, output=output)