test_session_not_found_goes_to_stdout_in_full_mode passes in isolation but
fails in a full tests/cli run. Two independent leaks from the same neighbor
test conspire:
1. test_cli_init.py's _make_cli() reloads cli.py while prompt_toolkit is
stubbed with MagicMocks and never reloads it back, so sys.modules['cli']
is left with a mock _pt_print/_PT_ANSI and cli._cprint silently no-ops
for every later test. Fixed by reloading cli once more with the real
modules visible (try/finally).
2. prompt_toolkit's print_formatted_text caches its Output on the
process-global default AppSession the first time it renders without an
explicit output=. Under capsys (which swaps sys.stdout per test), the
first CLI test to emit through _cprint locks that cache onto its own
captured stdout, so later capsys tests read an empty buffer. Fixed with
an autouse fixture in a new tests/cli/conftest.py that resets the cached
output around each test.
Neither change touches production code or the flaky test's own assertion.
Related to #59358 (which addresses the same flaky test by mocking _cprint in
the assertion instead; this fixes the two underlying leaks at the source and
does not modify test_resume_quiet_stderr.py).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
