POSIX serial.flush blocks the test cases #654
Description
Hey there,
Somehow this line block the test run forever on mac at least https://github.com/pyserial/pyserial/blob/master/test/test_pty.py#L47, to be specific termios.tcdrain call. Any idea why! or shall we just remove it.
(venv) ➜ pyserial git:(master) ✗ python --version
Python 3.9.13(venv) ➜ pyserial git:(master) ✗ sw_vers
ProductName: macOS
ProductVersion: 12.4Without flush call
(venv) ➜ pyserial git:(master) ✗ python test/run_all_tests.py loop://
Patching sys.path to test local version. Testing Version: 3.5
found 2 tests in 'test_threaded'
found 10 tests in 'test_advanced'
found 5 tests in 'test_readline'
found 2 tests in 'test_rs485'
found 1 tests in 'test_iolib'
found 0 tests in 'test_asyncio'
found 15 tests in 'test'
found 2 tests in 'test_util'
found 2 tests in 'test_high_load'
found 4 tests in 'test_timeout_class'
found 1 tests in 'test_rfc2217'
found 4 tests in 'test_exclusive'
found 2 tests in 'test_cancel'
found 1 tests in 'test_context'
found 3 tests in 'test_url'
found 4 tests in 'test_settings_dict'
found 3 tests in 'test_pty'
.................s..........................ssss.............
----------------------------------------------------------------------
Ran 61 tests in 31.894s
OK (skipped=5)With flush call
(venv) ➜ pyserial git:(master) ✗ python test/run_all_tests.py loop://
Patching sys.path to test local version. Testing Version: 3.5
found 2 tests in 'test_threaded'
found 10 tests in 'test_advanced'
found 5 tests in 'test_readline'
found 2 tests in 'test_rs485'
found 1 tests in 'test_iolib'
found 0 tests in 'test_asyncio'
found 15 tests in 'test'
found 2 tests in 'test_util'
found 2 tests in 'test_high_load'
found 4 tests in 'test_timeout_class'
found 1 tests in 'test_rfc2217'
found 4 tests in 'test_exclusive'
found 2 tests in 'test_cancel'
found 1 tests in 'test_context'
found 3 tests in 'test_url'
found 4 tests in 'test_settings_dict'
found 3 tests in 'test_pty'
.................s..........................ssss...........