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from __future__ import annotations
import sys
from contextlib import redirect_stderr, redirect_stdout
from io import StringIO
import pytest
from pybind11_tests import iostream as m
def test_captured(capsys):
msg = "I've been redirected to Python, I hope!"
m.captured_output(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
m.captured_err(msg)
stdout, stderr = capsys.readouterr()
assert not stdout
assert stderr == msg
def test_captured_large_string(capsys):
# Make this bigger than the buffer used on the C++ side: 1024 chars
msg = "I've been redirected to Python, I hope!"
msg = msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_2byte_offset0(capsys):
msg = "\u07ff"
msg = "" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_2byte_offset1(capsys):
msg = "\u07ff"
msg = "1" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_3byte_offset0(capsys):
msg = "\uffff"
msg = "" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_3byte_offset1(capsys):
msg = "\uffff"
msg = "1" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_3byte_offset2(capsys):
msg = "\uffff"
msg = "12" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_4byte_offset0(capsys):
msg = "\U0010ffff"
msg = "" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_4byte_offset1(capsys):
msg = "\U0010ffff"
msg = "1" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_4byte_offset2(capsys):
msg = "\U0010ffff"
msg = "12" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_captured_utf8_4byte_offset3(capsys):
msg = "\U0010ffff"
msg = "123" + msg * (1024 // len(msg) + 1)
m.captured_output_default(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_guard_capture(capsys):
msg = "I've been redirected to Python, I hope!"
m.guard_output(msg)
stdout, stderr = capsys.readouterr()
assert stdout == msg
assert not stderr
def test_series_captured(capture):
with capture:
m.captured_output("a")
m.captured_output("b")
assert capture == "ab"
def test_flush(capfd):
msg = "(not flushed)"
msg2 = "(flushed)"
with m.ostream_redirect():
m.noisy_function(msg, flush=False)
stdout, stderr = capfd.readouterr()
assert not stdout
m.noisy_function(msg2, flush=True)
stdout, stderr = capfd.readouterr()
assert stdout == msg + msg2
m.noisy_function(msg, flush=False)
stdout, stderr = capfd.readouterr()
assert stdout == msg
def test_not_captured(capfd):
msg = "Something that should not show up in log"
stream = StringIO()
with redirect_stdout(stream):
m.raw_output(msg)
stdout, stderr = capfd.readouterr()
assert stdout == msg
assert not stderr
assert not stream.getvalue()
stream = StringIO()
with redirect_stdout(stream):
m.captured_output(msg)
stdout, stderr = capfd.readouterr()
assert not stdout
assert not stderr
assert stream.getvalue() == msg
def test_err(capfd):
msg = "Something that should not show up in log"
stream = StringIO()
with redirect_stderr(stream):
m.raw_err(msg)
stdout, stderr = capfd.readouterr()
assert not stdout
assert stderr == msg
assert not stream.getvalue()
stream = StringIO()
with redirect_stderr(stream):
m.captured_err(msg)
stdout, stderr = capfd.readouterr()
assert not stdout
assert not stderr
assert stream.getvalue() == msg
def test_multi_captured(capfd):
stream = StringIO()
with redirect_stdout(stream):
m.captured_output("a")
m.raw_output("b")
m.captured_output("c")
m.raw_output("d")
stdout, stderr = capfd.readouterr()
assert stdout == "bd"
assert stream.getvalue() == "ac"
def test_dual(capsys):
m.captured_dual("a", "b")
stdout, stderr = capsys.readouterr()
assert stdout == "a"
assert stderr == "b"
def test_redirect(capfd):
msg = "Should not be in log!"
stream = StringIO()
with redirect_stdout(stream):
m.raw_output(msg)
stdout, stderr = capfd.readouterr()
assert stdout == msg
assert not stream.getvalue()
stream = StringIO()
with redirect_stdout(stream), m.ostream_redirect():
m.raw_output(msg)
stdout, stderr = capfd.readouterr()
assert not stdout
assert stream.getvalue() == msg
stream = StringIO()
with redirect_stdout(stream):
m.raw_output(msg)
stdout, stderr = capfd.readouterr()
assert stdout == msg
assert not stream.getvalue()
def test_redirect_err(capfd):
msg = "StdOut"
msg2 = "StdErr"
stream = StringIO()
with redirect_stderr(stream), m.ostream_redirect(stdout=False):
m.raw_output(msg)
m.raw_err(msg2)
stdout, stderr = capfd.readouterr()
assert stdout == msg
assert not stderr
assert stream.getvalue() == msg2
def test_redirect_both(capfd):
msg = "StdOut"
msg2 = "StdErr"
stream = StringIO()
stream2 = StringIO()
with redirect_stdout(stream), redirect_stderr(stream2), m.ostream_redirect():
m.raw_output(msg)
m.raw_err(msg2)
stdout, stderr = capfd.readouterr()
assert not stdout
assert not stderr
assert stream.getvalue() == msg
assert stream2.getvalue() == msg2
@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
def test_threading():
with m.ostream_redirect(stdout=True, stderr=False):
# start some threads
threads = []
# start some threads
for _j in range(20):
threads.append(m.TestThread())
# give the threads some time to fail
threads[0].sleep()
# stop all the threads
for t in threads:
t.stop()
for t in threads:
t.join()
# if a thread segfaults, we don't get here
assert True
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