74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
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# Copyright 2023 The Pigweed Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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"""Tests for pw_cli.process."""
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import unittest
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import sys
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import textwrap
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from pw_cli import process
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import psutil # type: ignore
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FAST_TIMEOUT_SECONDS = 0.1
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KILL_SIGNALS = set({-9, 137})
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PYTHON = sys.executable
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class RunTest(unittest.TestCase):
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"""Tests for process.run."""
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def test_returns_output(self) -> None:
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echo_str = 'foobar'
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print_str = f'print("{echo_str}")'
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result = process.run(PYTHON, '-c', print_str)
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self.assertEqual(result.output, b'foobar\n')
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def test_timeout_kills_process(self) -> None:
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sleep_100_seconds = 'import time; time.sleep(100)'
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result = process.run(
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PYTHON, '-c', sleep_100_seconds, timeout=FAST_TIMEOUT_SECONDS
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)
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self.assertIn(result.returncode, KILL_SIGNALS)
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def test_timeout_kills_subprocess(self) -> None:
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# Spawn a subprocess which waits for 100 seconds, print its pid,
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# then wait for 100 seconds.
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sleep_in_subprocess = textwrap.dedent(
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f"""
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import subprocess
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import time
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child = subprocess.Popen(
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['{PYTHON}', '-c', 'import time; print("booh"); time.sleep(100)']
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)
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print(child.pid, flush=True)
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time.sleep(100)
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"""
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)
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result = process.run(
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PYTHON, '-c', sleep_in_subprocess, timeout=FAST_TIMEOUT_SECONDS
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)
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self.assertIn(result.returncode, KILL_SIGNALS)
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# THe first line of the output is the PID of the child sleep process.
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child_pid_str, sep, remainder = result.output.partition(b'\n')
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del sep, remainder
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child_pid = int(child_pid_str)
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self.assertFalse(psutil.pid_exists(child_pid))
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if __name__ == '__main__':
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unittest.main()
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