65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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"""Test pyvisa utility functions that requires a VISA library to be tested.
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"""
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import logging
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from io import StringIO
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import pyvisa
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from pyvisa.testsuite import BaseTestCase
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class TestLoggingUtilities(BaseTestCase):
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"""Test standard logging utilities for pyvisa."""
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def teardown_method(self):
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for h in pyvisa.logger.handlers:
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if not isinstance(h, logging.NullHandler):
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pyvisa.logger.removeHandler(h)
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def test_log_to_stream(self):
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"""Test redirecting the log to a custom stream."""
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stream = StringIO()
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debug_stream = StringIO()
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pyvisa.log_to_stream(stream, level=logging.INFO)
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pyvisa.log_to_stream(debug_stream)
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pyvisa.logger.debug("debug test")
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pyvisa.logger.info("info test")
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assert "debug test" in debug_stream.getvalue()
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assert "debug test" not in stream.getvalue()
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assert "info test" in debug_stream.getvalue()
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assert "info test" in stream.getvalue()
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def test_log_to_screen(self):
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"""Test redirecting the log to stderr.
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Capture of stderr seems unreliable so avoid it
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"""
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self._log_to_screen_helper(logging.DEBUG)
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def test_log_to_screen_custom_level(self):
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"""Test redirecting the log to stdout."""
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self._log_to_screen_helper(logging.INFO)
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def _log_to_screen_helper(self, level):
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class Faker:
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def __init__(self):
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self.args = None
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def log_to_stream(self, *args):
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self.args = args
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faker = Faker()
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try:
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old = pyvisa.log_to_stream
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pyvisa.log_to_stream = faker.log_to_stream
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if level != logging.DEBUG:
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pyvisa.log_to_screen(level)
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else:
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pyvisa.log_to_screen()
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finally:
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pyvisa.log_to_stream = old
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assert faker.args == (None, level)
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