29 lines
1.3 KiB
Python
29 lines
1.3 KiB
Python
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import sys
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import unittest
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from gevent import testing as greentest
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class TestSubnormalFloatsAreNotDisabled(unittest.TestCase):
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@greentest.skipOnCI('Some of our tests we compile with -Ofast, which breaks this.')
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def test_subnormal_is_not_zero(self):
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# Enabling the -Ofast compiler flag resulted in subnormal floats getting
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# disabled the moment when gevent was imported. This impacted libraries
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# that expect subnormal floats to be enabled.
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#
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# NOTE: This test is supposed to catch that. It doesn't seem to work perfectly, though.
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# The test passes under Python 2 on macOS no matter whether -ffast-math is given or not;
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# perhaps this is a difference in clang vs gcc? In contrast, the test on Python 2.7 always
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# *fails* on GitHub actions (in both CPython 2.7 and PyPy). We're far past the EOL of
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# Python 2.7 so I'm not going to spend much time investigating.
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__import__('gevent')
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# `sys.float_info.min` is the minimum representable positive normalized
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# float, so dividing it by two gives us a positive subnormal float,
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# as long as subnormals floats are not disabled.
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self.assertGreater(sys.float_info.min / 2, 0.0)
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if __name__ == "__main__":
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unittest.main()
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