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# Helper module to use the Hypothesis tool in tests
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#
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# Copyright 2015 David R. MacIver
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#
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# For details see http://hypothesis.readthedocs.org
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import os
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import sys
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import traceback
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try:
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# hypothesis 2.x
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from hypothesis.configuration import set_hypothesis_home_dir
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from hypothesis import settings
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except ImportError:
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# hypothesis 1.x
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from hypothesis.settings import set_hypothesis_home_dir
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from hypothesis import Settings as settings
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import hypothesis.strategies as st
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from hypothesis import given
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# hypothesis store data regarding generate example and code
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set_hypothesis_home_dir(os.path.join(
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os.getenv('TESTTMP'), ".hypothesis"
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))
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def check(*args, **kwargs):
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"""decorator to make a function a hypothesis test
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Decorated function are run immediately (to be used doctest style)"""
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def accept(f):
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# Workaround for https://github.com/DRMacIver/hypothesis/issues/206
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# Fixed in version 1.13 (released 2015 october 29th)
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f.__module__ = '__anon__'
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try:
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with settings(max_examples=2000):
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given(*args, **kwargs)(f)()
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except Exception:
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traceback.print_exc(file=sys.stdout)
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sys.exit(1)
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return accept
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def roundtrips(data, decode, encode):
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"""helper to tests function that must do proper encode/decode roundtripping
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"""
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@given(data)
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def testroundtrips(value):
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encoded = encode(value)
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decoded = decode(encoded)
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if decoded != value:
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raise ValueError(
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"Round trip failed: %s(%r) -> %s(%r) -> %r" % (
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encode.__name__, value, decode.__name__, encoded,
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decoded
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))
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try:
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testroundtrips()
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except Exception:
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# heredoc swallow traceback, we work around it
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traceback.print_exc(file=sys.stdout)
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raise
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print("Round trip OK")
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# strategy for generating bytestring that might be an issue for Mercurial
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bytestrings = (
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st.builds(lambda s, e: s.encode(e), st.text(), st.sampled_from([
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'utf-8', 'utf-16',
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]))) | st.binary()
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