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65 lines
2.3 KiB
Python
65 lines
2.3 KiB
Python
from math import copysign, isnan
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class ExceptionIsLikeMixin:
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def assertExceptionIsLike(self, exc, template):
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"""
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Passes when the provided `exc` matches the structure of `template`.
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Individual exceptions don't have to be the same objects or even pass
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an equality test: they only need to be the same type and contain equal
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`exc_obj.args`.
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"""
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if exc is None and template is None:
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return
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if template is None:
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self.fail(f"unexpected exception: {exc}")
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if exc is None:
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self.fail(f"expected an exception like {template!r}, got None")
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if not isinstance(exc, ExceptionGroup):
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self.assertEqual(exc.__class__, template.__class__)
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self.assertEqual(exc.args[0], template.args[0])
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else:
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self.assertEqual(exc.message, template.message)
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self.assertEqual(len(exc.exceptions), len(template.exceptions))
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for e, t in zip(exc.exceptions, template.exceptions):
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self.assertExceptionIsLike(e, t)
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class FloatsAreIdenticalMixin:
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def assertFloatsAreIdentical(self, x, y):
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"""Fail unless floats x and y are identical, in the sense that:
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(1) both x and y are nans, or
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(2) both x and y are infinities, with the same sign, or
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(3) both x and y are zeros, with the same sign, or
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(4) x and y are both finite and nonzero, and x == y
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"""
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msg = 'floats {!r} and {!r} are not identical'
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if isnan(x) or isnan(y):
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if isnan(x) and isnan(y):
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return
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elif x == y:
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if x != 0.0:
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return
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# both zero; check that signs match
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elif copysign(1.0, x) == copysign(1.0, y):
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return
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else:
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msg += ': zeros have different signs'
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self.fail(msg.format(x, y))
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class ComplexesAreIdenticalMixin(FloatsAreIdenticalMixin):
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def assertComplexesAreIdentical(self, x, y):
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"""Fail unless complex numbers x and y have equal values and signs.
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In particular, if x and y both have real (or imaginary) part
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zero, but the zeros have different signs, this test will fail.
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"""
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self.assertFloatsAreIdentical(x.real, y.real)
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self.assertFloatsAreIdentical(x.imag, y.imag)
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