508 lines
18 KiB
Python
508 lines
18 KiB
Python
import doctest
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import operator
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from decimal import Decimal
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from fractions import Fraction
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from operator import eq
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from operator import ne
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import pytest
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from pytest import approx
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inf, nan = float("inf"), float("nan")
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class MyDocTestRunner(doctest.DocTestRunner):
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def __init__(self):
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doctest.DocTestRunner.__init__(self)
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def report_failure(self, out, test, example, got):
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raise AssertionError(
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"'{}' evaluates to '{}', not '{}'".format(
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example.source.strip(), got.strip(), example.want.strip()
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)
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)
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class TestApprox:
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@pytest.fixture
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def plus_minus(self):
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return "\u00b1"
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def test_repr_string(self, plus_minus):
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tol1, tol2, infr = "1.0e-06", "2.0e-06", "inf"
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assert repr(approx(1.0)) == "1.0 {pm} {tol1}".format(pm=plus_minus, tol1=tol1)
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assert repr(
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approx([1.0, 2.0])
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) == "approx([1.0 {pm} {tol1}, 2.0 {pm} {tol2}])".format(
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pm=plus_minus, tol1=tol1, tol2=tol2
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)
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assert repr(
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approx((1.0, 2.0))
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) == "approx((1.0 {pm} {tol1}, 2.0 {pm} {tol2}))".format(
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pm=plus_minus, tol1=tol1, tol2=tol2
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)
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assert repr(approx(inf)) == "inf"
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assert repr(approx(1.0, rel=nan)) == "1.0 {pm} ???".format(pm=plus_minus)
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assert repr(approx(1.0, rel=inf)) == "1.0 {pm} {infr}".format(
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pm=plus_minus, infr=infr
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)
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assert repr(approx(1.0j, rel=inf)) == "1j"
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# Dictionaries aren't ordered, so we need to check both orders.
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assert repr(approx({"a": 1.0, "b": 2.0})) in (
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"approx({{'a': 1.0 {pm} {tol1}, 'b': 2.0 {pm} {tol2}}})".format(
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pm=plus_minus, tol1=tol1, tol2=tol2
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),
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"approx({{'b': 2.0 {pm} {tol2}, 'a': 1.0 {pm} {tol1}}})".format(
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pm=plus_minus, tol1=tol1, tol2=tol2
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),
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)
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@pytest.mark.parametrize(
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"value, repr_string",
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[
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(5.0, "approx(5.0 {pm} 5.0e-06)"),
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([5.0], "approx([5.0 {pm} 5.0e-06])"),
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([[5.0]], "approx([[5.0 {pm} 5.0e-06]])"),
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([[5.0, 6.0]], "approx([[5.0 {pm} 5.0e-06, 6.0 {pm} 6.0e-06]])"),
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([[5.0], [6.0]], "approx([[5.0 {pm} 5.0e-06], [6.0 {pm} 6.0e-06]])"),
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],
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)
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def test_repr_nd_array(self, plus_minus, value, repr_string):
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"""Make sure that arrays of all different dimensions are repr'd correctly."""
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np = pytest.importorskip("numpy")
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np_array = np.array(value)
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assert repr(approx(np_array)) == repr_string.format(pm=plus_minus)
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def test_operator_overloading(self):
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assert 1 == approx(1, rel=1e-6, abs=1e-12)
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assert not (1 != approx(1, rel=1e-6, abs=1e-12))
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assert 10 != approx(1, rel=1e-6, abs=1e-12)
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assert not (10 == approx(1, rel=1e-6, abs=1e-12))
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def test_exactly_equal(self):
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examples = [
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(2.0, 2.0),
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(0.1e200, 0.1e200),
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(1.123e-300, 1.123e-300),
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(12345, 12345.0),
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(0.0, -0.0),
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(345678, 345678),
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(Decimal("1.0001"), Decimal("1.0001")),
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(Fraction(1, 3), Fraction(-1, -3)),
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]
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for a, x in examples:
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assert a == approx(x)
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def test_opposite_sign(self):
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examples = [(eq, 1e-100, -1e-100), (ne, 1e100, -1e100)]
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for op, a, x in examples:
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assert op(a, approx(x))
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def test_zero_tolerance(self):
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within_1e10 = [(1.1e-100, 1e-100), (-1.1e-100, -1e-100)]
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for a, x in within_1e10:
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assert x == approx(x, rel=0.0, abs=0.0)
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assert a != approx(x, rel=0.0, abs=0.0)
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assert a == approx(x, rel=0.0, abs=5e-101)
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assert a != approx(x, rel=0.0, abs=5e-102)
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assert a == approx(x, rel=5e-1, abs=0.0)
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assert a != approx(x, rel=5e-2, abs=0.0)
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def test_negative_tolerance(self):
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# Negative tolerances are not allowed.
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illegal_kwargs = [
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dict(rel=-1e100),
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dict(abs=-1e100),
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dict(rel=1e100, abs=-1e100),
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dict(rel=-1e100, abs=1e100),
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dict(rel=-1e100, abs=-1e100),
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]
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for kwargs in illegal_kwargs:
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with pytest.raises(ValueError):
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1.1 == approx(1, **kwargs)
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def test_inf_tolerance(self):
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# Everything should be equal if the tolerance is infinite.
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large_diffs = [(1, 1000), (1e-50, 1e50), (-1.0, -1e300), (0.0, 10)]
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for a, x in large_diffs:
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assert a != approx(x, rel=0.0, abs=0.0)
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assert a == approx(x, rel=inf, abs=0.0)
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assert a == approx(x, rel=0.0, abs=inf)
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assert a == approx(x, rel=inf, abs=inf)
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def test_inf_tolerance_expecting_zero(self):
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# If the relative tolerance is zero but the expected value is infinite,
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# the actual tolerance is a NaN, which should be an error.
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illegal_kwargs = [dict(rel=inf, abs=0.0), dict(rel=inf, abs=inf)]
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for kwargs in illegal_kwargs:
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with pytest.raises(ValueError):
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1 == approx(0, **kwargs)
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def test_nan_tolerance(self):
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illegal_kwargs = [dict(rel=nan), dict(abs=nan), dict(rel=nan, abs=nan)]
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for kwargs in illegal_kwargs:
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with pytest.raises(ValueError):
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1.1 == approx(1, **kwargs)
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def test_reasonable_defaults(self):
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# Whatever the defaults are, they should work for numbers close to 1
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# than have a small amount of floating-point error.
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assert 0.1 + 0.2 == approx(0.3)
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def test_default_tolerances(self):
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# This tests the defaults as they are currently set. If you change the
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# defaults, this test will fail but you should feel free to change it.
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# None of the other tests (except the doctests) should be affected by
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# the choice of defaults.
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examples = [
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# Relative tolerance used.
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(eq, 1e100 + 1e94, 1e100),
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(ne, 1e100 + 2e94, 1e100),
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(eq, 1e0 + 1e-6, 1e0),
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(ne, 1e0 + 2e-6, 1e0),
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# Absolute tolerance used.
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(eq, 1e-100, +1e-106),
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(eq, 1e-100, +2e-106),
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(eq, 1e-100, 0),
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]
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for op, a, x in examples:
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assert op(a, approx(x))
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def test_custom_tolerances(self):
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assert 1e8 + 1e0 == approx(1e8, rel=5e-8, abs=5e0)
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assert 1e8 + 1e0 == approx(1e8, rel=5e-9, abs=5e0)
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assert 1e8 + 1e0 == approx(1e8, rel=5e-8, abs=5e-1)
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assert 1e8 + 1e0 != approx(1e8, rel=5e-9, abs=5e-1)
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assert 1e0 + 1e-8 == approx(1e0, rel=5e-8, abs=5e-8)
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assert 1e0 + 1e-8 == approx(1e0, rel=5e-9, abs=5e-8)
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assert 1e0 + 1e-8 == approx(1e0, rel=5e-8, abs=5e-9)
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assert 1e0 + 1e-8 != approx(1e0, rel=5e-9, abs=5e-9)
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assert 1e-8 + 1e-16 == approx(1e-8, rel=5e-8, abs=5e-16)
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assert 1e-8 + 1e-16 == approx(1e-8, rel=5e-9, abs=5e-16)
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assert 1e-8 + 1e-16 == approx(1e-8, rel=5e-8, abs=5e-17)
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assert 1e-8 + 1e-16 != approx(1e-8, rel=5e-9, abs=5e-17)
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def test_relative_tolerance(self):
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within_1e8_rel = [(1e8 + 1e0, 1e8), (1e0 + 1e-8, 1e0), (1e-8 + 1e-16, 1e-8)]
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for a, x in within_1e8_rel:
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assert a == approx(x, rel=5e-8, abs=0.0)
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assert a != approx(x, rel=5e-9, abs=0.0)
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def test_absolute_tolerance(self):
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within_1e8_abs = [(1e8 + 9e-9, 1e8), (1e0 + 9e-9, 1e0), (1e-8 + 9e-9, 1e-8)]
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for a, x in within_1e8_abs:
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assert a == approx(x, rel=0, abs=5e-8)
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assert a != approx(x, rel=0, abs=5e-9)
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def test_expecting_zero(self):
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examples = [
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(ne, 1e-6, 0.0),
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(ne, -1e-6, 0.0),
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(eq, 1e-12, 0.0),
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(eq, -1e-12, 0.0),
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(ne, 2e-12, 0.0),
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(ne, -2e-12, 0.0),
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(ne, inf, 0.0),
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(ne, nan, 0.0),
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]
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for op, a, x in examples:
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assert op(a, approx(x, rel=0.0, abs=1e-12))
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assert op(a, approx(x, rel=1e-6, abs=1e-12))
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def test_expecting_inf(self):
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examples = [
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(eq, inf, inf),
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(eq, -inf, -inf),
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(ne, inf, -inf),
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(ne, 0.0, inf),
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(ne, nan, inf),
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]
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for op, a, x in examples:
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assert op(a, approx(x))
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def test_expecting_nan(self):
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examples = [
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(eq, nan, nan),
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(eq, -nan, -nan),
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(eq, nan, -nan),
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(ne, 0.0, nan),
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(ne, inf, nan),
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]
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for op, a, x in examples:
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# Nothing is equal to NaN by default.
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assert a != approx(x)
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# If ``nan_ok=True``, then NaN is equal to NaN.
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assert op(a, approx(x, nan_ok=True))
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def test_int(self):
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within_1e6 = [(1000001, 1000000), (-1000001, -1000000)]
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for a, x in within_1e6:
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assert a == approx(x, rel=5e-6, abs=0)
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assert a != approx(x, rel=5e-7, abs=0)
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assert approx(x, rel=5e-6, abs=0) == a
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assert approx(x, rel=5e-7, abs=0) != a
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def test_decimal(self):
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within_1e6 = [
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(Decimal("1.000001"), Decimal("1.0")),
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(Decimal("-1.000001"), Decimal("-1.0")),
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]
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for a, x in within_1e6:
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assert a == approx(x)
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assert a == approx(x, rel=Decimal("5e-6"), abs=0)
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assert a != approx(x, rel=Decimal("5e-7"), abs=0)
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assert approx(x, rel=Decimal("5e-6"), abs=0) == a
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assert approx(x, rel=Decimal("5e-7"), abs=0) != a
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def test_fraction(self):
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within_1e6 = [
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(1 + Fraction(1, 1000000), Fraction(1)),
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(-1 - Fraction(-1, 1000000), Fraction(-1)),
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]
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for a, x in within_1e6:
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assert a == approx(x, rel=5e-6, abs=0)
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assert a != approx(x, rel=5e-7, abs=0)
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assert approx(x, rel=5e-6, abs=0) == a
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assert approx(x, rel=5e-7, abs=0) != a
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def test_complex(self):
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within_1e6 = [
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(1.000001 + 1.0j, 1.0 + 1.0j),
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(1.0 + 1.000001j, 1.0 + 1.0j),
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(-1.000001 + 1.0j, -1.0 + 1.0j),
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(1.0 - 1.000001j, 1.0 - 1.0j),
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]
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for a, x in within_1e6:
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assert a == approx(x, rel=5e-6, abs=0)
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assert a != approx(x, rel=5e-7, abs=0)
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assert approx(x, rel=5e-6, abs=0) == a
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assert approx(x, rel=5e-7, abs=0) != a
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def test_list(self):
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actual = [1 + 1e-7, 2 + 1e-8]
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expected = [1, 2]
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# Return false if any element is outside the tolerance.
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assert actual == approx(expected, rel=5e-7, abs=0)
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assert actual != approx(expected, rel=5e-8, abs=0)
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assert approx(expected, rel=5e-7, abs=0) == actual
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assert approx(expected, rel=5e-8, abs=0) != actual
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def test_list_wrong_len(self):
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assert [1, 2] != approx([1])
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assert [1, 2] != approx([1, 2, 3])
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def test_tuple(self):
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actual = (1 + 1e-7, 2 + 1e-8)
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expected = (1, 2)
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# Return false if any element is outside the tolerance.
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assert actual == approx(expected, rel=5e-7, abs=0)
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assert actual != approx(expected, rel=5e-8, abs=0)
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assert approx(expected, rel=5e-7, abs=0) == actual
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assert approx(expected, rel=5e-8, abs=0) != actual
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def test_tuple_wrong_len(self):
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assert (1, 2) != approx((1,))
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assert (1, 2) != approx((1, 2, 3))
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def test_dict(self):
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actual = {"a": 1 + 1e-7, "b": 2 + 1e-8}
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# Dictionaries became ordered in python3.6, so switch up the order here
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# to make sure it doesn't matter.
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expected = {"b": 2, "a": 1}
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# Return false if any element is outside the tolerance.
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assert actual == approx(expected, rel=5e-7, abs=0)
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assert actual != approx(expected, rel=5e-8, abs=0)
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assert approx(expected, rel=5e-7, abs=0) == actual
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assert approx(expected, rel=5e-8, abs=0) != actual
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def test_dict_wrong_len(self):
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assert {"a": 1, "b": 2} != approx({"a": 1})
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assert {"a": 1, "b": 2} != approx({"a": 1, "c": 2})
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assert {"a": 1, "b": 2} != approx({"a": 1, "b": 2, "c": 3})
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def test_numpy_array(self):
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np = pytest.importorskip("numpy")
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actual = np.array([1 + 1e-7, 2 + 1e-8])
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expected = np.array([1, 2])
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# Return false if any element is outside the tolerance.
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assert actual == approx(expected, rel=5e-7, abs=0)
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assert actual != approx(expected, rel=5e-8, abs=0)
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assert approx(expected, rel=5e-7, abs=0) == expected
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assert approx(expected, rel=5e-8, abs=0) != actual
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# Should be able to compare lists with numpy arrays.
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assert list(actual) == approx(expected, rel=5e-7, abs=0)
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assert list(actual) != approx(expected, rel=5e-8, abs=0)
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assert actual == approx(list(expected), rel=5e-7, abs=0)
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assert actual != approx(list(expected), rel=5e-8, abs=0)
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def test_numpy_tolerance_args(self):
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"""
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Check that numpy rel/abs args are handled correctly
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for comparison against an np.array
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Check both sides of the operator, hopefully it doesn't impact things.
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Test all permutations of where the approx and np.array() can show up
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"""
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np = pytest.importorskip("numpy")
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expected = 100.0
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actual = 99.0
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abs_diff = expected - actual
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rel_diff = (expected - actual) / expected
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tests = [
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(eq, abs_diff, 0),
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(eq, 0, rel_diff),
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(ne, 0, rel_diff / 2.0), # rel diff fail
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(ne, abs_diff / 2.0, 0), # abs diff fail
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]
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for op, _abs, _rel in tests:
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assert op(np.array(actual), approx(expected, abs=_abs, rel=_rel)) # a, b
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assert op(approx(expected, abs=_abs, rel=_rel), np.array(actual)) # b, a
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assert op(actual, approx(np.array(expected), abs=_abs, rel=_rel)) # a, b
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assert op(approx(np.array(expected), abs=_abs, rel=_rel), actual) # b, a
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assert op(np.array(actual), approx(np.array(expected), abs=_abs, rel=_rel))
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assert op(approx(np.array(expected), abs=_abs, rel=_rel), np.array(actual))
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def test_numpy_expecting_nan(self):
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np = pytest.importorskip("numpy")
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examples = [
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(eq, nan, nan),
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(eq, -nan, -nan),
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(eq, nan, -nan),
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(ne, 0.0, nan),
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(ne, inf, nan),
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]
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for op, a, x in examples:
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# Nothing is equal to NaN by default.
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assert np.array(a) != approx(x)
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assert a != approx(np.array(x))
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# If ``nan_ok=True``, then NaN is equal to NaN.
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assert op(np.array(a), approx(x, nan_ok=True))
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assert op(a, approx(np.array(x), nan_ok=True))
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def test_numpy_expecting_inf(self):
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np = pytest.importorskip("numpy")
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examples = [
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(eq, inf, inf),
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(eq, -inf, -inf),
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(ne, inf, -inf),
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(ne, 0.0, inf),
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(ne, nan, inf),
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]
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for op, a, x in examples:
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assert op(np.array(a), approx(x))
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assert op(a, approx(np.array(x)))
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assert op(np.array(a), approx(np.array(x)))
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def test_numpy_array_wrong_shape(self):
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np = pytest.importorskip("numpy")
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a12 = np.array([[1, 2]])
|
|
a21 = np.array([[1], [2]])
|
|
|
|
assert a12 != approx(a21)
|
|
assert a21 != approx(a12)
|
|
|
|
def test_doctests(self):
|
|
parser = doctest.DocTestParser()
|
|
test = parser.get_doctest(
|
|
approx.__doc__, {"approx": approx}, approx.__name__, None, None
|
|
)
|
|
runner = MyDocTestRunner()
|
|
runner.run(test)
|
|
|
|
def test_unicode_plus_minus(self, testdir):
|
|
"""
|
|
Comparing approx instances inside lists should not produce an error in the detailed diff.
|
|
Integration test for issue #2111.
|
|
"""
|
|
testdir.makepyfile(
|
|
"""
|
|
import pytest
|
|
def test_foo():
|
|
assert [3] == [pytest.approx(4)]
|
|
"""
|
|
)
|
|
expected = "4.0e-06"
|
|
result = testdir.runpytest()
|
|
result.stdout.fnmatch_lines(
|
|
["*At index 0 diff: 3 != 4 * {}".format(expected), "=* 1 failed in *="]
|
|
)
|
|
|
|
@pytest.mark.parametrize(
|
|
"x",
|
|
[
|
|
pytest.param(None),
|
|
pytest.param("string"),
|
|
pytest.param(["string"], id="nested-str"),
|
|
pytest.param([[1]], id="nested-list"),
|
|
pytest.param({"key": "string"}, id="dict-with-string"),
|
|
pytest.param({"key": {"key": 1}}, id="nested-dict"),
|
|
],
|
|
)
|
|
def test_expected_value_type_error(self, x):
|
|
with pytest.raises(TypeError):
|
|
approx(x)
|
|
|
|
@pytest.mark.parametrize(
|
|
"op",
|
|
[
|
|
pytest.param(operator.le, id="<="),
|
|
pytest.param(operator.lt, id="<"),
|
|
pytest.param(operator.ge, id=">="),
|
|
pytest.param(operator.gt, id=">"),
|
|
],
|
|
)
|
|
def test_comparison_operator_type_error(self, op):
|
|
"""
|
|
pytest.approx should raise TypeError for operators other than == and != (#2003).
|
|
"""
|
|
with pytest.raises(TypeError):
|
|
op(1, approx(1, rel=1e-6, abs=1e-12))
|
|
|
|
def test_numpy_array_with_scalar(self):
|
|
np = pytest.importorskip("numpy")
|
|
|
|
actual = np.array([1 + 1e-7, 1 - 1e-8])
|
|
expected = 1.0
|
|
|
|
assert actual == approx(expected, rel=5e-7, abs=0)
|
|
assert actual != approx(expected, rel=5e-8, abs=0)
|
|
assert approx(expected, rel=5e-7, abs=0) == actual
|
|
assert approx(expected, rel=5e-8, abs=0) != actual
|
|
|
|
def test_numpy_scalar_with_array(self):
|
|
np = pytest.importorskip("numpy")
|
|
|
|
actual = 1.0
|
|
expected = np.array([1 + 1e-7, 1 - 1e-8])
|
|
|
|
assert actual == approx(expected, rel=5e-7, abs=0)
|
|
assert actual != approx(expected, rel=5e-8, abs=0)
|
|
assert approx(expected, rel=5e-7, abs=0) == actual
|
|
assert approx(expected, rel=5e-8, abs=0) != actual
|
|
|
|
def test_generic_sized_iterable_object(self):
|
|
class MySizedIterable:
|
|
def __iter__(self):
|
|
return iter([1, 2, 3, 4])
|
|
|
|
def __len__(self):
|
|
return 4
|
|
|
|
expected = MySizedIterable()
|
|
assert [1, 2, 3, 4] == approx(expected)
|