def test_p_continue(average_size, max_size):
assume(average_size <= max_size)
p = cu._calc_p_continue(average_size, max_size)
assert 0 <= target(p, label="p") <= 1
assert 0 < target(p, label="-p") or average_size < 1e-5
abs_err = abs(average_size - cu._p_continue_to_avg(p, max_size))
assert target(abs_err, label="abs_err") < 0.01
def test_abs_jd2_always_less_than_half_on_construction(jds):
jd1, jd2 = jds
t = Time(jd1, jd2, format="jd")
target(np.amax(np.abs(t.jd2)))
assert np.all(t.jd1 % 1 == 0)
assert np.all(abs(t.jd2) <= 0.5)
assert np.all((abs(t.jd2) < 0.5) | (t.jd1 % 2 == 0))
def test_all_segment_intersections_transform(segments, transform):
"""Verify that the intersections between a bunch of segments remain the same
under transforms and adding extra segments does not remove points"""
distractors = []
def transform_segment(segment):
return (affine_transform(transform, segment[0]),
affine_transform(transform, segment[1]))
tr_segments = set([transform_segment(segment) for segment in segments])
distracted_tr_segments = list(tr_segments | set(distractors))
intersections = asi(segments)
distracted_tr_intersections = asi(distracted_tr_segments)
hyp.target(float(sum([len(segs)
for pt, segs in distracted_tr_intersections])))
manually_tr_intersections = _normalize_result([
(affine_transform(transform, pt),
[transform_segment(segment) for segment in inter_segments])
for pt, inter_segments in intersections])
# Filter tr_intersections
# Fix to use walrus in python 3.8...
tr_intersections = _normalize_result([
(pt, tr_segments & set(inter_segments))
for pt, inter_segments in distracted_tr_intersections
if len(tr_segments & set(inter_segments)) >= 2])
# return locals()
assert tr_intersections == manually_tr_intersections
def test_paths_with_target(path):
"""Generate paths targeting lower right.
"""
x, y = path_endpoint(path)
print("With target: x={}, y={}, len={}".format(x, y, len(path)))
in_range = to_range(x - y, 100)
event(str(in_range))
target_function = float(x - y)
target(target_function)
def assert_almost_equal(a, b, *, rtol=None, atol=None, label=''):
"""Assert numbers are almost equal.
This version also lets hypothesis know how far apart the inputs are, so
that it can work towards a failure and present the worst failure ever seen
as well as the simplest, which often just barely exceeds the threshold.
"""
__tracebackhide__ = True
if rtol is None or rtol == 0:
thresh = atol
elif atol is None:
thresh = rtol * (abs(a) + abs(b)) / 2
else:
thresh = atol + rtol * (abs(a) + abs(b)) / 2
amb = (a - b)
if isinstance(amb, TimeDelta):
ambv = amb.to_value(u.s)
target(ambv, label=label + " (a-b).to_value(u.s), from TimeDelta")
target(-ambv, label=label + " (b-a).to_value(u.s), from TimeDelta")
if isinstance(thresh, u.Quantity):
amb = amb.to(thresh.unit)
else:
try:
target_value = float(amb)
except TypeError:
pass
else:
target(target_value, label=label + " float(a-b)")
target(-target_value, label=label + " float(b-a)")
assert abs(amb) < thresh
def _record_targets(code: str, prefix: str = "") -> str:
# target larger inputs - the Hypothesis engine will do a multi-objective
# hill-climbing search using these scores to generate 'better' examples.
nodes = list(ast.walk(ast.parse(code)))
import_nodes = [
n for n in nodes if isinstance(n, (ast.Import, ast.ImportFrom))
]
uniq_nodes = {type(n) for n in nodes}
for value, label in [
(len(import_nodes), "total number of import nodes"),
(len(uniq_nodes), "number of unique ast node types"),
]:
hypothesis.target(float(value), label=prefix + label)
return code
def test_targeting_square_loss(d):
"""Contrived example of targeting properties.
"""
# Assume this value triggers a bug
target_value = 42
should_fail = abs(d - target_value) < 0.5
if should_fail:
print("Failing with value {}".format(d))
raise Exception("Critically close to {}, got {}".format(target_value, d))
# Target the value
loss = math.pow((d - target_value), 2.0)
target(-loss)
def record_targets(code: str) -> str:
# target larger inputs - the Hypothesis engine will do a multi-objective
# hill-climbing search using these scores to generate 'better' examples.
nodes = list(ast.walk(ast.parse(code)))
uniq_nodes = {type(n) for n in nodes}
instructions = list(dis.Bytecode(compile(code, "<string>", "exec")))
for value, label in [
(len(instructions),
"(hypothesmith from_node) instructions in bytecode"),
(len(nodes), "(hypothesmith from_node) total number of ast nodes"),
(len(uniq_nodes),
"(hypothesmith from_node) number of unique ast node types"),
]:
target(float(value), label=label)
return code
def assertColorsValid(self, **colors):
assert len(colors) == 3 # sanity-check
# Our color assertion helper checks that each color is in the range
# [0, 1], and that it approximately round-tripped. We also "target"
# the difference, to maximise and report the largest error each run.
for name, values in colors.items():
for v in values:
self.assertGreaterEqual(v,
0 if name not in "iq" else -1,
msg=f"color={name!r}")
self.assertLessEqual(v, 1, msg=f"color={name!r}")
target(
abs(values[0] - values[1]),
label=f"absolute difference in {name.upper()} values",
)
self.assertAlmostEqual(*values, msg=f"color={name!r}")
def test_compare_geth_hevm(b):
code = b.hex()
note("code that caused failure: ")
note(code)
# prepopulate the stack a bit
x = os.system(
'evm --code ' + code +
' --gas 0xfffffffff --json --receiver 0xacab --nomemory run > gethout'
)
y = os.system(
'hevm exec --code ' + code +
' --gas 0xfffffffff --chainid 0x539 --gaslimit 0xfffffffff --jsontrace --origin 0x73656e646572 --caller 0x73656e646572 > hevmout'
)
assert x == y
gethlines = open('gethout').read().split('\n')
hevmlines = open('hevmout').read().split('\n')
target(float(len(gethlines)))
for i in range(len(hevmlines) - 3):
gethline = gethlines[i]
hevmline = hevmlines[i]
hjson = json.loads(hevmline)
gjson = json.loads(gethline)
## printed when diverging
note('')
note('--- STEP ----')
note('geth thinks that')
note(gethline)
note('while hevm believes')
note(hevmline)
note('')
assert hjson['pc'] == gjson['pc']
assert hjson['stack'] == gjson['stack']
# we can't compare memsize for now because geth
# measures memory and memsize after the instruction,
# as opposed to all other fields...
# assert hjson['memSize'] == gjson['memSize']
assert hjson['gas'] == gjson['gas']
gethres = json.loads(gethlines[len(gethlines) - 2])
hevmres = json.loads(hevmlines[len(hevmlines) - 2])
note('--- OUTPUT ----')
note('geth thinks that')
note(gethres)
note('while hevm believes')
note(hevmres)
assert gethres['output'] == hevmres['output']
assert gethres['gasUsed'] == hevmres['gasUsed']
def test_toeplitz_only_col(toep_cls, first_col, test):
"""Test toeplitz for real inputs."""
full_mat = toeplitz(first_col)
toeplitz_op = toep_cls(first_col)
if first_col.dtype == np.float16:
atol_frac = 1e-2
elif first_col.dtype == np.float32:
atol_frac = 1e-5
elif first_col.dtype == np.float64:
atol_frac = 1e-14
elif first_col.dtype == np.float128:
atol_frac = 1.1e-14
max_el = np.max(np.abs(first_col))
if max_el != 0:
max_el *= np.max(np.abs(test))
mat_result = full_mat.dot(test)
target(float(np.sum(np.isfinite(mat_result))), label="mat_result_finite")
if first_col.dtype == np.float32:
# Apparently `np.dot` uses an extended-precision accumulator
assume(np.all(np.isfinite(mat_result)))
op_result = toeplitz_op.dot(test)
target(float(np.sum(np.isfinite(op_result))), label="op_result_finite")
target(
float(np.sum(np.isfinite(np.abs(op_result)))),
label="op_result_mag_finite"
)
if toep_cls == FFTToeplitz:
assume(np.all(np.isfinite(op_result)))
assume(np.all(np.isfinite(np.abs(op_result))))
atol = atol_frac * max_el + ATOL_MIN * (len(test) + toeplitz_op.shape[0])
assume(atol < np.inf)
np_tst.assert_allclose(
op_result,
mat_result,
atol=atol,
rtol=atol_frac
)
def threshold(error):
target(error, label="error")
assert error <= 10
target(0.0, label="never in failing example")
def test(value):
event(value)
target(float(value), label="a target")
def test_cannot_target_same_label_twice(_):
target(0.0, label="label")
with pytest.raises(InvalidArgument):
target(1.0, label="label")
def test_cannot_target_outside_test():
with pytest.raises(InvalidArgument):
target(1.0, label="example label")
def run_targets(targets: Iterable[Callable], context: TargetContext) -> None:
for target in targets:
value = target(context)
hypothesis.target(value, label=target.__name__)
def test(ls):
score = float(sum(ls))
result[0] = max(result[0], score)
target(score)
def test_with_targeting(ls):
target(float(len(ls)))
assert len(ls) <= 80
def test_allowed_inputs_to_target_fewer_labels(observation, label):
target(observation, label=label)
def test_targeting_with_many_empty(_):
# This exercises some logic in the optimiser that prevents it from trying
# to mutate empty examples in the middle of the test case.
target(1.0)
def test_targeting_with_following_empty(ls, n):
# This exercises some logic in the optimiser that prevents it from trying
# to mutate empty examples at the end of the test case.
target(float(len(ls)))
def test_cannot_target_default_label_twice(_):
target(0.0)
with pytest.raises(InvalidArgument):
target(1.0)
def test_target_without_label(observation):
target(observation)
def test_allowed_inputs_to_target(observation, label):
target(observation, label)
def test_target_returns_value(a, b):
difference = target(abs(a - b))
assert difference == abs(a - b)
assert isinstance(difference, int)
def test_multiple_target_calls(args):
for observation, label in args:
target(observation, label=label)
def test_targeting_square_loss(d):
target(-((d - 42.5)**2.0))
def test_respects_max_pool_size(observations):
"""Using many examples of several labels like this stresses the
pool-size logic and internal assertions in TargetSelector.
"""
for i, obs in enumerate(observations):
target(obs, label=str(i))
def run_targets(targets: Iterable[Target], elapsed: float) -> None:
for target in targets:
if target == Target.response_time:
hypothesis.target(elapsed, label="response_time")
def test_disallowed_inputs_to_target(observation, label):
with pytest.raises(InvalidArgument):
target(observation, label=label)