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import pytest
from parsl.app.app import python_app
from parsl.dataflow.errors import DependencyError
class ManufacturedTestFailure(Exception):
pass
@python_app
def random_fail(fail_prob: float, inputs=()):
import random
if random.random() < fail_prob:
raise ManufacturedTestFailure("App failure")
def test_no_deps():
"""Test basic error handling, with no dependent failures
"""
futs = [random_fail(1), random_fail(0), random_fail(0)]
for f in futs:
try:
f.result()
except ManufacturedTestFailure:
pass
@pytest.mark.parametrize("fail_probs", ((1, 0), (0, 1)))
def test_fail_sequence(fail_probs):
"""Test failure in a sequence of dependencies
App1 -> App2 ... -> AppN
"""
t1_fail_prob, t2_fail_prob = fail_probs
t1 = random_fail(fail_prob=t1_fail_prob)
t2 = random_fail(fail_prob=t2_fail_prob, inputs=[t1])
t_final = random_fail(fail_prob=0, inputs=[t2])
with pytest.raises(DependencyError):
t_final.result()
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