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# Copyright (C) 2014-2018 Olzhas Rakhimov
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Tests for the fault tree generator."""
from __future__ import division, absolute_import
import random
from subprocess import call
from tempfile import NamedTemporaryFile
from unittest import TestCase
from lxml import etree
import pytest
from fault_tree_generator import FactorError, Factors, generate_fault_tree, \
write_info, write_summary, main
# pylint: disable=redefined-outer-name
@pytest.fixture()
def factors():
"""Creates partially constructed factors collection."""
return Factors()
def test_min_max_prob_valid(factors):
"""Tests setting of valid probability min-max factors."""
factors.set_min_max_prob(0.1, 0.5)
assert factors.min_prob == 0.1
assert factors.max_prob == 0.5
@pytest.mark.parametrize("min_value,max_value",
[(-0.1, 0.5), (1.1, 0.5), (0.1, -0.5), (0.1, 1.5),
(0.5, 0.1)])
def test_min_max_prob_fail(factors, min_value, max_value):
"""Tests setting of invalid probability min-max factors."""
with pytest.raises(FactorError):
factors.set_min_max_prob(min_value, max_value)
def test_set_common_event_valid(factors):
"""Tests valid common event factors."""
factors.set_common_event_factors(0.4, 0.2, 3, 4)
assert factors.common_b == 0.4
assert factors.common_g == 0.2
assert factors.parents_b == 3
assert factors.parents_g == 4
@pytest.mark.parametrize(
"args", [(-0.1, 0.5, 2, 2), (1.0, 0.5, 2, 2), (0.1, -0.5, 2, 2),
(0.1, 1.0, 2, 2), (0, 0, 2, 2), (0.1, 0.1, 1, 2),
(0.1, 0.1, 101, 2), (0.1, 0.1, 2, 1), (0.1, 0.1, 2, 101)])
def test_set_common_event_fail(factors, args):
"""Tests setting of invalid common event factors."""
factors.set_common_event_factors(0.1, 0.1, 2, 2) # no fail
with pytest.raises(FactorError):
factors.set_common_event_factors(*args)
def test_set_num_factors_valid(factors):
"""Tests setting of valid size factors."""
factors.set_num_factors(3, 100, 5, 4)
assert factors.num_args == 3
assert factors.num_basic == 100
assert factors.num_house == 5
assert factors.num_ccf == 4
@pytest.mark.parametrize(
"args",
[
(1.5, 100),
(3, 0),
(3, 100, -5),
(3, 100, 0, -4),
# Too many house events.
(3, 5, 5),
# Too many CCF groups.
(5, 50, 0, 11)
])
def test_set_num_factors_fail(factors, args):
"""Tests setting of invalid size factors."""
with pytest.raises(FactorError):
factors.set_num_factors(*args)
@pytest.mark.parametrize(
"args,expected",
[
([5, 8, 4, 2, 1], [5, 8, 4, 2, 1]),
([5, 8, 4], [5, 8, 4, 0, 0]) # for padding with 0s
])
def test_set_gate_weights_valid(factors, args, expected):
"""Tests the setting of valid gate weights."""
factors.set_gate_weights(args)
assert factors.get_gate_weights() == expected
@pytest.mark.parametrize(
"args",
[
[],
[-1, 2, 3],
[0, 0, 0],
# Too many weights.
[1, 2, 3, 4, 5, 6],
# XOR or NOT only.
[0, 0, 0, 1, 2],
])
def test_set_gate_weights_fail(factors, args):
"""Tests the setting of invalid gate weights."""
with pytest.raises(FactorError):
factors.set_gate_weights(args)
def test_constrain_num_gates(factors):
"""Checks invalid setup for constraining gate numbers."""
with pytest.raises(FactorError):
factors.constrain_num_gate(0)
factors.num_args = 4
factors.num_basic = 400
with pytest.raises(FactorError):
factors.constrain_num_gate(50) # unsatisfiable
class FaultTreeGeneratorTestCase(TestCase):
"""General tests for the fault tree generator script."""
def setUp(self):
"""Initializes the generator factors for default complexity."""
self.output = NamedTemporaryFile(mode="w+")
random.seed(123)
self.factors = Factors()
self.factors.set_min_max_prob(0.01, 0.1)
self.factors.set_common_event_factors(0.1, 0.1, 2, 2)
self.factors.set_num_factors(3, 10000)
self.factors.set_gate_weights([1, 1, 0, 0, 0])
self.factors.calculate()
def test_xml_output(self):
"""Checks if the XML output passes the schema validation."""
self.factors.set_gate_weights([1, 1, 1, 0.1, 0.1])
self.factors.num_house = 10
self.factors.num_ccf = 10
self.factors.calculate()
fault_tree = generate_fault_tree("TestingTree", "root", self.factors)
assert fault_tree is not None
write_info(fault_tree, self.output, 123)
write_summary(fault_tree, self.output)
self.output.write(fault_tree.to_xml(1))
self.output.flush()
relaxng_doc = etree.parse("../share/input.rng")
relaxng = etree.RelaxNG(relaxng_doc)
with open(self.output.name, "r") as test_file:
doc = etree.parse(test_file)
assert relaxng.validate(doc)
def test_aralia_output(self):
"""Checks if the Aralia format output passes validation."""
self.factors.set_gate_weights([1, 1, 1, 0.1, 0.1])
self.factors.num_house = 10
self.factors.num_ccf = 10
self.factors.calculate()
fault_tree = generate_fault_tree("TestingTree", "root", self.factors)
assert fault_tree is not None
self.output.write(fault_tree.to_aralia())
self.output.file.flush()
tmp = NamedTemporaryFile(mode="w+")
cmd = ["./translators/aralia.py", self.output.name, "-o", tmp.name]
assert call(cmd) == 0
def test_constrain_num_gates(self):
"""Checks the case of the constrained number of gates."""
self.factors.set_gate_weights([1, 1, 1, 0.1, 0.1])
self.factors.num_basic = 200
self.factors.constrain_num_gate(200)
self.factors.calculate()
fault_tree = generate_fault_tree("TestingTree", "root", self.factors)
assert fault_tree is not None
assert abs(1 - len(fault_tree.gates) / 200) < 0.1
def test_main():
"""Tests the main() of the generator."""
tmp = NamedTemporaryFile(mode="w+")
main(["-b", "200", "-g", "200", "-o", tmp.name])
relaxng_doc = etree.parse("../share/input.rng")
relaxng = etree.RelaxNG(relaxng_doc)
with open(tmp.name, "r") as test_file:
doc = etree.parse(test_file)
assert relaxng.validate(doc)
main(["-b", "200", "-g", "200", "-o", tmp.name, "--aralia"])
cmd = [
"./translators/aralia.py", tmp.name, "-o",
NamedTemporaryFile(mode="w+").name
]
assert call(cmd) == 0
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