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def test_thread_comp_fixture(pytester):
"""Test that ThreadComparator works as expected."""
# create a temporary pytest test module
pytester.makepyfile("""
import threading
import pytest
class Counter:
def __init__(self):
self._value = 0
self._lock = threading.Lock()
def get_value_and_increment(self):
with self._lock:
value = int(self._value)
self._value += 1
return value
def test_value_comparison(num_parallel_threads, thread_comp):
assert num_parallel_threads == 10
a = 1
b = [2, 'string', 1.0]
c = {'a': -4, 'b': 'str'}
d = float('nan')
e = float('inf')
f = {'a', 'b', '#'}
thread_comp(a=a, b=b, c=c, d=d, e=e, f=f)
# Ensure that the comparator can be used again
thread_comp(g=4)
@pytest.fixture
def counter(num_parallel_threads):
return Counter()
def test_comparison_fail(thread_comp, counter):
a = 4
pos = counter.get_value_and_increment()
if pos % 2 == 0:
a = -1
thread_comp(a=a)
""")
# run pytest with the following cmd args
result = pytester.runpytest("--parallel-threads=10", "-v")
# fnmatch_lines does an assertion internally
result.stdout.fnmatch_lines(
[
"*::test_value_comparison PARALLEL PASSED*",
"*::test_comparison_fail PARALLEL FAILED*",
]
)
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