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[3.11] gh-110160: Fix flaky test_find_periodic_pattern in string_tests (… #110183

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Merged
merged 1 commit into from
Oct 1, 2023
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[3.11] gh-110160: Fix flaky test_find_periodic_pattern in string_tests (… #110183

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14 changes: 11 additions & 3 deletions Lib/test/string_tests.py
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Original file line number Diff line number Diff line change
Expand Up @@ -327,11 +327,12 @@ def reference_find(p, s):
for i in range(len(s)):
if s.startswith(p, i):
return i
if p == '' and s == '':
return 0
return -1

rr = random.randrange
choices = random.choices
for _ in range(1000):
def check_pattern(rr):
choices = random.choices
p0 = ''.join(choices('abcde', k=rr(10))) * rr(10, 20)
p = p0[:len(p0) - rr(10)] # pop off some characters
left = ''.join(choices('abcdef', k=rr(2000)))
Expand All @@ -341,6 +342,13 @@ def reference_find(p, s):
self.checkequal(reference_find(p, text),
text, 'find', p)

rr = random.randrange
for _ in range(1000):
check_pattern(rr)

# Test that empty string always work:
check_pattern(lambda *args: 0)

def test_find_shift_table_overflow(self):
"""When the table of 8-bit shifts overflows."""
N = 2**8 + 100
Expand Down