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-rw-r--r--Lib/test/string_tests.py14
1 files changed, 11 insertions, 3 deletions
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index d69edd7..fdced1c 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -327,11 +327,12 @@ class BaseTest:
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)))
@@ -341,6 +342,13 @@ class BaseTest:
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