gh-102209: Sync with zipp 3.15 moving complexity tests into dedicated…

… module (#102232)

Sync with jaraco/zipp@757a4e1a.

Lib/test/test_zipfile/_itertools.py

@@ -1,4 +1,6 @@
 import itertools
+from collections import deque
+from itertools import islice
 
 
 # from jaraco.itertools 6.3.0
@@ -39,3 +41,39 @@ def always_iterable(obj, base_type=(str, bytes)):
         return iter(obj)
     except TypeError:
         return iter((obj,))
+
+
+# from more_itertools v9.0.0
+def consume(iterator, n=None):
+    """Advance *iterable* by *n* steps. If *n* is ``None``, consume it
+    entirely.
+    Efficiently exhausts an iterator without returning values. Defaults to
+    consuming the whole iterator, but an optional second argument may be
+    provided to limit consumption.
+        >>> i = (x for x in range(10))
+        >>> next(i)
+        0
+        >>> consume(i, 3)
+        >>> next(i)
+        4
+        >>> consume(i)
+        >>> next(i)
+        Traceback (most recent call last):
+          File "<stdin>", line 1, in <module>
+        StopIteration
+    If the iterator has fewer items remaining than the provided limit, the
+    whole iterator will be consumed.
+        >>> i = (x for x in range(3))
+        >>> consume(i, 5)
+        >>> next(i)
+        Traceback (most recent call last):
+          File "<stdin>", line 1, in <module>
+        StopIteration
+    """
+    # Use functions that consume iterators at C speed.
+    if n is None:
+        # feed the entire iterator into a zero-length deque
+        deque(iterator, maxlen=0)
+    else:
+        # advance to the empty slice starting at position n
+        next(islice(iterator, n, n), None)

Lib/test/test_zipfile/_support.py

@@ -0,0 +1,9 @@
+import importlib
+import unittest
+
+
+def import_or_skip(name):
+    try:
+        return importlib.import_module(name)
+    except ImportError:  # pragma: no cover
+        raise unittest.SkipTest(f'Unable to import {name}')

Lib/test/test_zipfile/test_complexity.py

@@ -0,0 +1,24 @@
+import unittest
+import string
+import zipfile
+
+from ._functools import compose
+from ._itertools import consume
+
+from ._support import import_or_skip
+
+
+big_o = import_or_skip('big_o')
+
+
+class TestComplexity(unittest.TestCase):
+    def test_implied_dirs_performance(self):
+        best, others = big_o.big_o(
+            compose(consume, zipfile.CompleteDirs._implied_dirs),
+            lambda size: [
+                '/'.join(string.ascii_lowercase + str(n)) for n in range(size)
+            ],
+            max_n=1000,
+            min_n=1,
+        )
+        assert best <= big_o.complexities.Linear

Lib/test/test_zipfile/test_path.py

@@ -3,7 +3,6 @@
 import contextlib
 import pathlib
 import pickle
-import string
 import sys
 import unittest
 import zipfile
@@ -12,7 +11,6 @@
 from ._itertools import Counter
 
 from ._test_params import parameterize, Invoked
-from ._func_timeout_compat import set_timeout
 
 from test.support.os_helper import temp_dir
 
@@ -22,9 +20,6 @@ class itertools:
         Counter = Counter
 
 
-consume = tuple
-
-
 def add_dirs(zf):
     """
     Given a writable zip file zf, inject directory entries for
@@ -330,12 +325,6 @@ def test_joinpath_constant_time(self):
         # Check the file iterated all items
         assert entries.count == self.HUGE_ZIPFILE_NUM_ENTRIES
 
-    # timeout disabled due to #102209
-    # @set_timeout(3)
-    def test_implied_dirs_performance(self):
-        data = ['/'.join(string.ascii_lowercase + str(n)) for n in range(10000)]
-        zipfile.CompleteDirs._implied_dirs(data)
-
     @pass_alpharep
     def test_read_does_not_close(self, alpharep):
         alpharep = self.zipfile_ondisk(alpharep)
@@ -513,7 +502,7 @@ def test_pickle(self, alpharep, path_type, subpath):
         saved_1 = pickle.dumps(zipfile.Path(zipfile_ondisk, at=subpath))
         restored_1 = pickle.loads(saved_1)
         first, *rest = restored_1.iterdir()
-        assert first.read_text().startswith('content of ')
+        assert first.read_text(encoding='utf-8').startswith('content of ')
 
     @pass_alpharep
     def test_extract_orig_with_implied_dirs(self, alpharep):
@@ -525,3 +514,12 @@ def test_extract_orig_with_implied_dirs(self, alpharep):
         # wrap the zipfile for its side effect
         zipfile.Path(zf)
         zf.extractall(source_path.parent)
+
+    @pass_alpharep
+    def test_getinfo_missing(self, alpharep):
+        """
+        Validate behavior of getinfo on original zipfile after wrapping.
+        """
+        zipfile.Path(alpharep)
+        with self.assertRaises(KeyError):
+            alpharep.getinfo('does-not-exist')

Lib/zipfile/_path.py

@@ -86,6 +86,11 @@ class CompleteDirs(InitializedState, zipfile.ZipFile):
     """
     A ZipFile subclass that ensures that implied directories
     are always included in the namelist.
+
+    >>> list(CompleteDirs._implied_dirs(['foo/bar.txt', 'foo/bar/baz.txt']))
+    ['foo/', 'foo/bar/']
+    >>> list(CompleteDirs._implied_dirs(['foo/bar.txt', 'foo/bar/baz.txt', 'foo/bar/']))
+    ['foo/']
     """
 
     @staticmethod
@@ -215,7 +220,7 @@ class Path:
 
     Read text:
 
-    >>> c.read_text()
+    >>> c.read_text(encoding='utf-8')
     'content of c'
 
     existence: