Move complexity tests to their own module.

tests/_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}')

tests/test_complexity.py

@@ -0,0 +1,24 @@
+import unittest
+import string
+
+import zipp
+from jaraco.functools import compose
+from more_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, zipp.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

tests/test_zipp.py

@@ -5,15 +5,12 @@
 import tempfile
 import shutil
 import pickle
-import string
 import sys
 import unittest
 import zipfile
 
-import big_o
 import jaraco.itertools
 from jaraco.functools import compose
-from more_itertools import consume
 
 import zipp
 
@@ -334,17 +331,6 @@ def test_joinpath_constant_time(self):
         # Check the file iterated all items
         assert entries.count == self.HUGE_ZIPFILE_NUM_ENTRIES
 
-    def test_implied_dirs_performance(self):
-        best, others = big_o.big_o(
-            compose(consume, zipp.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
-
     @pass_alpharep
     def test_read_does_not_close(self, alpharep):
         alpharep = self.zipfile_ondisk(alpharep)