Add test_lazy_import for enum, functools, and email.utils

python · JelleZijlstra · May 5, 2025 · Apr 27, 2025 · Apr 28, 2025 · May 4, 2025
commit 97e8d478f9bf1b686a4e56283f9af194ae2f766b
@@ -4,6 +4,16 @@
 import time
 import unittest
 
+from test.support import cpython_only
+from test.support.import_helper import ensure_lazy_imports
+
+
+class TestImportTime(unittest.TestCase):
+
+    @cpython_only
+    def test_lazy_import(self):
+        ensure_lazy_imports("email.utils", {"random", "socket"})
+
 
 class DateTimeTests(unittest.TestCase):
 

@@ -19,7 +19,8 @@
 from pickle import dumps, loads, PicklingError, HIGHEST_PROTOCOL
 from test import support
 from test.support import ALWAYS_EQ, REPO_ROOT
-from test.support import threading_helper
+from test.support import threading_helper, cpython_only
+from test.support.import_helper import ensure_lazy_imports
 from datetime import timedelta
 
 python_version = sys.version_info[:2]
@@ -1274,6 +1275,10 @@ class Holiday(date, Enum):
             IDES_OF_MARCH = 2013, 3, 15
         self.Holiday = Holiday
 
+    @cpython_only
+    def test_lazy_import(self):
+        ensure_lazy_imports("enum", {"functools", "warnings", "inspect", "re"})
+
     def test_bool(self):
         # plain Enum members are always True
         class Logic(Enum):

@@ -23,6 +23,7 @@
 
 from test.support import import_helper
 from test.support import threading_helper
+from test.support import cpython_only
 from test.support import EqualToForwardRef
 
 import functools
@@ -63,6 +64,14 @@ def __add__(self, other):
 class MyDict(dict):
     pass
 
+class TestImportTime(unittest.TestCase):
+
+    @cpython_only
+    def test_lazy_import(self):
+        import_helper.ensure_lazy_imports(
+            "functools", {"os", "weakref", "typing", "annotationlib", "warnings"}
+        )
+
 
 class TestPartial:
 

@@ -16,6 +16,7 @@
 from urllib.request import pathname2url
 
 from test.support import import_helper
+from test.support import cpython_only
 from test.support import is_emscripten, is_wasi
 from test.support import infinite_recursion
 from test.support import os_helper
@@ -129,6 +130,7 @@ class StrSubclass(str):
         for part in p.parts:
             self.assertIs(type(part), str)
 
+    @cpython_only
     def test_lazy_import(self):
         import_helper.ensure_lazy_imports("pathlib", {"shutil"})
 

diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
@@ -120,6 +120,7 @@ def tearDown(self):
 class ThreadTests(BaseTestCase):
     maxDiff = 9999
 
+    @cpython_only
     def test_lazy_import(self):
         ensure_lazy_imports("threading", {"functools", "warnings"})