@@ -5,6 +5,7 @@
 import os
 import shutil
 import sys
+import textwrap
 import unittest
 import warnings
 
@@ -309,3 +310,22 @@ def ready_to_import(name=None, source=""):
                 sys.modules[name] = old_module
             else:
                 sys.modules.pop(name, None)
+
+
+def ensure_lazy_imports(imported_module, modules_to_block):
+    """Test that when imported_module is imported, none of the modules in
+    modules_to_block are imported as a side effect."""
+    script = textwrap.dedent(
+        f"""
+        import sys
+        modules_to_block = {modules_to_block}
+        for mod in modules_to_block:
+            assert mod not in sys.modules, f"{{mod}} was imported at startup"
+
+        import {imported_module}
+        for mod in modules_to_block:
+            assert mod not in sys.modules, f"{{mod}} was imported after importing {imported_module}"
+        """
+    )
+    from .script_helper import assert_python_ok
+    assert_python_ok("-S", "-c", script)
@@ -24,6 +24,7 @@
 )
 
 from test import support
+from test.support import import_helper
 from test.test_inspect import inspect_stock_annotations
 from test.test_inspect import inspect_stringized_annotations
 from test.test_inspect import inspect_stringized_annotations_2
@@ -1367,3 +1368,9 @@ def test_multiple_ways_to_create(self):
 class TestAnnotationLib(unittest.TestCase):
     def test__all__(self):
         support.check__all__(self, annotationlib)
+
+    def test_lazy_imports(self):
+        import_helper.ensure_lazy_imports("annotationlib", [
+            "typing",
+            "warnings",
+        ])
@@ -6317,6 +6317,15 @@ def test_collect_parameters(self):
             typing._collect_parameters
         self.assertEqual(cm.filename, __file__)
 
+    def test_lazy_import(self):
+        import_helper.ensure_lazy_imports("typing", [
+            "warnings",
+            "inspect",
+            "re",
+            "contextlib",
+            # "annotationlib",  # TODO
+        ])
+
 
 @lru_cache()
 def cached_func(x, y):