From 0a20b16545ec47600cc8c987c71300bd28d45fa2 Mon Sep 17 00:00:00 2001
From: Windson yang <wiwindson@outlook.com>
Date: Thu, 18 Apr 2019 10:36:11 +0800
Subject: [PATCH 1/2] bpo-14817: add tests to extend_path

---
 Lib/test/test_pkgutil.py | 55 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/Lib/test/test_pkgutil.py b/Lib/test/test_pkgutil.py
index 2887ce6cc055da..7dc1f76ab881b4 100644
--- a/Lib/test/test_pkgutil.py
+++ b/Lib/test/test_pkgutil.py
@@ -357,6 +357,61 @@ def test_mixed_namespace(self):
     # XXX: test .pkg files
 
 
+class ExtendPathBaseTests(unittest.TestCase):
+    def test_input_type_invalid(self):
+        # path should be list instead of string
+        path = 'path'
+        name = 'foo'
+        self.assertEqual('path', pkgutil.extend_path(path, name))
+
+    def test_parent_package_raise_key_error(self):
+        path = ['path']
+        # sys.modules['foo'] raise KeyError
+        name = 'foo.bar'
+        self.assertEqual(['path'], pkgutil.extend_path(path, name))
+
+    def test_parent_package_raise_attr_error(self):
+        path = ['path']
+        # module 'datetime' has no attribute '__path__'
+        name = 'datetime.date'
+        self.assertEqual(['path'], pkgutil.extend_path(path, name))
+
+    def test_extend_path_files(self):
+        # create foo/bar.py
+        self.dirname = tempfile.mkdtemp()
+        sys.path.insert(0, self.dirname)
+        package_name = "foo"
+        package_path = os.path.join(self.dirname, package_name)
+        os.mkdir(package_path)
+        f = open(os.path.join(package_path, 'bar.py'), "w")
+        f.close()
+        # Search valid or invalid module
+        import foo
+        path = [foo.__path__]
+        name = 'foo'
+        self.assertEqual([path[0], package_path], pkgutil.extend_path(path, name))
+        name = 'other'
+        self.assertEqual(path, pkgutil.extend_path(path, name))
+        del sys.path[0]
+
+    def test_extend_pkg_files(self):
+        self.dirname = tempfile.mkdtemp()
+        sys.path.insert(0, self.dirname)
+        package_name = "foo"
+        package_path = os.path.join(self.dirname, package_name)
+        sys.path.insert(1, package_path)
+        os.mkdir(package_path)
+        f = open(os.path.join(package_path, 'bar.pkg'), "w")
+        f.write('foo\nbar\n#other\n')
+        f.close()
+        # Search valid or invalid module
+        import foo
+        path = [foo.__path__]
+        self.assertEqual([path[0], 'foo', 'bar'], pkgutil.extend_path(path, 'bar'))
+        del sys.path[0]
+        del sys.path[1]
+
+
 class NestedNamespacePackageTest(unittest.TestCase):
 
     def setUp(self):

From 61d3986bbee9037be330d3f9f8dd91c86e1aa959 Mon Sep 17 00:00:00 2001
From: Oleg Iarygin <oleg@arhadthedev.net>
Date: Sun, 5 Feb 2023 22:16:42 +0400
Subject: [PATCH 2/2] Add the news entry

---
 .../next/Tests/2023-02-05-22-16-29.gh-issue-59022.dTHNJi.rst     | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Tests/2023-02-05-22-16-29.gh-issue-59022.dTHNJi.rst

diff --git a/Misc/NEWS.d/next/Tests/2023-02-05-22-16-29.gh-issue-59022.dTHNJi.rst b/Misc/NEWS.d/next/Tests/2023-02-05-22-16-29.gh-issue-59022.dTHNJi.rst
new file mode 100644
index 00000000000000..4432cf5ba35eb5
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2023-02-05-22-16-29.gh-issue-59022.dTHNJi.rst
@@ -0,0 +1 @@
+Add tests for :class:`pkgutil.extend_path`. Patch by Windson Yang.