1 files changed, 20 insertions, 0 deletions
diff --git a/Lib/test/test_shlex.py b/Lib/test/test_shlex.py
index fd35788..a432610 100644
--- a/Lib/test/test_shlex.py
+++ b/Lib/test/test_shlex.py
@@ -308,6 +308,26 @@ class ShlexTest(unittest.TestCase):
             self.assertEqual(shlex.quote("test%s'name'" % u),
                              "'test%s'\"'\"'name'\"'\"''" % u)
 
+    def testJoin(self):
+        for split_command, command in [
+            (['a ', 'b'], "'a ' b"),
+            (['a', ' b'], "a ' b'"),
+            (['a', ' ', 'b'], "a ' ' b"),
+            (['"a', 'b"'], '\'"a\' \'b"\''),
+        ]:
+            with self.subTest(command=command):
+                joined = shlex.join(split_command)
+                self.assertEqual(joined, command)
+
+    def testJoinRoundtrip(self):
+        all_data = self.data + self.posix_data
+        for command, *split_command in all_data:
+            with self.subTest(command=command):
+                joined = shlex.join(split_command)
+                resplit = shlex.split(joined)
+                self.assertEqual(split_command, resplit)
+
+
 # Allow this test to be used with old shlex.py
 if not getattr(shlex, "split", None):
     for methname in dir(ShlexTest):