Test the open of non-exitent tarfile in all modes.
diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
index 238175f..18dd390 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -232,6 +232,12 @@
         finally:
             tar.close()
 
+    def test_non_existent_tarfile(self):
+        # Test for issue11513: prevent non-existent gzipped tarfiles raising
+        # multiple exceptions.
+        with self.assertRaisesRegex(FileNotFoundError, "xxx"):
+            tarfile.open("xxx", self.mode)
+
     def test_null_tarfile(self):
         # Test for issue6123: Allow opening empty archives.
         # This test guarantees that tarfile.open() does not treat an empty
@@ -444,11 +450,7 @@
     test_fail_comp = None
 
 class GzipMiscReadTest(GzipTest, MiscReadTestBase, unittest.TestCase):
-    def test_non_existent_targz_file(self):
-        # Test for issue11513: prevent non-existent gzipped tarfiles raising
-        # multiple exceptions.
-        with self.assertRaisesRegex(FileNotFoundError, "xxx"):
-            tarfile.open("xxx", self.mode)
+    pass
 
 class Bz2MiscReadTest(Bz2Test, MiscReadTestBase, unittest.TestCase):
     def test_no_name_argument(self):