diff --git a/poky/bitbake/lib/bb/tests/compression.py b/poky/bitbake/lib/bb/tests/compression.py
index d3ddf67..95af3f9 100644
--- a/poky/bitbake/lib/bb/tests/compression.py
+++ b/poky/bitbake/lib/bb/tests/compression.py
@@ -1,4 +1,6 @@
 #
+# Copyright BitBake Contributors
+#
 # SPDX-License-Identifier: GPL-2.0-only
 #
 
diff --git a/poky/bitbake/lib/bb/tests/cooker.py b/poky/bitbake/lib/bb/tests/cooker.py
index c82d4b7..9e524ae 100644
--- a/poky/bitbake/lib/bb/tests/cooker.py
+++ b/poky/bitbake/lib/bb/tests/cooker.py
@@ -1,6 +1,8 @@
 #
 # BitBake Tests for cooker.py
 #
+# Copyright BitBake Contributors
+#
 # SPDX-License-Identifier: GPL-2.0-only
 #
 
diff --git a/poky/bitbake/lib/bb/tests/fetch.py b/poky/bitbake/lib/bb/tests/fetch.py
index 7fcf57e..b4ed691 100644
--- a/poky/bitbake/lib/bb/tests/fetch.py
+++ b/poky/bitbake/lib/bb/tests/fetch.py
@@ -11,6 +11,7 @@
 import tempfile
 import collections
 import os
+import signal
 import tarfile
 from bb.fetch2 import URI
 from bb.fetch2 import FetchMethod
@@ -22,6 +23,24 @@
         return unittest.skip("network test")
     return lambda f: f
 
+class TestTimeout(Exception):
+    pass
+
+class Timeout():
+
+    def __init__(self, seconds):
+        self.seconds = seconds
+
+    def handle_timeout(self, signum, frame):
+        raise TestTimeout("Test failed: timeout reached")
+
+    def __enter__(self):
+        signal.signal(signal.SIGALRM, self.handle_timeout)
+        signal.alarm(self.seconds)
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        signal.alarm(0)
+
 class URITest(unittest.TestCase):
     test_uris = {
         "http://www.google.com/index.html" : {
@@ -1172,6 +1191,15 @@
         self.assertTrue(os.path.exists(os.path.join(repo_path, 'edgelet/hsm-sys/azure-iot-hsm-c/deps/utpm/deps/c-utility/testtools/umock-c/deps/ctest/README.md')), msg='Missing submodule checkout')
         self.assertTrue(os.path.exists(os.path.join(repo_path, 'edgelet/hsm-sys/azure-iot-hsm-c/deps/utpm/deps/c-utility/testtools/umock-c/deps/testrunner/readme.md')), msg='Missing submodule checkout')
 
+    @skipIfNoNetwork()
+    def test_git_submodule_reference_to_parent(self):
+        self.recipe_url = "gitsm://github.com/gflags/gflags.git;protocol=https;branch=master"
+        self.d.setVar("SRCREV", "14e1138441bbbb584160cb1c0a0426ec1bac35f1")
+        with Timeout(60):
+            fetcher = bb.fetch.Fetch([self.recipe_url], self.d)
+            with self.assertRaises(bb.fetch2.FetchError):
+                fetcher.download()
+
 class SVNTest(FetcherTest):
     def skipIfNoSvn():
         import shutil
diff --git a/poky/bitbake/lib/bb/tests/parse.py b/poky/bitbake/lib/bb/tests/parse.py
index 1a3b749..ee7f253 100644
--- a/poky/bitbake/lib/bb/tests/parse.py
+++ b/poky/bitbake/lib/bb/tests/parse.py
@@ -164,6 +164,7 @@
     # become unset/disappear.
     #
     def test_parse_classextend_contamination(self):
+        self.d.setVar("__bbclasstype", "recipe")
         cls = self.parsehelper(self.classextend_bbclass, suffix=".bbclass")
         #clsname = os.path.basename(cls.name).replace(".bbclass", "")
         self.classextend = self.classextend.replace("###CLASS###", cls.name)