bitbake: lib/bb/tests/fetch: add a test case to ensure git shallow fetch works for tag containing slash

Add a test case to ensure git shallow fetch succeeds for SRC_URI
with tag containing slash.

For example, we want to succeed for SRC_URI like below:
SRC_URI = "git://salsa.debian.org/debian/debianutils.git;protocol=https;branch=master;tag=debian/${PV}"

See the following link for more information:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=15862

(Bitbake rev: 919d4cf6e688e67229c46d30c84d523b21936377)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/tests/fetch.py

@@ -2281,6 +2281,19 @@ class GitShallowTest(FetcherTest):
         self.assertRevCount(1)
         assert os.path.exists(os.path.join(self.gitdir, '.git', 'shallow'))
 
+    def test_shallow_succeeds_with_tag_containing_slash(self):
+        self.add_empty_file('a')
+        self.add_empty_file('b')
+        self.git('tag t1/t2/t3', cwd=self.srcdir)
+        self.assertRevCount(2, cwd=self.srcdir)
+
+        srcrev = self.git('rev-parse HEAD', cwd=self.srcdir).strip()
+        self.d.setVar('SRCREV', srcrev)
+        uri = self.d.getVar('SRC_URI').split()[0]
+        uri = '%s;tag=t1/t2/t3' % uri
+        self.fetch_shallow(uri)
+        self.assertRevCount(1)
+
 class GitLfsTest(FetcherTest):
     def skipIfNoGitLFS():
         if not shutil.which('git-lfs'):