Add tests for gihub repository using fake hub command

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/tests/data/hub

+#!/bin/sh
+
+# Fake hub implementation for use in testsuite
+
+case "$1" in
+    pull-request) exit 0;;
+    fork) exit 0;;
+esac
+
+git "$@"

weblate/trans/tests/test_vcs.py

@@ -20,7 +20,8 @@
 
 from weblate.trans.tests.test_models import RepoTestCase
 from weblate.trans.vcs import GitRepository, HgRepository, \
-    RepositoryException, GitWithGerritRepository
+    RepositoryException, GitWithGerritRepository, GithubRepository
+from weblate.trans.tests.utils import get_test_file
 
 from django.test import TestCase
 import tempfile
@@ -29,6 +30,12 @@ import os.path
 import datetime
 
 
+class GithubFakeRepository(GithubRepository):
+    _is_supported = None
+    _version = None
+    _cmd = get_test_file('hub')
+
+
 class GitTestRepository(GitRepository):
     _is_supported = None
     _version = None
@@ -299,6 +306,12 @@ class VCSGerritTest(VCSGitTest):
     _branch = 'master'
 
 
+class VCSGithubTest(VCSGitTest):
+    _class = GithubFakeRepository
+    _vcs = 'git'
+    _branch = 'master'
+
+
 class VCSHgTest(VCSGitTest):
     """
     Mercurial repository testing.