1 files changed, 56 insertions, 0 deletions
diff --git a/fastimport/tests/test_helpers.py b/fastimport/tests/test_helpers.py
new file mode 100644
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+++ b/fastimport/tests/test_helpers.py
@@ -0,0 +1,56 @@
+# Copyright (C) 2009 Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+"""Test the helper functions."""
+
+import testtools
+
+from fastimport import (
+    helpers,
+    )
+
+
+class TestCommonDirectory(testtools.TestCase):
+
+    def test_no_paths(self):
+        c = helpers.common_directory(None)
+        self.assertEqual(c, None)
+        c = helpers.common_directory([])
+        self.assertEqual(c, None)
+
+    def test_one_path(self):
+        c = helpers.common_directory(['foo'])
+        self.assertEqual(c, '')
+        c = helpers.common_directory(['foo/'])
+        self.assertEqual(c, 'foo/')
+        c = helpers.common_directory(['foo/bar'])
+        self.assertEqual(c, 'foo/')
+
+    def test_two_paths(self):
+        c = helpers.common_directory(['foo', 'bar'])
+        self.assertEqual(c, '')
+        c = helpers.common_directory(['foo/', 'bar'])
+        self.assertEqual(c, '')
+        c = helpers.common_directory(['foo/', 'foo/bar'])
+        self.assertEqual(c, 'foo/')
+        c = helpers.common_directory(['foo/bar/x', 'foo/bar/y'])
+        self.assertEqual(c, 'foo/bar/')
+        c = helpers.common_directory(['foo/bar/aa_x', 'foo/bar/aa_y'])
+        self.assertEqual(c, 'foo/bar/')
+
+    def test_lots_of_paths(self):
+        c = helpers.common_directory(['foo/bar/x', 'foo/bar/y', 'foo/bar/z'])
+        self.assertEqual(c, 'foo/bar/')