Bind xdgmime in SugarExt

And use it in the sugar3.mime modules. This allows
to get rid of the pygtk generated sugarbase module,
along with the wrapping code.

Also add more cases to test_time to make sure
everything is still working.

tests/data/mime.svg

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" version="2.0">
+</svg>

tests/test_mime.py

@@ -17,12 +17,27 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
+import os
 import unittest
 
-from sugar import mime
+from sugar3 import mime
 
+tests_dir = os.path.dirname(__file__)
+data_dir = os.path.join(tests_dir, "data")
 
 class TestMime(unittest.TestCase):
+    def test_split_uri_list(self):
+        self.assertSequenceEqual(mime.split_uri_list("http://one\nhttp://two"),
+                                 ("http://one", "http://two"))
+
+    def test_get_mime_parents(self):
+        self.assertListEqual(mime.get_mime_parents("image/svg+xml"),
+                             ["application/xml"])
+
+    def test_get_for_file(self):
+        self.assertEqual(mime.get_for_file(os.path.join(data_dir, "mime.svg")),
+                         'image/svg+xml')
+
     def test_from_file_name(self):
         self.assertEqual(mime.get_from_file_name('test.pdf'),
                          'application/pdf')
@@ -77,7 +92,3 @@ class TestMime(unittest.TestCase):
                  'text/plain;charset=utf-8', 'text/plain;charset=UTF-8',
                  'text/plain'])
         self.assertEqual(mime_type, 'text/plain')
-
-
-if __name__ == '__main__':
-    unittest.main()