[_v_m_t_x_test] add test for vmtx table (simply inherits from hmtx one)

Lib/fontTools/ttLib/tables/_v_m_t_x_test.py

@@ -0,0 +1,18 @@
+from __future__ import print_function, division, absolute_import
+from __future__ import unicode_literals
+from fontTools.misc.py23 import *
+from fontTools.ttLib.tables._v_m_t_x import table__v_m_t_x
+from fontTools.ttLib.tables import _h_m_t_x_test
+import unittest
+
+
+class VmtxTableTest(_h_m_t_x_test.HmtxTableTest):
+
+    @classmethod
+    def setUpClass(cls):
+        cls.tableClass = table__v_m_t_x
+        cls.tag = "vmtx"
+
+
+if __name__ == "__main__":
+    unittest.main()