added test for vml_get_mode/svml_set_mode roundtrip, issue/8

Author: oleksandr-pavlyk

mkl/_mkl_service.pyx

@@ -850,6 +850,7 @@ cdef object __vml_set_mode(accuracy, ftzdaz, errmode):
             'ftzdaz': {
                 'on': mkl.VML_FTZDAZ_ON,
                 'off': mkl.VML_FTZDAZ_OFF,
+		'default': 0,
             },
             'errmode': {
                 'ignore': mkl.VML_ERRMODE_IGNORE,

tests/test_mkl_service.py

@@ -287,6 +287,10 @@ def test_set_mpi_msmpi(self):
 
 class test_vm_service_functions():
     # https://software.intel.com/en-us/mkl-developer-reference-c-vm-service-functions
+    def test_vml_set_get_mode_roundtrip(self):
+        saved = mkl.vml_get_mode()
+        mkl.vml_set_mode(*saved) # should not raise errors
+
     def test_vml_set_mode_ha_on_ignore(self):
         mkl.vml_set_mode('ha', 'on', 'ignore')