fix a regression test that had been skipped and add some essential

imports in vizier remote testing

Author: keflavich

astroquery/vizier/tests/test_vizier_remote.py

@@ -1,7 +1,8 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 
-from astropy.tests.helper import remote_data
+from astropy.tests.helper import remote_data,pytest
 import astropy.units as u
+from astropy import coordinates
 from ... import vizier
 from ...utils import commons
 import requests
@@ -59,8 +60,8 @@ def test_query_two_wavelengths(self):
                                column_filters={"Vmag":">10"}, keywords=["optical", "radio"])
         v.query_object('M 31')
 
-    def regressiontest_invalidtable(self):
-        V = Vizier(columns=['all'], ucd='(spect.dopplerVeloc*|phys.veloc*)',
+    def test_regressiontest_invalidtable(self):
+        V = vizier.core.Vizier(columns=['all'], ucd='(spect.dopplerVeloc*|phys.veloc*)',
                    keywords=['Radio', 'IR'], row_limit=5000)
         C = coordinates.SkyCoord(359.61687 * u.deg, -0.242457 * u.deg, frame='galactic')
 
@@ -81,12 +82,12 @@ def test_multicoord(self):
         assert result['I/239/hip_main']['HIP'] == 98298
 
     def test_findcatalog_maxcatalog(self):
-        V = Vizier()
-        cats = Vizier.find_catalogs('eclipsing binary', max_catalogs=5000)
+        V = vizier.core.Vizier()
+        cats = V.find_catalogs('eclipsing binary', max_catalogs=5000)
         assert len(cats) >= 468
 
         with pytest.raises(ValueError) as exc:
-            Vizier.find_catalogs('eclipsing binary')
+            V.find_catalogs('eclipsing binary')
         assert str(exc.value)==("Maximum number of catalogs exceeded."
                                 "  Try setting max_catalogs "
                                 "to a large number and try again")