add a remote test for findcatalog respecting ucd keywords

Author: keflavich

astroquery/vizier/tests/test_vizier_remote.py

@@ -125,3 +125,13 @@ def test_findcatalog_maxcatalog(self):
         # assert str(exc.value)==("Maximum number of catalogs exceeded."
         #                        "  Try setting max_catalogs "
         #                        "to a large number and try again")
+
+    def test_findcatalog_ucd(self):
+        V = vizier.core.Vizier()
+        ucdresult = V(ucd='time.age*').find_catalogs('eclipsing binary', max_catalogs=5000)
+        result = V.find_catalogs('eclipsing binary', max_catalogs=5000)
+
+        assert len(ucdresult) >= 12 # count as of 1/15/2018
+        assert len(result) >= 628
+        # important part: we're testing that UCD is parsed and some catalogs are ruled out
+        assert len(ucdresult) < len(result)