fixed doc string and added additional assertins in test

Author: syed-gilani

astroquery/mast/missions.py

@@ -72,7 +72,7 @@ def query_region_async(self, coordinates, radius=3*u.arcmin, **kwargs):
             Default 3 degrees.
             The string must be parsable by `~astropy.coordinates.Angle`. The
             appropriate `~astropy.units.Quantity` object from
-            `~astropy.units` may also be used. Defaults to 0.2 deg.
+            `~astropy.units` may also be used. Defaults to 3 arcminutes.
         **kwargs
             Other mission-specific keyword args.
             These can be found at the following link
@@ -108,7 +108,7 @@ def query_region_async(self, coordinates, radius=3*u.arcmin, **kwargs):
     @class_or_instance
     def query_criteria_async(self, **criteria):
         """
-        Given an set of filters, returns a list of catalog entries.
+        Given a set of search criteria, returns a list of mission metadata.
 
         Parameters
         ----------
@@ -168,7 +168,7 @@ def query_object_async(self, objectname, radius=3*u.arcmin, **kwargs):
             Default 3 arcmin.
             The string must be parsable by `~astropy.coordinates.Angle`.
             The appropriate `~astropy.units.Quantity` object from
-            `~astropy.units` may also be used. Defaults to 0.2 deg.
+            `~astropy.units` may also be used. Defaults to 3 arcminutes.
         **kwargs
             Mission-specific keyword args.
             These can be found in the `service documentation <https://mast.stsci.edu/api/v0/_services.html>`__.

astroquery/mast/tests/test_mast.py

@@ -192,11 +192,13 @@ def test_missions_query_object_async(patch_post):
 def test_missions_query_object(patch_post):
     result = mast.MastMissions.query_object("M101", radius=".002 deg")
     assert isinstance(result, Table)
+    assert len(result) > 0
 
 
 def test_missions_query_region(patch_post):
     result = mast.MastMissions.query_region(regionCoords, radius=0.002 * u.deg)
     assert isinstance(result, Table)
+    assert len(result) > 0
 
 
 def test_missions_query_criteria_async(patch_post):