Add tests for SimbadClass.query_region_async

The new tests reveal a problem when radius is passed as a `str` and
multiple coordinates are specified.

Author: eerovaher

astroquery/simbad/tests/test_simbad.py

@@ -243,6 +243,7 @@ def test_query_catalog(patch_post):
                           (FK4_COORDS, '5d0m0s', 2000.0, 'J2000'),
                           (FK5_COORDS, None, 2000.0, 'J2000'),
                           (multicoords, 0.5*u.arcsec, 2000.0, 'J2000'),
+                          (multicoords, "0.5s", 2000.0, 'J2000'),
                           ])
 def test_query_region_async(patch_post, coordinates, radius, equinox, epoch):
     response1 = simbad.core.Simbad.query_region_async(

astroquery/simbad/tests/test_simbad_remote.py

@@ -107,10 +107,11 @@ def test_query_region_async(self, temp_dir):
 
         assert response is not None
 
-    def test_query_region_async_vector(self, temp_dir):
+    @pytest.mark.parametrize("radius", (0.5 * u.arcsec, "0.5s"))
+    def test_query_region_async_vector(self, temp_dir, radius):
         simbad = Simbad()
         simbad.cache_location = temp_dir
-        response1 = simbad.query_region_async(multicoords, radius=0.5*u.arcsec)
+        response1 = simbad.query_region_async(multicoords, radius=radius)
         assert response1.request.body == 'script=votable+%7Bmain_id%2Ccoordinates%7D%0Avotable+open%0Aquery+coo+5%3A35%3A17.3+-80%3A52%3A00+radius%3D0.5s+frame%3DICRS+equi%3D2000.0%0Aquery+coo+17%3A47%3A20.4+-28%3A23%3A07.008+radius%3D0.5s+frame%3DICRS+equi%3D2000.0%0Avotable+close'   # noqa
 
     def test_query_region(self, temp_dir):