TST: adding test for list_collections

Author: bsipocz

astroquery/ipac/irsa/tests/test_irsa_remote.py

@@ -71,6 +71,14 @@ def test_list_catalogs(self):
         # (at the time of writing there are 933 tables in the list).
         assert len(catalogs) > 900
 
+    def test_list_collections(self):
+        collections = Irsa.list_collections()
+        # Number of available collections may change over time, test only for significant drop.
+        # (at the time of writing there are 110 collections in the list).
+        assert len(collections) > 100
+        assert 'spitzer_seip' in collections['collection']
+        assert 'wise_allwise' in collections['collection']
+
     def test_tap(self):
         query = "SELECT TOP 5 ra,dec FROM cosmos2015"
         with pytest.warns(expected_warning=DALOverflowWarning,