TST: import workaround for older pyvo versions

Author: bsipocz

astroquery/alma/tests/test_alma_remote.py

@@ -10,7 +10,11 @@
 from astropy import units as u
 import numpy as np
 import pytest
-from pyvo.dal.exceptions import DALOverflowWarning
+try:
+    # This requires pyvo 1.4
+    from pyvo.dal.exceptions import DALOverflowWarning
+except ImportError:
+    pass
 
 from astroquery.exceptions import CorruptDataWarning
 from astroquery.utils.commons import ASTROPY_LT_4_1
@@ -49,6 +53,7 @@ def alma(request):
 @pytest.mark.remote_data
 class TestAlma:
     def test_public(self, alma):
+        # This warning was added in pyvo 1.4, but we don't test older versions with remote-data
         with pytest.warns(expected_warning=DALOverflowWarning,
                           match="Partial result set. Potential causes MAXREC, async storage space, etc."):
             results = alma.query(payload=None, public=True, maxrec=100)
@@ -84,6 +89,7 @@ def test_freq(self, alma):
     def test_bands(self, alma):
         payload = {'band_list': ['5', '7']}
         # Added maxrec here as downloading and reading the results take too long.
+        # This warning was added in pyvo 1.4, but we don't test older versions with remote-data
         with pytest.warns(expected_warning=DALOverflowWarning,
                           match="Partial result set. Potential causes MAXREC, async storage space, etc."):
             result = alma.query(payload, maxrec=1000)