fix test; disable CounterGather trial

Author: ctb

src/sourmash/index/__init__.py

@@ -311,7 +311,7 @@ def counter_gather(self, query, threshold_bp, **kwargs):
         with query.update() as prefetch_query:
             prefetch_query.minhash = prefetch_query.minhash.flatten()
 
-        if 0: # @CTB
+        if 1: # @CTB
             # find all matches and construct a CounterGather object.
             counter = CounterGather(prefetch_query)
             for result in self.prefetch(prefetch_query, threshold_bp, **kwargs):

tests/test_revindex.py

@@ -43,7 +43,8 @@ def test_revindex_empty():
     ss2 = load_one_signature_from_json(sig2, ksize=31)
     lidx = RevIndex(template=ss2.minhash)
 
-    x = list(lidx.signatures())
+    with pytest.raises(ValueError):
+        x = list(lidx.signatures())
 
 
 def test_revindex_index_search():