diff --git a/tests/test_plugin_run.py b/tests/test_plugin_run.py
index 3cdb3522b085d5de944871a045f331d66097f6e4..957e280a653e5ddf745c72f76b8e5539c6588338 100644
--- a/tests/test_plugin_run.py
+++ b/tests/test_plugin_run.py
@@ -23,22 +23,25 @@ from conservancy_beancount import plugin
 CONFIG_MAP = {}
 
 class TransactionCounter:
-    HOOK_GROUPS = frozenset(['Transaction'])
-
-    def __init__(self):
-        self.counter = 0
+    HOOK_GROUPS = frozenset(['Transaction', 'counter'])
 
     def run(self, txn):
-        self.counter += 1
-        return ()
+        return ['txn:{}'.format(id(txn))]
 
 
 class PostingCounter(TransactionCounter):
-    HOOK_GROUPS = frozenset(['Posting'])
+    HOOK_GROUPS = frozenset(['Posting', 'counter'])
 
     def run(self, txn, post):
-        return super().run(txn)
+        return ['post:{}'.format(id(post))]
+
 
+def map_errors(errors):
+    retval = {}
+    for errkey in errors:
+        key, _, errid = errkey.partition(':')
+        retval.setdefault(key, set()).add(errid)
+    return retval
 
 def test_with_multiple_hooks():
     txn_counter = TransactionCounter()
@@ -55,9 +58,9 @@ def test_with_multiple_hooks():
     ]
     out_entries, errors = plugin.run(in_entries, CONFIG_MAP, [txn_counter, post_counter])
     assert len(out_entries) == 2
-    assert len(errors) == 0
-    assert txn_counter.counter == 2
-    assert post_counter.counter == 4
+    errmap = map_errors(errors)
+    assert len(errmap.get('txn', '')) == 2
+    assert len(errmap.get('post', '')) == 4
 
 def test_with_posting_hooks_only():
     post_counter = PostingCounter()
@@ -73,5 +76,6 @@ def test_with_posting_hooks_only():
     ]
     out_entries, errors = plugin.run(in_entries, CONFIG_MAP, [post_counter])
     assert len(out_entries) == 2
-    assert len(errors) == 0
-    assert post_counter.counter == 4
+    errmap = map_errors(errors)
+    assert len(errmap.get('txn', '')) == 0
+    assert len(errmap.get('post', '')) == 4