#10166: rewrite self-recursion to iteration in pstats.Stats.add(). Also add a unittest and a stats test file.

Lib/test/test_pstats.py

@@ -1,5 +1,6 @@
 import unittest
 from test import support
+from io import StringIO
 import pstats
 
 
@@ -8,8 +9,8 @@ class AddCallersTestCase(unittest.TestCase):
     """Tests for pstats.add_callers helper."""
 
     def test_combine_results(self):
-        """pstats.add_callers should combine the call results of both target
-        and source by adding the call time. See issue1269."""
+        # pstats.add_callers should combine the call results of both target
+        # and source by adding the call time. See issue1269.
         # new format: used by the cProfile module
         target = {"a": (1, 2, 3, 4)}
         source = {"a": (1, 2, 3, 4), "b": (5, 6, 7, 8)}
@@ -22,9 +23,21 @@ class AddCallersTestCase(unittest.TestCase):
         self.assertEqual(new_callers, {'a': 2, 'b': 5})
 
 
+class StatsTestCase(unittest.TestCase):
+    def setUp(self):
+        stats_file = support.findfile('pstats.pck')
+        self.stats = pstats.Stats(stats_file)
+
+    def test_add(self):
+        stream = StringIO()
+        stats = pstats.Stats(stream=stream)
+        stats.add(self.stats, self.stats)
+
+
 def test_main():
     support.run_unittest(
-        AddCallersTestCase
+        AddCallersTestCase,
+        StatsTestCase,
     )