test-ancestor: test iteration for lazyancestors

This has some test coverage in test-revlog-ancestry.py, but not very much.

tests/test-ancestor.py

@@ -77,7 +77,8 b' def genlazyancestors(revs, stoprev=0, in'
                                   inclusive=inclusive)
 
 def printlazyancestors(s, l):
-    print [n for n in l if n in s]
+    print 'membership: %r' % [n for n in l if n in s]
+    print 'iteration:  %r' % list(s)
 
 def test_lazyancestors():
     # Empty revs

tests/test-ancestor.py.out

@@ -35,14 +35,20 b''
 % ancestors of [13] and not of [10, 11, 12]
 [8, 13]
 % lazy ancestor set for [], stoprev = 0, inclusive = False
-[]
+membership: []
+iteration:  []
 % lazy ancestor set for [11, 13], stoprev = 0, inclusive = False
-[7, 8, 3, 4, 1, 0]
+membership: [7, 8, 3, 4, 1, 0]
+iteration:  [3, 7, 8, 1, 4, 0, 2]
 % lazy ancestor set for [1, 3], stoprev = 0, inclusive = False
-[1, 0]
+membership: [1, 0]
+iteration:  [0, 1]
 % lazy ancestor set for [11, 13], stoprev = 0, inclusive = True
-[11, 13, 7, 8, 3, 4, 1, 0]
+membership: [11, 13, 7, 8, 3, 4, 1, 0]
+iteration:  [11, 13, 3, 7, 8, 1, 4, 0, 2]
 % lazy ancestor set for [11, 13], stoprev = 6, inclusive = False
-[7, 8]
+membership: [7, 8]
+iteration:  [7, 8]
 % lazy ancestor set for [11, 13], stoprev = 6, inclusive = True
-[11, 13, 7, 8]
+membership: [11, 13, 7, 8]
+iteration:  [11, 13, 7, 8]