.

wcfs/wcfs_test.py

@@ -39,7 +39,7 @@ from golang import go, chan, select, func, defer
 from golang import context, sync, time
 from golang.gcompat import qq
 from zodbtools.util import ashex as h, fromhex
-from pytest import raises
+from pytest import raises, mark
 from six import reraise
 from .internal import mm
 from .internal.wcfs_test import read_nogil, install_sigbus_trap, fadvise_dontneed
@@ -1265,6 +1265,24 @@ def test_wcfs_basic():
     f.assertCache([1,1,1,1,1,1])
 
 
+# verify how wcfs processes ZODB invalidations when hole becomes a block with data.
+# XXX currently fails (needs δbtree)
+# TODO merge into test_wcfs_basic & watch tests after δbtree is done
+@mark.xfail
+@func
+def test_wcfs_basic_hole2zblk():
+    t = tDB(); zf = t.zfile
+    defer(t.close)
+
+    f = t.open(zf)
+    t.commit(zf, {2:'c1'})  # b & a are holes
+    f.assertCache([0,0,0])
+    f.assertData(['','','c1'])
+
+    t.commit(zf, {1:'b2'})  # hole -> zblk
+    f.assertCache([1,0,1])
+    f.assertData(['','b2','c1'])
+
 # verify that watch setup is robust to client errors/misbehaviour.
 @func
 def test_wcfs_watch_robust():