.

wcfs/wcfs_test.py

@@ -1248,10 +1248,6 @@ def test_wcfs_basic():
     f.assertCache([0,0,0])  # initially not cached
     f.assertData (['','','c1'], mtime=t.head)
 
-    # read after file size returns (0, ok)
-    # (the same behaviour as on e.g. ext4 and as requested by posix)
-    assert 0 == io.readat(f.f.fileno(), 100*blksize, bytearray(10))
-
     # >>> (@at2) commit again -> we can see both latest and snapshotted states
     # NOTE blocks d(4) and f(5) will be accessed only in the end
     at2 = t.commit(zf, {2:'c2', 3:'d2', 5:'f2'})
@@ -1326,6 +1322,24 @@ def test_wcfs_basic_hole2zblk():
 # XXX ZBlk copied from blk1 -> blk2 ; for the same file and for file1 -> file2  (δbtree)
 # XXX ZBlk moved  from blk1 -> blk2 ; for the same file and for file1 -> file2  (δbtree)
 
+# verify that read after file size returns (0, ok)
+# (the same behaviour as on e.g. ext4 and as requested by posix)
+@func
+def test_wcfs_basic_read_aftertail():
+    t = tDB(); zf = t.zfile
+    defer(t.close)
+
+    t.commit(zf, {2:'c1'}
+    f = t.open(zf)
+    f.assertData(['','','c1'])
+
+    assert 10 == io.readat(f.f.fileno(),   0*blksize, bytearray(10))
+    assert 10 == io.readat(f.f.fileno(),   1*blksize, bytearray(10))
+    assert 10 == io.readat(f.f.fileno(),   2*blksize, bytearray(10))
+    assert  0 == io.readat(f.f.fileno(),   3*blksize, bytearray(10))
+    assert  0 == io.readat(f.f.fileno(), 100*blksize, bytearray(10))
+
+
 # verify that watch setup is robust to client errors/misbehaviour.
 @func
 def test_wcfs_watch_robust():