.

wcfs/wcfs_test.py

@@ -1329,15 +1329,29 @@ def test_wcfs_basic_read_aftertail():
     t = tDB(); zf = t.zfile
     defer(t.close)
 
-    t.commit(zf, {2:'c1'}
+    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))
+    def _(off): # -> bytes read from f[off +4)
+        buf = bytearray(4)
+        n = io.readat(f.f.fileno(), off, buf)
+        return bytes(buf[:n])
+
+    assert _(0*blksize)     == b'\x00\x00\x00\x00'
+    assert _(1*blksize)     == b'\x00\x00\x00\x00'
+    assert _(2*blksize)     == b'c1\x00\x00'
+    assert _(3*blksize-4)   == b'\x00\x00\x00\x00'
+    assert _(3*blksize-3)   == b'\x00\x00\x00'
+    assert _(3*blksize-2)   == b'\x00\x00'
+    assert _(3*blksize-1)   == b'\x00'
+    assert _(3*blksize-0)   == b''
+    assert _(3*blksize+1)   == b''
+    assert _(3*blksize+2)   == b''
+    assert _(3*blksize+3)   == b''
+    assert _(4*blksize)     == b''
+    assert _(8*blksize)     == b''
+    assert _(100*blksize)   == b''
 
 
 # verify that watch setup is robust to client errors/misbehaviour.