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A few days ago a test was added here to ensure that creating an mmap

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with a size larger than the underlying file worked on Windows.  It
does <wink>.  However, merely creating an mmap that way has the side
effect of growing the file on disk to match the specified size.  A
*later* test assumed that the file on disk was still exactly as it was
before the new "size too big" test was added, but that's no longer true.
So added a hack at the end of the "size too big" test to truncate the
disk file back to its original size on Windows.
This commit is contained in:
Tim Peters 2002-09-10 20:49:15 +00:00
parent a0d1833639
commit 4f4f4d70af
1 changed files with 15 additions and 4 deletions
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19
Lib/test/test_mmap.py
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@ -102,7 +102,7 @@ def test_both():
# Try resizing map
print ' Attempting resize()'
try:
m.resize( 512 )
m.resize(512)
except SystemError:
# resize() not supported
# No messages are printed, since the output of this test suite
@ -196,14 +196,22 @@ def test_both():
m = mmap.mmap(f.fileno(), mapsize+1)
except ValueError:
# we do not expect a ValueError on Windows
# CAUTION: This also changes the size of the file on disk, and
# later tests assume that the length hasn't changed. We need to
# repair that.
if sys.platform.startswith('win'):
verify(0, "Opening mmap with size+1 should work on Windows.")
else:
# we expect a ValueError on Unix, but not on Windows
if not sys.platform.startswith('win'):
verify(0, "Opening mmap with size+1 should raise ValueError.")
del m
del f
m.close()
f.close()
if sys.platform.startswith('win'):
# Repair damage from the resizing test.
f = open(TESTFN, 'r+b')
f.truncate(mapsize)
f.close()
print " Opening mmap with access=ACCESS_WRITE"
f = open(TESTFN, "r+b")
@ -214,7 +222,10 @@ def test_both():
"Write-through memory map memory not updated properly.")
m.flush()
del m, f
verify(open(TESTFN).read() == 'c'*mapsize,
f = open(TESTFN, 'rb')
stuff = f.read()
f.close()
verify(open(TESTFN, 'rb').read() == 'c'*mapsize,
"Write-through memory map data file not updated properly.")
print " Opening mmap with access=ACCESS_COPY"