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Improved fuzz test to find an actual code bug (previous bug was in the test

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This commit is contained in:
Matthew Bloch
2012-06-07 02:06:08 +01:00
parent 9fc3c061f8
commit 08f3d42b34
2 changed files with 20 additions and 10 deletions
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17
tests/fuzz
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@@ -22,7 +22,7 @@ end
testname_local = "#{$0}.test.#{$$}.local"
testname_serve = "#{$0}.test.#{$$}.serve"
[testname_local, testname_serve].each do |name|
File.open(name, "w+") { |fh| fh.seek(test_size-1, IO::SEEK_SET); fh.write("0") }
File.open(name, "w+") { |fh| fh.seek(test_size-1, IO::SEEK_SET); fh.write("\0") }
end
@local = File.open(testname_local, "r+")
@@ -55,15 +55,22 @@ repetitions.times do |n|
length &= 0xfffff000 if CHEAT_AND_ROUND_DOWN
offset = rand(test_size - length)
offset &= 0xfffff000 if CHEAT_AND_ROUND_DOWN
content = (n%2 == 1) ? ("x" * length) : ("\0" * length)
content = (n%2 == 0) ? ("\0" * length) : ( ((n/2)&255).chr * length)
@local.seek(offset, IO::SEEK_SET)
@local.write(content)
@local.fsync
@serve.write(offset, content)
if @serve.read(offset, length) != content
STDERR.print "After pass #{n}: Didn't read back what we wrote!"
check_read = @serve.read(offset, length)
if check_read != content
STDERR.print "After pass #{n}: Didn't read back what we wrote!\n"
STDERR.print "*** We wrote these #{content.length} bytes...\n"
IO.popen("hexdump", "w") { |io| io.print(content) }
STDERR.print "*** But we got back these #{check_read.length} bytes...\n"
IO.popen("hexdump", "w") { |io| io.print(check_read) }
exit 1
end