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test: make sure over truncation of file zero fills

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If the file is over truncated, then the rest of the file should be
filled with null bytes. These tests ensure the same.

PR-URL: https://github.com/nodejs/node/pull/7648
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
This commit is contained in:
Sakthipriyan Vairamani 2016-08-27 15:51:52 +05:30
parent df4880de55
commit 82c7a9c40c
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1 changed files with 40 additions and 0 deletions
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40
test/parallel/test-fs-truncate.js
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@ -106,3 +106,43 @@ function testFtruncate(cb) {
});
});
}
// Make sure if the size of the file is smaller than the length then it is
// filled with zeroes.
{
const file1 = path.resolve(tmp, 'truncate-file-1.txt');
fs.writeFileSync(file1, 'Hi');
fs.truncateSync(file1, 4);
assert(fs.readFileSync(file1).equals(Buffer.from('Hi\u0000\u0000')));
}
{
const file2 = path.resolve(tmp, 'truncate-file-2.txt');
fs.writeFileSync(file2, 'Hi');
const fd = fs.openSync(file2, 'r+');
process.on('exit', () => fs.closeSync(fd));
fs.ftruncateSync(fd, 4);
assert(fs.readFileSync(file2).equals(Buffer.from('Hi\u0000\u0000')));
}
{
const file3 = path.resolve(tmp, 'truncate-file-3.txt');
fs.writeFileSync(file3, 'Hi');
fs.truncate(file3, 4, common.mustCall(function(err) {
assert.ifError(err);
assert(fs.readFileSync(file3).equals(Buffer.from('Hi\u0000\u0000')));
}));
}
{
const file4 = path.resolve(tmp, 'truncate-file-4.txt');
fs.writeFileSync(file4, 'Hi');
const fd = fs.openSync(file4, 'r+');
process.on('exit', () => fs.closeSync(fd));
fs.ftruncate(fd, 4, common.mustCall(function(err) {
assert.ifError(err);
assert(fs.readFileSync(file4).equals(Buffer.from('Hi\u0000\u0000')));
}));
}