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test: make sure over truncation of file zero fills

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: #7648
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
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thefourtheye authored and Fishrock123 committed Aug 27, 2016
1 parent d565183 commit d2179bd6f104911e9ead0121d7423b0f3b3a6536
Showing with 40 additions and 0 deletions.
  1. +40 −0 test/parallel/test-fs-truncate.js
@@ -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')));
}));
}

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