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doc: improve fs.truncate functions' documentation #7648

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test: make sure over truncation of file zero fills
thefourtheye Aug 27, 2016
7c20ba9
doc: improve fs.truncate functions' documentation
thefourtheye Aug 27, 2016
d0b96ec
doc: review comments
thefourtheye Aug 27, 2016
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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 zeroes. These tests ensure the same.
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@thefourtheye
thefourtheye committed Aug 27, 2016
commit 2e54b5aa928e3b228f3026c2df6a9b05b8ca2e7f
40 changes: 40 additions & 0 deletions test/parallel/test-fs-truncate.js
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Expand Up @@ -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')));
}));
}