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test: getgroups() may contain duplicate GIDs
Some systems may have multiple group names with the same group ID, in
which case getgroups() returns duplicate values, where `id -G` will
filter the duplicates. Unique and sort the arrays so they can be
compared.

PR-URL: #10389
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
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sam-github committed Apr 17, 2017
commit cc1d02d2f7ce4f295bfe3b835d161a363f09d9db
18 changes: 12 additions & 6 deletions test/parallel/test-process-getgroups.js
Original file line number Diff line number Diff line change
@@ -1,21 +1,23 @@
'use strict';
const common = require('../common');
const assert = require('assert');
const exec = require('child_process').exec;

// Check `id -G` and `process.getgroups()` return same groups.

if (common.isOSX) {
common.skip('Output of `id -G` is unreliable on Darwin.');
return;
}
const assert = require('assert');
const exec = require('child_process').exec;

if (typeof process.getgroups === 'function') {
const groups = process.getgroups();
const groups = unique(process.getgroups());
assert(Array.isArray(groups));
assert(groups.length > 0);
exec('id -G', function(err, stdout) {
if (err) throw err;
const real_groups = stdout.match(/\d+/g).map(Number);
assert.strictEqual(groups.length, real_groups.length);
assert.ifError(err);
const real_groups = unique(stdout.match(/\d+/g).map(Number));
assert.deepStrictEqual(groups, real_groups);
check(groups, real_groups);
check(real_groups, groups);
});
Expand All @@ -24,3 +26,7 @@ if (typeof process.getgroups === 'function') {
function check(a, b) {
for (let i = 0; i < a.length; ++i) assert.notStrictEqual(b.indexOf(a[i]), -1);
}

function unique(groups) {
return [...new Set(groups)].sort();
}