Include unit tests.

test/chmod.js

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+var shell = require('..');
+
+var assert = require('assert'),
+    path = require('path'),
+    fs = require('fs');
+
+shell.config.silent = true;
+
+//
+// Invalids
+//
+
+shell.chmod('blah');  // missing args
+assert.ok(shell.error());
+shell.chmod('893', 'resources/chmod');  // invalid permissions - mode must be in octal
+assert.ok(shell.error());
+
+//
+// Valids
+//
+
+// Test files - the bitmasking is to ignore the upper bits.
+shell.chmod('755', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('755', 8));
+shell.chmod('644', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('644', 8));
+
+shell.chmod('o+x', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('645', 8));
+shell.chmod('644', 'resources/chmod/file1');
+
+shell.chmod('+x', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('755', 8));
+shell.chmod('644', 'resources/chmod/file1');
+
+// Test setuid
+shell.chmod('u+s', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('4000', 8), parseInt('4000', 8));
+shell.chmod('u-s', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('644', 8));
+
+// according to POSIX standards at http://linux.die.net/man/1/chmod,
+// setuid is never cleared from a directory unless explicitly asked for.
+shell.chmod('u+s', 'resources/chmod/c');
+shell.chmod('755', 'resources/chmod/c');
+assert.equal(fs.statSync('resources/chmod/c').mode & parseInt('4000', 8), parseInt('4000', 8));
+shell.chmod('u-s', 'resources/chmod/c');
+
+// Test setgid
+shell.chmod('g+s', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('2000', 8), parseInt('2000', 8));
+shell.chmod('g-s', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('644', 8));
+
+// Test sticky bit
+shell.chmod('+t', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('1000', 8), parseInt('1000', 8));
+shell.chmod('-t', 'resources/chmod/file1');
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('777', 8), parseInt('644', 8));
+assert.equal(fs.statSync('resources/chmod/file1').mode & parseInt('1000', 8), 0);
+
+// Test directories
+shell.chmod('a-w', 'resources/chmod/b/a/b');
+assert.equal(fs.statSync('resources/chmod/b/a/b').mode & parseInt('777', 8), parseInt('555', 8));
+shell.chmod('755', 'resources/chmod/b/a/b');
+
+// Test recursion
+shell.chmod('-R', 'a+w', 'resources/chmod/b');
+assert.equal(fs.statSync('resources/chmod/b/a/b').mode & parseInt('777', 8), parseInt('777', 8));
+shell.chmod('-R', '755', 'resources/chmod/b');
+assert.equal(fs.statSync('resources/chmod/b/a/b').mode & parseInt('777', 8), parseInt('755', 8));
+
+// Test symbolic links w/ recursion  - WARNING: *nix only
+fs.symlinkSync('resources/chmod/b/a', 'resources/chmod/a/b/c/link', 'dir');
+shell.chmod('-R', 'u-w', 'resources/chmod/a/b');
+assert.equal(fs.statSync('resources/chmod/a/b/c').mode & parseInt('777', 8), parseInt('555', 8));
+assert.equal(fs.statSync('resources/chmod/b/a').mode & parseInt('777', 8), parseInt('755', 8));
+shell.chmod('-R', 'u+w', 'resources/chmod/a/b');
+fs.unlinkSync('resources/chmod/a/b/c/link');
+
+shell.exit(123);

test/resources/chmod/file1

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+this is test file 1
+default state should be 0644 (rw-r--r--)