Index: frontend/node_modules/commondir/test/dirs.js
===================================================================
--- frontend/node_modules/commondir/test/dirs.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/commondir/test/dirs.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,55 @@
+var test = require('tape');
+var commondir = require('../');
+
+test('common', function (t) {
+    t.equal(
+        commondir([ '/foo', '//foo/bar', '/foo//bar/baz' ]),
+        '/foo'
+    );
+    t.equal(
+        commondir([ '/a/b/c', '/a/b', '/a/b/c/d/e' ]),
+        '/a/b'
+    );
+    t.equal(
+        commondir([ '/x/y/z/w', '/xy/z', '/x/y/z' ]),
+        '/'
+    );
+    t.equal(
+        commondir([ 'X:\\foo', 'X:\\\\foo\\bar', 'X://foo/bar/baz' ]),
+        'X:/foo'
+    );
+    t.equal(
+        commondir([ 'X:\\a\\b\\c', 'X:\\a\\b', 'X:\\a\\b\\c\\d\\e' ]),
+        'X:/a/b'
+    );
+    t.equal(
+        commondir([ 'X:\\x\\y\\z\\w', '\\\\xy\\z', '\\x\\y\\z' ]),
+        '/'
+    );
+    t.throws(function () {
+        commondir([ '/x/y/z/w', 'qrs', '/x/y/z' ]);
+    });
+    t.end();
+});
+
+test('base', function (t) {
+    t.equal(
+        commondir('/foo/bar', [ 'baz', './quux', '../bar/bazzy' ]),
+        '/foo/bar'
+    );
+    t.equal(
+        commondir('/a/b', [ 'c', '../b/.', '../../a/b/e' ]),
+        '/a/b'
+    );
+    t.equal(
+        commondir('/a/b/c', [ '..', '../d', '../../a/z/e' ]),
+        '/a'
+    );
+    t.equal(
+        commondir('/foo/bar', [ 'baz', '.\\quux', '..\\bar\\bazzy' ]),
+        '/foo/bar'
+    );
+    // Tests including X:\ basedirs must wait until path.resolve supports
+    // Windows-style paths, starting in Node.js v0.5.X
+    t.end();
+});