return cache[path]
        }

        if (!slices) {
            // path/to/a.js
            // ['path', 'to', 'a.js']
            slices = path.split(SLASH)
        }

        slices.pop()

        // If the path has no parent directory, just test it
        if (!slices.length) {
            return cache[path] = this._testOne(path, checkUnignored)
        }

        const parent = this._t(