I'm using Sencha Cmd v3.0.0.250 on OS X.

When I run sencha app build testing the output says:

PHP Code:
Processed local file app.js
Minified app
According to the docs, build testing should not minify any javascript file:

testing - intended for QA prior to production. All JavaScript and CSS source files are bundled, but not minified, which makes it easier to debug.
Is this a bug?