$ brew search js-test-driver
js-test-driver
$ brew install js-test-driver
Warning: You have Xcode 4.2.1, which is outdated.
Please install Xcode 4.3.
==> Downloading https://js-test-driver.googlecode.com/files/JsTestDriver-1.3.4.b.jar
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/usr/local/Cellar/js-test-driver/1.3.4.b: 3 files, 4.1M, built in 6 seconds