The tests are built on QUnit. To run the suite, just open test_suite.html in a web browser. There is also test_suite_kws.html for the keyword spotting functionality. qunit is included, there is no need to install it. Meanwhile, it assumes pocketsphinx.js is in a ../build folder. It only tests pocketsphinx.js for now.
You can for instance start a small web server with python -m SimpleHTTPServer in the base directory and open http://localhost:8000/tests/test_suite.html in your browser.
In addition, there is a test suite for the pocketsphinx_zh.js file which is built with a Chinese acoustic model. Open http://localhost:8000/tests/test_suite_zh.html in your browser.