SwingJS-Examples is the test project that Bob Hanson uses for all official testing of SwingJS, always with the latest version of SwingJS-site.zip and net.sf.j2s.core.jar You can unzip dist/site.zip to test SwingJS on your machine locally. Just unzip the file and open one of the many html files in the site/ directory. Or you can check out the project and do your own tests. By extending test.Test_., all Test_Foo classes automatically enable assert(), which is used extensively. For developers who want to create their own tests: The swingjs/ directory holds four files: net.sf.j2s.core.jar SwingjS-site.zip build-site.xml timestamp net.sf.j2s.core.jar is the Java2Script transpiler as an Eclipse plugin. The transpiler needs to be put in the Eclipse dropins directory. If you already have one there, you should run Eclipse with the -clean flag so that it resets its plugin information from the new version. It is purposely left without versioning because we had problems with Eclipse not updating if a file with a new name was put in, and it makes the update simpler. SwingJS-site.zip holds the core JavaScript for SwingJS; basically the Java JVM in JavaScript. build-site.xml is a simple ANT task that just unzips SwingJS-site.zip into your site/ directory. timestamp is a one-line file that gives the latest date of the transpiler or runtime.