JUnit(Java)でJavaScriptをテストする。 ref: http://qiita.com/ukiuni@github/items/b16f9d0f2062f59e5f7b

scriptToBeTested.js

function plus(x, y) {
    return x+y;
}

TestCaseのメソッド抜粋

    @Test
    public void testPlus() throws ScriptException, IOException {
        ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");
        FileReader reader = new FileReader("WebContent/js/scriptTobeTested.js");
        engine.eval(reader);
        Assert.assertEquals(true, engine.eval("plus(1, 1) == 2"));
        reader.close();
    }