PreferencesFeature prefs = PreferencesProvider.get();
JsArrayString arr = JsArrayString.createArray().cast();
arr.push("foo");
arr.push("bar");
arr.push("baz");
prefs.setArray("arrayVal", arr);
JsArrayString found = prefs.getArray("arrayVal");
assertEquals("arrayVal.length", 3, found.length());
assertEquals("arrayVal[0]", "foo", found.get(0));
assertEquals("arrayVal[1]", "bar", found.get(1));