### Question:
JsdUtil { static String toClassName(final String name) { return toIdentifier(name, true); } private  JsdUtil();   }### Answer:
@Test public void testToClassName() { assertEquals("_$", JsdUtil.toClassName("")); assertEquals("HelloWorld", JsdUtil.toClassName("helloWorld")); assertEquals("2helloWorld", JsdUtil.toClassName("2helloWorld")); }