Formatter { public static String toUpperCase(String source) { return source.toUpperCase(); } private  Formatter(); static String toUpperCase(String source); static String toLowerCase(String source); static String toCamelCase(String source); static String toUnderscoreCase(String source); static String toPascalCase(String source);  }
@Test public void testToUpperCase() throws Exception { assertEquals("SOME_FOO", Formatter.toUpperCase("some_foo")); }