Args { public static void check(final boolean expression, final String message) { if (!expression) { throw new IllegalArgumentException(message); } } private  Args(); static void check(final boolean expression, final String message); static void check(final boolean expression, final String message, final Object... args); static void check(final boolean expression, final String message, final Object arg); static long checkContentLength(final EntityDetails entityDetails); static int checkRange(final int value, final int lowInclusive, final int highInclusive,
                    final String message); static long checkRange(final long value, final long lowInclusive, final long highInclusive,
                    final String message); static T containsNoBlanks(final T argument, final String name); static T notBlank(final T argument, final String name); static T notEmpty(final T argument, final String name); static T notEmpty(final T argument, final String name); static int notNegative(final int n, final String name); static long notNegative(final long n, final String name); static T notNull(final T argument, final String name); static int positive(final int n, final String name); static long positive(final long n, final String name); static T positive(final T timeValue, final String name);  }
@Test public void testArgCheckPass() { Args.check(true, "All is well"); }
@Test(expected=IllegalArgumentException.class) public void testArgCheckFail() { Args.check(false, "Oopsie"); }