### Question:
Args { public static <T> T notNull(final T argument, final String name) { if (argument == null) { throw NullPointerException(name); } return argument; } 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);  }### Answer:
@Test public void testArgNotNullPass() { final String stuff = "stuff"; Assert.assertSame(stuff, Args.notNull(stuff, "Stuff")); }
@Test(expected=NullPointerException.class) public void testArgNotNullFail() { Args.notNull(null, "Stuff"); }