Assertion { public static void nonPositive(long number, String name) { if (number > 0) { throw new InvalidArgumentException(name + " should be non-positive"); } }  static void notNull(T argument, String format, Object... args); static void notNullOrEmpty(String argument, String name); static void negative(long number, String name); static void positive(long number, String name); static void nonNegative(long number, String name); static void nonPositive(long number, String name);  }
@Test(expected = InvalidArgumentException.class) public void nonPositive_withPositive() throws Exception { Assertion.nonPositive(1, "number"); }
@Test public void nonPositive_ok() throws Exception { Assertion.nonPositive(0, "number"); Assertion.nonPositive(-1, "number"); }