Reinventing shouldFail() part1

gistfile1.groovy

import groovy.util.GroovyTestCase

public class Test extends GroovyTestCase {

    private shouldError(Closure c) {
        try {
            c.call()
            assert false // Failure
        } catch (Error expected) {
            assert true //Successful
        }
    }

    private shouldException(Closure c) {
        try {
            c.call()
            assert false // Failure
        } catch (Exception expected) {
            assert true //Successful
        }
    }

    public void test() {
        shouldError { throw new IllegalAccessError() }
        shouldException { throw new NullPointerException() }
    }
}