Test harness for dynamically loading modules

ContainerTest.java

public class ContainerTest
{
    @Test
    public void testDefaultClassLoader() throws Exception
    {
        test(new IClassLoaderFactory()
        {
            public ClassLoader factory() throws MalformedURLException
            {
                // load classes using the default delegation strategy
                return new URLClassLoader(buildClassPath());
            }
        });
    }

    protected void test(IClassLoaderFactory factory) throws Exception
    {
        String moduleClass = getModuleClass();
        IContainer container = buildContainer();

        System.gc();
        long memStart = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

        for (int i=0; i<100; i++)
        {
            ClassLoader moduleLoader = factory.factory();

            // load the module
            container.loadModule(moduleLoader, moduleClass);

            // now free the module
            container.clearModules();
            System.gc();
        }

        System.gc();
        long memEnd = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
        long kbLeaked = memEnd > memStart ? (memEnd - memStart) >> 10 : 0;
        System.out.println("Leaked " + kbLeaked + "KB");
        assertTrue(kbLeaked < 10);
    }
}